Potato Pests and Diseases: Real Problems, Real Fixes

Growing potatoes can be exciting. You plant a few chunks of spud in the ground, water them, and wait. Then, boom. You imagine a harvest full of golden tubers. But what happens when you pull up a potato and it looks like a crime scene? Holes, rot, weird spots not exactly appetizing. That, my friend, is the work of pests and diseases. The management of potato pests and diseases is crucial for successful potato cultivation. Potatoes are one of the most versatile crops.

This isn’t some textbook breakdown. Let’s walk through the messes, the fixes, and the lessons – like one grower to another.

Let’s Start with the Critters: Common Potato Pests

1. Colorado Potato Beetle (Leptinotarsa decemlineata)

A Farmer’s Guide to Colorado Potato Beetle

If you’ve ever walked through your potato patch, all proud of those leafy green rows, only to notice some fat orange bugs chomping away like they own the place… chances are, you’ve met the Colorado Potato Beetle.

You’re not alone. This pest is the most stubborn, destructive, and downright annoying visitor a potato grower can get. Let’s take a closer look—not with jargon, but with stories, practical tips, and a few battle scars.

What’s the Deal with This Beetle?

The Colorado Potato Beetle (Leptinotarsa decemlineata) isn’t from Colorado originally. It started off munching wild plants in North America and eventually found its way into cultivated potato fields—and then, well, it never looked back.

It’s now found across North America, Europe, Asia, and yes, even parts of Bangladesh in recent years, especially in cooler northern districts during winter potato seasons.

What Do They Look Like?

• Adults: Bright yellowish orange with ten black stripes running down their back. Kinda pretty… until they destroy your crop.

• Larvae: Fat, reddish orange grubs with black spots on the sides. They eat even more than the adults.

Real Life Story: How One Farmer Fought Back

In 2022, I visited Zakir Bhai in a small village outside Bogura. His potatoes were growing beautifully… until one day he noticed holes in the leaves. Within a week, entire plants were skeletons.

He thought it was some kind of disease at first, but then spotted the striped beetles—hundreds of them. “মনে হচ্ছিল, কেউ আমার জমিতে আগুন লাগিয়ে দিছে।” (“It felt like someone set fire to my field,” he said.)

That season, he lost almost 40% of his crop. But he didn’t give up. The next year, he came back with a plan.

What Do They Do to Your Crop?

They’re leaf eaters—plain and simple.

• Both adults and larvae feed on leaves.
• If left alone, they can defoliate an entire field.
• Without leaves, the plant can’t make energy, and your tubers stay tiny and underdeveloped.

One research study from the Bangladesh Agricultural Research Institute (BARI) showed that untreated infestations can reduce potato yield by up to 80%, especially in smallholder plots where early detection is difficult.

How to Spot the Problem Early

Check undersides of leaves — that’s where they lay eggs bright orange clusters.
Look for holes or thinning leaves — the feeding starts small.
Watch for reddish larvae — they usually show up before adults multiply.

If you spot one or two, chances are more are on the way.

How to Control Colorado Potato Beetles

Here’s what Zakir Bhai and many others now do.

1. Handpicking

Yeah, it sounds old school. But in small plots, it works. Every morning, Mamun and his nephew go row by row with a tin can and soapy water. They drop the bugs in. Dead beetles, no chemicals.

2. Crop Rotation

This is huge. Don’t plant potatoes in the same spot two years in a row. The beetles lay eggs in the soil, and when the new season starts, boom they’re back.

Plant a non host crop like beans or mustard instead. Research from Cornell University found this practice alone reduced beetle population by 50% over two seasons.

3. Mulching Early

Covering soil with straw mulch early in the season confuses beetles looking for potato fields. Plus, it keeps soil cool and moist.

4. Neem Spray

Mamun uses a homemade spray with neem leaf extract and a little dish soap. It won’t kill adult beetles right away, but it stops larvae from growing and slows them down. Best if used every 7–10 days.

5. Biologicals: Bacillus thuringiensis (Bt)

Bt is a natural bacterium that only harms specific pests. Spray it when larvae are small. According to a BARI field trial in 2021, Bt reduced beetle larvae by 70% within two weeks—without harming bees or beneficial insects.

6. Resistant Varieties

Some varieties are tougher. BARI recommended ‘Cardinal’ and ‘Asterix’ as being more tolerant in trials done in Nilphamari and Rangpur. These don’t stop beetles from coming, but plants bounce back faster.

What Not to Do

Don’t overuse pesticides. The beetle is famous for becoming resistant. In fact, it’s developed resistance to more than 50 insecticides globally.
Don’t ignore early infestations. A few beetles can lay hundreds of eggs. One week of delay = disaster.

Urban Gardeners: This Affects You Too

Even rooftop growers in Dhaka aren’t safe. Shilpy Apa once had a full sack of potatoes attacked. “I didn’t think bugs could climb five floors,” she laughed. Now she uses row covers during the first few weeks those thin white nets that keep pests out while letting sunlight through.

And yes, she still handpicks. “I do it with music in my earphones,” she says.

Summary: Your Beetle Battle Plan

Method	Best For	Cost	Notes
Handpicking	Small plots	Free	Works best early in season
Crop rotation	All farms	Free	Reduces long term population
Neem spray	Organic growers	Low	Natural and safe
Bt (Bacillus)	Larvae control	Medium	Apply early, avoid sun exposure
Resistant varieties	Prevention	Same cost	Ask local agri office or BARI dealer
Straw mulch	Confusion + coverage	Low	Also good for soil health

Final Words from Zakir Bhai

“আগে আমি পোকা দেখলে ভয় পেতাম। এখন দেখি, আমি আগে দেখলে ওরা ভয় পায়।”

(“Before, I used to be scared of pests. Now, if I see them first they’re the ones that should be scared.”)

It’s all about observation, patience, and the right tools. Colorado Potato Beetles are no joke, but they’re also not unbeatable.

References

• Shilpy Apa – Rooftop Grower, Dhaka, Shared Her Experience via WhatsApp, 2024
• Bangladesh Agricultural Research Institute (BARI) – Field Trials on Colorado Beetle Control, 2021-2023
• Cornell University IPM Center – “Managing Colorado Potato Beetle Resistance,” 2022
• CABI Invasive Species Compendium – Colorado Potato Beetle Profile, 2023
• Zakir Bhai – Farmer, Bogura District, Interviewed 2022

2. Aphids in Potato Farming: Tiny Bugs, Big Trouble but You Can Handle Them

Ever walked into your potato field one morning and noticed the leaves looking curled, yellowish, and not quite right? Maybe you rubbed a leaf and felt it sticky? That, my friend, might just be the work of aphids—tiny sap suckers with a taste for your hard work.

Don’t worry. You’re not the only one. Farmers from Rangpur to Rajshahi in Bangladesh deal with this every season. The good news? Aphids are annoying, yes—but beatable.

What Are Aphids ?

Aphids are soft, tiny insects usually green or black , that hang out on the undersides of leaves. You’ll see them clustered together, sucking juice from the plant like little vampires.

In potatoes, the main troublemakers are:

• Green Peach Aphid (Myzus persicae)

• Potato Aphid (Macrosiphum euphorbiae)

They don’t bite humans. But they do suck the life out of your potato plants. And worse—they spread viruses like Potato Virus Y (PVY), which silently cuts your yield without you even realizing it.

Meet the Victims: A True Story from Munshiganj

Last year (2024), Sufia Apa, a small scale farmer in Munshiganj, was proud of her potato field. “The leaves were like green carpets,” she told me. But by mid January, she noticed strange yellowing on some plants. Then curling leaves. Then stunted growth.

She sprayed a general pesticide, but nothing changed.

Turns out, it was aphids, and they had already transmitted PVY. She lost almost 30% of her crop, even though the plants looked okay from far.

Now, she checks her field twice a week—leaf by leaf—and uses a mix of natural methods to keep things under control.

Signs of Aphid Trouble

• Leaves curling or turning yellow
• Sticky, shiny stuff on leaves called honeydew
• Ants crawling around
• Visible tiny green or black bugs in clusters

And the real danger? Even if the damage looks small, the viruses they carry can’t be reversed once transmitted.

How to Control Aphids

Let’s keep it real. You don’t need fancy chemicals or machines. Here’s what works in real fields, not just textbooks.

1. Use Natural Predators

Aphids are weak against:

• Ladybugs – Eat dozens of aphids a day
• Lacewings – Their larvae are tiny aphid hunters
• Parasitic wasps – Lay eggs inside aphids, which sounds harsh… but hey, it works

Tip: Plant some marigold, coriander, or mustard flowers around your potato field. These attract helpful bugs that naturally eat aphids.

Research says: According to a 2022 study by the International Potato Center (CIP), fields with flowering border crops had 40% fewer aphids and better yields.

Neem Spray – Cheap and Safe

Sufia Apa swears by neem leaf extract mixed with a little soap. She sprays it in the early morning or just before sunset.

How to Make It:

• Soak crushed neem leaves overnight
• Add a few drops of dish soap
• Spray it directly on the affected parts

Neem disrupts aphid reproduction, slows them down, and is safe for good bugs and your soil.

3. Water Blast Simple but Effective

If your plants are still young, just take a water hose and spray the undersides of the leaves. The pressure knocks aphids off.

This won’t kill them, but it will buy you time to apply neem or introduce predators.

4. Yellow Sticky Traps

Aphids are attracted to the color yellow. Place sticky yellow cards in between rows. It’s a great way to monitor their population too.

Sufia made her own by painting plastic sheets yellow and coating them with sticky glue she used the type used for catching flies in homes.

5. Avoid Over Fertilizing with Nitrogen

Too much nitrogen = too many soft, lush leaves = aphid paradise.

Use compost and balance your fertilizers. A study from BARI (2021) showed that balanced nutrients reduced aphid attraction by 25%.

When to Spray

If natural methods aren’t enough, and aphids keep coming back:

• Use insecticidal soap or botanical oils first
• For big outbreaks, Imidacloprid or Acetamiprid may be used carefully—but only in the early season, and never just before harvest
• Always follow local agri office advice before spraying anything

Remember: chemical sprays can kill your helpful insects too.

Prevention Tips: Stay Ahead of Aphids

• Check the field twice a week—especially leaf undersides
• Keep weeds under control—they attract aphids
• Rotate crops each season—don’t grow potatoes in the same spot
• Use virus free, certified seed potatoes
• Start strong: healthy plants resist aphids better

Summary Table: Aphid Control Cheatsheet

Method	Cost	Good For	Pro Tip
Neem leaf spray	Very low	Small medium plots	Add a little soap
Water spray	Free	Early infestations	Aim under the leaves
Natural predators	Free	Long term balance	Plant flowers nearby
Sticky yellow cards	Low	Monitoring & trapping	Hang at plant height
Balanced fertilizing	Medium	Overall resistance	Avoid too much nitrogen

Final Thoughts

Aphids might be tiny, but they teach us something big—you don’t need to be aggressive to do damage.

With patience, a little observation, and the right natural steps, you can keep aphids in check and grow a healthy crop.

As Sufia Apa says:
“আগে আমি কেবল জমি চাষ করতাম, এখন আমি জমি দেখি, শিখি, আর বুঝি।”
(“Before, I just farmed my land. Now I watch, learn, and understand it.”)

That’s the kind of mindset that makes a grower successful , season after season.

References

• University of Minnesota Extension. (2023). Potato Aphid Control in Home Gardens.
• International Potato Center (CIP). (2022). Integrated Pest Management for Potato.
• Bangladesh Agricultural Research Institute (BARI). (2021). Field Trials on Aphid Management in Northern Potato Zones.
• FAO (2020). Managing Insect Borne Viruses in Potato.
• Sufia Khatun – Farmer, Munshiganj (Interviewed January 2023)

3. What’s Ruining My Potatoes? Let’s Talk About Wireworms (Agriotes spp.)

A few years ago, I was standing in my potato field with a heavy heart. After months of hard work, watering, weeding, and watching those green leaves grow strong, I finally started harvesting. But instead of clean, healthy potatoes, I pulled out one after another with tiny holes—some half eaten from the inside.

At first, I thought it was rats or maybe something wrong with the soil. But a visit from the local agriculture officer confirmed it: wireworms.

Since then, I’ve made it a mission to learn more and share what I’ve learned. If you’re growing potatoes—whether in a big field or a backyard—this might help you too.

Meet the Culprit: Wireworms

Wireworms are the young stage of click beetles, and they live in the soil. They’re thin, hard, and kind of shiny—about the size of a matchstick, orangey brown in color. They don’t move fast, but they do chew underground and can quietly destroy a crop without showing signs until harvest.

What’s frustrating is they can stay underground for 2 to 5 years, feeding on roots and tubers before becoming adult beetles.

Why Potatoes?

Potatoes are soft, starchy, and easy to bite into—for pests too. Wireworms tunnel into them, leaving dry brown holes. The worst part? These holes are often deep, not just surface marks.

I’ve found:

• Small plants sometimes wilt without reason .
• Clean looking potatoes may be hollow inside.
• The damage invites rot and fungus too.

A Farmer’s Story: Billal from Rangpur

Let me tell you about Billal Uddin, a potato farmer I met in Rangpur during a field meeting. He’s been growing potatoes on his family land for over 15 years.

In 2021, he faced heavy losses. “The potatoes looked fine on top,” he told me, “but when we packed them for market, many had holes. Traders didn’t want them.”

He later learned that the plot he used had been growing maize the previous year—a crop that wireworms love. That explained everything. The larvae were already there in the soil, waiting.

Why You Might Not Notice Them

The trouble with wireworms is that they don’t cause obvious symptoms above ground—not at first.

But there are clues:

• Seed potatoes fail to sprout or grow poorly
• Random wilting in patches
• When you harvest, you find holes, sometimes with rot

What Science Says

Over the years, researchers have looked into wireworm behavior. A study from Europe (Furlan et al., 2017) found that fields with a cereal or grass history had higher wireworm activity. They also recommend rotating with crops that wireworms don’t like—like mustard or lentils.

There’s also growing interest in biological control. Some fungi like Beauveria bassiana and Metarhizium anisopliae can reduce wireworm populations in soil, according to recent trials (Applied Soil Ecology, 2021). These aren’t instant fixes, but they’re safer than heavy chemical use.

So What Can You Do?

Let’s talk solutions. I’ve learned most of these by talking to farmers, researchers, and through trial and error on my own land.

1. Bait Before You Plant

Before planting potatoes, bury a few pieces of carrot or potato around your field. After 4–5 days, dig them up. If wireworms are inside, you’ll know they’re present.

2. Don’t Plant After Maize or Grass

Wireworms love cereals. If your land was used for corn, wheat, or grassy crops, wait a season or grow a different crop before potatoes.

3. Use Neem Cake or Mustard Cake

In some parts of Bangladesh, farmers mix neem cake with the soil before planting. It doesn’t kill all pests, but it repels many soil insects and improves fertility too.

4. Let the Soil Dry Out

Wireworms prefer moist, cool soil. Plowing in bright sunlight before planting can help bring larvae to the surface where birds and sun can deal with them.

5. Try Marigolds

This might sound funny, but planting marigold flowers around your potato patch can actually help. Their roots release a chemical that repels many underground pests.

How Billal Turned Things Around

After his losses, Billal changed a few things:

• He skipped potatoes the next year and planted lentils.
• He added mustard cake to the soil.
• Before planting potatoes again, he used bait traps to check for wireworms.

His next potato crop was clean. He told me with a grin, “Sometimes you lose money, but gain knowledge. That’s the real harvest.”

Final Thoughts

Wireworms are quiet pests. You can’t see them, but they’re there—chewing away underground while your plants grow above.

You don’t need fancy chemicals or high tech solutions. What you need is awareness, good planning, and a little local wisdom. Talk to other farmers, test your soil, and pay attention to your land’s history.

Your potatoes will thank you.

References

• Farmer Story: Billal Uddin, Rangpur District (Field Visit, 2023)
• Furlan, L. et al. (2017). “Integrated Pest Management of Wireworms: Review of Current Approaches.” Journal of Pest Science.
• Ansari, M.A., & Butt, T.M. (2021). “Biological Control of Wireworms with Fungi.” Applied Soil Ecology.

4. Potato Leafhoppers: The Tiny Pest That Can Wreck a Good Crop

Ever notice your potato plants looking a little… stressed? Like the edges of their leaves are curling up, turning yellow, or getting a burnt look?

That happened to my cousin Murad, a small potato grower in Pabna. Everything looked perfect for the first few weeks—lush green leaves, good growth. Then one morning, he called me in frustration:

“Bhai, the tips of my potato plants are burning—and I didn’t even miss irrigation!”

We went over and took a closer look. And that’s when we found the sneaky culprit: Potato Leafhoppers.

What Are Potato Leafhoppers?

Potato Leafhoppers (Empoasca fabae) are tiny, fast moving green insects. You probably won’t notice them unless you look closely under the leaves. They’re about 3 mm long and love to hop away when disturbed.

But don’t be fooled by their size. They cause serious damage.

These little pests suck sap from the leaves and inject toxic saliva that disrupts plant function. The result? A condition called hopperburn—yellowing leaf edges, curling, and stunted growth.

What Damage Looks Like

If you’re growing potatoes and spot these signs, leafhoppers may be to blame:

• Yellowing or browning leaf tips
• Leaves curling upward
• New growth looking weak or crumpled
• Plants looking stressed even though you watered

In Murad’s case, the newer leaves were curled like dry paper. He thought it was zinc deficiency. That’s a common confusion.

Murad’s Story: A Lesson Learned

Murad grows potatoes on just under an acre. It’s his main winter crop.

In December 2022, his plants were thriving. But by mid January, the damage appeared. He tried adding micronutrients, but nothing helped. When we finally took a magnifying lens and checked under the leaves bam. There they were leafhoppers.

With guidance from the local agri extension officer, he:

• Sprayed neem oil
• Released lacewing larvae
• Started checking leaves every 3 days

Within two weeks, the damage stopped spreading. Yield wasn’t perfect, but far better than what he feared.

What Research Tells Us

Murad’s experience is backed by science.

• According to a study from Cornell University (Lamp et al., 1994), even small leafhopper populations can reduce potato yield by up to 25%.
• Another study in the Journal of Economic Entomology found that hopperburn can start appearing just 3 days after feeding begins.
• Bangladesh Agricultural Research Institute (BARI) recommends early monitoring and using natural enemies like green lacewings and lady beetles for control.

These tiny pests don’t need huge numbers to hurt your crop.

What You Can Do

Here are some field tested tips that farmers like Murad now use:

1. Scout Regularly

Start early. From 2 weeks after planting, check the underside of leaves twice a week. A small hand lens helps.

2. Watch for Early Signs

Don’t wait until the whole plant looks sick. If you see yellow edges and curled tips, take action.

3. Use Neem Spray

A neem oil solution (5 ml per liter) works well against nymphs. Spray early in the morning or late afternoon.

4. Encourage Natural Enemies

Lacewings, ladybugs, and even spiders help control leafhoppers. Don’t spray broad spectrum pesticides unless necessary—they kill the good bugs too.

5. Use Sticky Traps

Yellow sticky traps can catch adult leafhoppers. Place a few around your field edges.

When Are They Most Active?

In Bangladesh and similar regions, leafhoppers show up from mid December to February, when the weather is dry and warm. They prefer new growth so young potato plants are especially vulnerable.

Experience Based Tip

If your plants are young, don’t assume curled leaves mean nutrient deficiency.
Look under the leaves first. That one habit saved Murad a second season of loss.

References

• Lamp, W.O., et al. (1994). “Impact of Potato Leafhoppers on Solanaceous Crops.” Cornell University Extension.
• BARI Field Manual (2020). “Insect Pests in Potato Production.” Bangladesh Agricultural Research Institute.
• Nault, L. R. (1987). “Biology and Ecology of Leafhoppers.” Annual Review of Entomology.
• Murad Hossain, Farmer Interview, Pabna District (2023)

Final Thoughts

Potato leafhoppers might be small, but they move fast and damage quicker than you’d expect. The best thing you can do? Stay observant. Learn what early damage looks like. Act before it spreads.

You don’t need heavy chemicals. With simple natural methods, regular checks, and a little bit of local knowledge, you can protect your crop.

5. Potato Flea Beetles: Small Bugs, Big Trouble for Your Potato Crop

Ever walked into your potato field and noticed your leaves look like someone poked them with a tiny needle? Hundreds of little holes, all over the place? That’s what Monir, a potato farmer from Thakurgaon, saw one morning last winter.

At first, he thought it might be hail damage or maybe some fertilizer issue. But when he looked closer, he saw tiny, shiny black insects jumping away like popcorn. Yep—Potato Flea Beetles.

Let’s talk about these little pests, what they do, and how you can deal with them using simple, practical methods.

What Are Potato Flea Beetles?

Potato flea beetles are tiny, black or brown beetles, usually less than 2 mm long. Don’t let their size fool you—they can do serious damage fast. These beetles jump like fleas when disturbed, which is how they got their name.

They feed on the leaves of potato plants by chewing small, round holes—what experts call “shot hole damage.” The damage may not kill your plants, but it can weaken them, especially when they’re young.

Why They’re a Problem

Here’s what flea beetles can do:

• Stunt your plant’s growth by damaging the leaves .
• Open up the plant to disease, especially bacterial infections through feeding wounds.
• In some cases, they even attack young tubers, leaving scars and reducing market quality.

Monir’s young potato crop looked healthy until about the 4th week. Then the damage appeared overnight. “I thought it was just heat stress or a bad spray,” he said. “But then I saw them—tiny black bugs jumping everywhere.”

What Research Tells Us

• According to the University of Minnesota Extension, flea beetles can reduce potato yield by 20–30% if infestations are severe and early in the season.
• A 2020 study published in Journal of Integrated Pest Management found that early detection and physical barriers like row covers were more effective than late chemical sprays.
• The Bangladesh Agricultural Research Institute (BARI) has identified flea beetles as a rising pest in potato growing zones due to climate change and early winter heat.

Monir’s Story: From Panic to Prevention

After the infestation, Monir consulted the local extension officer. He was advised to:

• Spray neem based solution (neem oil + soap water) twice a week
• Remove weeds especially nightshade family plants that attract flea beetles
• Water the field early in the morning to reduce stress
• Try using yellow sticky traps at field edges to monitor beetle activity

It worked. The beetle population dropped, and his plants bounced back. He lost about 10% of the crop, but that was a relief considering the initial fear.

How to Spot and Manage Potato Flea Beetles

What to Look For:

• Tiny round holes in leaves shot hole damage
• Shiny black or brown beetles jumping when disturbed
• Damaged lower leaves first they usually start at the base

What You Can Do:

1. Use Neem Spray

Neem oil mixed with a bit of soap in water (5 ml neem oil + 1 ml soap per liter) helps deter feeding.

2. Practice Early Monitoring

Inspect plants twice a week in the first 30–40 days. Look under leaves, especially the bottom ones.

3. Try Row Covers

Fine mesh or netting during early plant growth can keep beetles out without chemicals.

4. Encourage Natural Predators

Lady beetles, ground beetles, and birds all feed on flea beetles. Avoid using broad insecticides that wipe them out.

5. Rotate Crops

Don’t plant potatoes or tomatoes, eggplants in the same spot year after year. These crops attract the same pests.

6. Use Sticky Traps

Bright yellow sticky cards placed around the field help monitor and even reduce adult flea beetles.

When Do They Show Up?

Flea beetles become active during early spring or winter, especially when the days are sunny and warm. They love young plants, so your crop is most vulnerable in the first 3–5 weeks.

Final Thoughts

Potato flea beetles are fast, sneaky, and hard to spot—but if you stay alert, you can stop them before they do real damage. Regular field walks, natural sprays like neem, and smart planting practices go a long way.

Take it from Monir. “The first time, I panicked,” he said. “The second time, I was ready. I sprayed early and checked every few days. Hardly lost any plants.”

That’s the power of knowing your land and learning from experience.

References

• Monir Hossain, Thakurgaon, Bangladesh — Interview conducted during field visit, 2023
• University of Minnesota Extension. “Flea Beetles in Potatoes.”
• BARI (Bangladesh Agricultural Research Institute), Field Bulletin on Potato Pests, 2022
• Capinera, J.L. (2020). “Potato Flea Beetles: Biology and Management.” Journal of Integrated Pest Management.

Common Potato Diseases

1. Potato Late Blight (Phytophthora infestans): A Farmer’s Nightmare You Can’t Ignore

I still remember the winter of 2021. My uncle, who’s been growing potatoes for 15 years, stood quietly in his field just after sunrise. The potato plants that looked fine three days ago now had leaves turning brown at the tips, and some stems looked like they were melting. The smell of decay was already in the air.

He didn’t say much at first, but I could tell he was worried.

He didn’t have to say it — we both knew it.
Late blight had arrived.

What Is Late Blight?

Late blight is a plant disease caused by something called Phytophthora infestans. It’s not really a fungus, though it acts like one. It loves cool, moist conditions and can spread shockingly fast, especially during foggy mornings or after light rain.

This is the same disease that caused the Irish potato famine back in the 1800s. People literally starved because of it. That’s how serious it can get.

How to Know It’s Late Blight

Here’s what we saw in the field:

• Leaves had dark brown patches, starting at the edges.
• Some leaves had a gray white fuzz underneath, especially early in the morning.
• Stems were soft and turning dark—almost as if cooked.
• A few tubers dug from the ground already had brown, sunken spots.

If your potato plants look like that during cool, wet weather, chances are you’re dealing with blight.

Real Story: My Uncle’s Field in Trouble

Let me tell you what happened in real time.

My uncle grows potatoes on around 2 acres of land in northern Bangladesh. His crop was doing well until late January, when a week of heavy fog rolled in. He didn’t spray anything because, as he later said, “The plants looked fine. Why waste money?”

That mistake cost him.

Within five days, 30% of his field was hit. He started spraying then, but the disease had already spread. Yield dropped by about 40%, and the tubers he harvested were harder to sell because some had started rotting in storage.

What Science Says

• Late blight spreads through air and water. Spores float in the air and land on wet leaves.
• It loves temperatures between 13°C and 20°C, with high humidity.
• According to BARI (Bangladesh Agricultural Research Institute), late blight is now more common because of changing winter weather—especially long spells of fog and drizzle.
• Spraying after symptoms appear is often too late. Early prevention is key.

What We Did Differently the Next Year

After that bad season, we changed how we approached things.

Here’s what worked for us:

1. Started spraying early, even before symptoms appeared we used a copper based fungicide.
2. Planted in rows with better spacing helped with airflow, so leaves stayed drier.
3. Watered in the morning, never in the evening.
4. Chose blight resistant seeds, like BARI Alu 25.
5. Paid attention to the weather forecast if fog was coming, we didn’t wait.

What You Can Do Practical Tips from Our Field

1. Don’t Wait for Blight to Show Up

If you know your area gets fog or light rain in winter, start preventive spraying as soon as your plants are about 25–30 days old.

2. Use Natural Options Too

We mixed neem extract with water and sprayed that between fungicide rounds. It might not stop blight alone, but it helped reduce stress on the plants.

3. Improve Drainage

We made shallow drainage ditches between beds. If water sits too long, it makes things worse.

4. Watch Your Tubers

Even if the top of the plant looks okay, dig a few test potatoes. If they’re showing brown spots or have a strange smell, act quickly.

Final Words

Late blight is one of those things that sneaks up when everything seems fine. That’s what makes it so dangerous.

My uncle still says, “Blight doesn’t ask permission. It just comes.” But now, he’s ready. The following year, he lost almost no crop.

So here’s the thing, you don’t need to be a scientist to beat late blight. You just need to be alert, act early, and learn from the seasons.

References

• Field observations from winter seasons 2021–2024
• Bangladesh Agricultural Research Institute (BARI) – Farmer’s Guide to Potato Diseases (2022)
• CIMMYT – Practical IPM Tips for South Asian Potato Growers (2019)

2. Potato Early Blight: The Slow Burn That Can Hurt Your Yield

If you’ve ever grown potatoes, you’ve probably had that one moment maybe mid season when your plants look a little… tired. Not completely dead, just struggling. You notice brown spots on the leaves, maybe a little yellowing, but it’s not spreading fast like late blight. Still, something’s not right.

This happened to Ruhul Amin, a potato farmer in Munshiganj. I was visiting his farm last year in early February when he called me over to take a look at his plants.

“They’re not dying fast,” he said, “but they’re definitely not happy.”

And sure enough, the lower leaves had brown, dry looking spots with yellow halos. Ruhul thought it was nutrient stress, but what he had was something much sneakier Early Blight, caused by a fungus called Alternaria solani.

What Exactly Is Early Blight?

Early blight is a common fungal disease of potatoes. Unlike late blight, which hits hard and fast, early blight creeps in slowly. It starts on older, lower leaves and gradually moves up the plant. It doesn’t usually wipe out a crop overnight, but if ignored, it can reduce your yield and tuber quality.

The fungus survives in soil, crop debris, and even on old plant material. It loves warm weather and moisture—especially after light rain or overhead irrigation.

What to Look For

• Dark brown spots on older leaves, often with concentric rings .
• Yellowing around the spots
• Leaves may dry up and fall off
• In serious cases, stems and tubers can also be infected

Ruhul said, “The leaves looked like they had old cigarette burns on them.”

What Research Tells Us

• According to the University of Maine Extension, early blight can cause 20–30% yield loss if not managed properly.
• A 2020 field study from BARI (Bangladesh Agricultural Research Institute) found that early blight was present in over 40% of potato fields surveyed in Rangpur and Munshiganj.
• Alternaria solani spreads faster in fields where crop rotation is not practiced, and plant stress like poor nutrition or lack of water makes it worse.

So yeah, it’s not just “bad luck.” There’s science behind why and when this happens.

Ruhul’s Story: Lessons from the Field

Ruhul has been growing potatoes for nearly 10 years. His plot is about 1.5 acres, and he usually grows Diamant and Cardinal varieties. In 2023, he skipped crop rotation and used the same plot two years in a row.

When early blight showed up, he tried spraying plain water, thinking it was heat stress. Then he tried a foliar fertilizer. But the disease slowly spread.

Eventually, an agri officer suggested a contact fungicide—mancozeb—and to increase spacing between rows for better air movement. Ruhul also added a little compost tea and fish emulsion to give the plants a nutrition boost.

In the end, he still got a harvest—but not as big as usual. The big win? He didn’t let the disease ruin the whole crop.

How You Can Manage Early Blight From a Farmer’s View

Here’s what works, in plain terms:

1. Start Early with Sprays

Don’t wait until the disease shows up. Spray mancozeb or chlorothalonil when your plants are 30–35 days old, especially if there’s been rain or dew.

2. Feed Your Plants Well

Weak plants get sick easier. Use balanced fertilizer, compost, or liquid feed like fish emulsion.

3. Don’t Plant Potatoes in the Same Place Every Year

Rotate with non solanaceous crops like lentils, mustard, or corn.

4. Remove Infected Leaves

If only a few plants are showing symptoms, just remove those lower leaves and dispose of them away from the field.

5. Avoid Overhead Watering

Drip irrigation or watering at the base of the plant helps keep leaves dry.

When Is Early Blight Most Active?

It usually strikes when:

• Temperatures are warm (20–30°C)
• There’s moisture on leaves due to dew, fog, or light rain
• Plants are already stressed due to poor nutrition or drought

So keep an eye out from late January to March in places like Bangladesh.

What Ruhul Says Now

Ruhul still grows potatoes on the same land, but now he rotates crops and uses preventive sprays.

“Before, I used to wait for the problem. Now, I try to stay ahead of it.”

And that’s probably the most honest, down to earth advice any grower can give.

References

1. University of Maine Extension Early Blight in Potatoes and Tomatoes.
2. BARI Report (2021) – Incidence of Alternaria solani in Key Potato Growing Regions of Bangladesh.
3. CIMMYT Farmer Guide – Integrated Disease Management in Solanaceous Crops.
4. Interview with Ruhul Amin, Potato Farmer, Munshiganj, Bangladesh – Field Visit, 2023.

Final Thoughts

Early blight might not sound scary at first it doesn’t kill plants overnight like late bligh but over time, it wears your crop down. It’s like a slow leak in a tyre. Ignore it, and you’ll be limping toward harvest.

But the good news is it’s manageable.

With a little planning, early action, and a few farmer tested tricks, you can keep your crop healthy and your harvest strong.

3. Potato Scab (Streptomyces scabies) : When Your Tubers Look Sick, But They’re Not

Potato Scab: When Your Tubers Look Sick, But They’re Not

A few years ago, my neighbor Rahim Bhai harvested what he thought was going to be his best potato crop yet. Big, healthy looking plants, just the right amount of rain, and no sign of disease during the growing season.

But when he dug them up, his smile faded. The potatoes were covered in rough, brown patches and scab like lesions.

“I thought maybe they were burnt by fertilizer,” he told me.
“But no. The market buyer took one look and cut the price in half.”

What he had was a common problem Potato Scab, caused by a soil dwelling bacterium called Streptomyces scabies.

What is Potato Scab?

Potato scab is a cosmetic disease — meaning it doesn’t usually affect the inside of the tuber or the plant’s growth much. But it makes the skin look ugly with brown, corky lesions. And sadly, ugly potatoes don’t sell well, even if they’re perfectly edible.

The culprit, Streptomyces scabies, is a bacterium that lives in the soil. It thrives in dry, alkaline conditions — and once it’s there, it’s tough to get rid of.

How to Recognize Potato Scab

Here’s what to look for when you dig up your potatoes:

• Brown, rough spots that feel like sandpaper
• Pitted or raised lesions on the tuber skin
• Sometimes, deep holes or cracks in severe cases
• The rest of the potato looks and tastes fine — it’s just the skin that’s affected

Rahim Bhai thought it might be a fungal problem or fertilizer burn, but the key was in the texture — dry, rough, and corky lesions mostly near the surface.

What Research Says

• According to a study published by Michigan State University Extension, scab is more likely to develop when soil pH is above 5.5, and especially above 6.0.
• The bacterium prefers warm, dry soil conditions — which is why potato scab is more common in upland fields with less moisture.
• In a 2020 BARI field trial, plots treated with acidic organic matter (like decomposed pine needles or composted manure) had up to 50% less scab.

So yes — soil health and pH really matter here.

Real Story: What Rahim Bhai Did Next

The year after his scab heavy harvest, Rahim decided to change a few things:

• Tested his soil pH it came out around 6.8
• He added organic sulfur and composted cow dung, which helped reduce the pH slightly
• He also irrigated more often during tuber formation, because scab likes dry soil
• Most importantly, he planted a resistant variety — BARI Alu-25

That season, his scab problem was cut in half, and he was back to getting a good price at the market.

Practical Tips for Controlling Potato Scab

Here’s what we’ve learned — through both science and experience:

1. Check and Adjust Soil pH

Scab hates acidic soil. Aim for pH 5.0–5.2 if possible. You can lower pH using:

• Elemental sulfur
• Acidic compost pine needles, coffee grounds
• Green manures like mustard or sunhemp

2. Keep Soil Moist

Dry soil during tuber formation encourages scab. Try to irrigate lightly but consistently, especially 30–60 days after planting.

3. Avoid Fresh Manure

Fresh manure can raise pH and promote scab. Use well rotted compost instead.

4. Rotate Crops

Don’t grow potatoes or beets, radishes in the same plot every year. Rotate with cereals, pulses, or leafy greens to reduce bacterial buildup.

5. Use Resistant Varieties

Some potato types are less likely to get scab. In Bangladesh, try:

• BARI Alu-25
• Cardinal
• Diamond (moderately resistant)

Final Thoughts

Potato scab might not kill your crop but it can kill your price. Market buyers and consumers judge potatoes by their looks, even if they taste just fine.

Like Rahim Bhai learned, the secret is in the soil. If your soil is too dry or too alkaline, you’re setting yourself up for scab. But with a few simple changes, you can reduce it naturally.

So next time you’re preparing your field, remember it’s not just what you plant, it’s what kind of home you give it.

References

• Farmer Interview: Rahim Uddin, Munshiganj, Bangladesh, conducted January 2023.
• Michigan State University Extension “Managing Potato Scab in Commercial Fields.”
• Bangladesh Agricultural Research Institute (BARI) – Field Report on Potato Diseases, 2020.
• University of Maine Cooperative Extension – “Soil pH and Potato Health.”

4.Potato Virus Y (PVY): The Hidden Trouble in Your Healthy-Looking Plants

You know what’s frustrating?

Spending months caring for your potato crop—watering, weeding, spraying—only to see the yield fall short for some mysterious reason. The plants looked healthy. No pests. No blight. So what went wrong?

That’s what happened to Habibur Rahman, a farmer from Thakurgaon. His potato plants looked just fine from a distance—green, upright, no visible disease. But the tubers were small, and some were even deformed. After getting the plants tested by an agri officer, the diagnosis came: Potato Virus Y, or PVY.

“I thought viruses only affect people,” he laughed nervously. “Turns out, plants catch them too—and they don’t show it until harvest.”

What is Potato Virus Y (PVY)?

PVY is a plant virus that mostly spreads through aphids—tiny sucking insects. It’s one of the most damaging viruses affecting potatoes worldwide. Even a small infection can cause a big loss in yield and quality, especially if your seed source is infected.

The virus moves from plant to plant, silently, through sap-sucking pests or infected tools. And once a plant is infected, there’s no cure only management.

What Does It Look Like?

The tricky part? PVY doesn’t always look the same. Symptoms can be mild, delayed, or even invisible. Here are some signs to watch for:

• Mottled or mosaic patterns on the leaves
• Crinkled, curled, or deformed leaves
• Yellowing of veins especially in older leaves
• Stunted growth
• Poor tuber development and misshapen potatoes

In Habibur’s case, most of the leaves looked normal. But a few had faint mosaic patterns. He thought it was nutrient stress. Turns out, PVY had been silently spreading for weeks.

Research Insights

• A 2021 study by CIP (International Potato Center) shows that PVY can reduce potato yield by 10% to 80%, depending on when the plant gets infected.
• According to Bangladesh Agricultural Research Institute (BARI), PVY is becoming more common due to increasing aphid pressure and lack of certified virus free seed.
• Research from the University of Wisconsin shows that using infected seed tubers is one of the top reasons PVY shows up in a field.

Habibur’s Story: A Lesson in Seed Selection

Habibur planted potatoes on 1.2 acres last season. His neighbor had leftover seed tubers that were cheaper, and he used those without checking.

The plants grew, but something felt off. His crop looked okay but produced 30% fewer marketable tubers. After a lab test confirmed PVY, he decided to make a change.

Here’s what he did the next season:

• Used BARI-certified seed potatoes
• Controlled aphids early with neem spray and yellow sticky traps
• Removed infected looking plants as soon as he spotted them

His yield came back up, and buyers were happy again.

“I thought saving on seed would save money,” he said. “But it cost me twice as much in the end.”

How to Manage and Prevent PVY

1. Start with Clean Seed

Don’t reuse old or leftover seed unless you’re sure it’s virus free. Buy from a reliable, certified source.

2. Control Aphids Early

Aphids are the main carriers. Use:

• Neem oil spray (5 ml per liter of water)
• Yellow sticky traps
• Reflective mulches they confuse aphids

3. Rogueing Infected Plants

If you spot plants with mosaic or curling symptoms, pull them out early and destroy them away from the field.

4. Rotate Crops

Avoid planting potatoes or related crops (like tomatoes or eggplant) in the same spot year after year. Give the soil a break.

5. Train Your Eye

Spend time every few days just walking through your field and watching. Even one sick looking plant can be a warning.

When is PVY Most Likely to Spread?

PVY is most active during:

• Dry, sunny months with aphid activity -December–February in Bangladesh
• Mid-growth stage, when plants are lush and attractive to aphids

Is There Any Cure?

No. Once a plant has PVY, it cannot be cured. That’s why prevention is key. The best farmers deal with PVY by keeping it out of the field altogether.

Final Thoughts

PVY is quiet. It doesn’t crash your field in a single week like late blight. But it slowly eats into your harvest and your profits.

The lesson? Don’t just look at what your plants look like , think about where they came from, and how you’re protecting them.

“Next time I buy seed,” said Habibur, “I’ll think less about the price, and more about the promise of a good harvest.”

References

• Interview with Habibur Rahman, Thakurgaon District Farmer, conducted January 2024.
• CIP – International Potato Center: “Impact of PVY on Global Potato Yields,” 2021.
• BARI (Bangladesh Agricultural Research Institute): “Field Management of Potato Viruses,” 2022.
• University of Wisconsin Extension: “Potato Virus Y: Identification and Management,” 2020.

5. Potato Fusarium (Fusarium spp.) Dry Rot: When the Rot Sneaks In After Harvest

I remember one cold January morning when my uncle, Jamal Uddin, called me over to his storage shed in Dinajpur.

“Come see this,” he said, holding up a potato. “Looks fine on the outside, but inside it’s all gone.”

He sliced it open. The middle was dry, brown, and crumbly — like rotten sawdust.

That’s when I first saw Fusarium Dry Rot with my own eyes.

What Is Fusarium Dry Rot?

It’s a disease that mostly affects stored potatoes, not so much the ones still in the field. Caused by a fungus called Fusarium, it enters through cuts or bruises during harvesting or handling.

The strange part? Potatoes might look okay from the outside, but when you cut them open , there’s dry brown rot inside. No smell, no slime, just dryness and damage.

How It Happens

The fungus lives in:

• Soil
• Cutting knives
• Old sacks
• Storage bins

If you cut or bruise your potatoes during harvest, that’s where Fusarium spores get in. Then during storage, especially if it’s warm or damp, the fungus starts eating away at the potato from the inside.

What It Looks Like

• Sunken brown patches on the skin
• Wrinkled surface
• When cut, inside looks hollow and dry
• Sometimes white or pink mold in the middle

One of our neighbor’s boys said, “Uncle, it looks like a sick potato with no water inside.” Not a bad description.

Story: What Jamal Uddin Did

Uncle Jamal had this problem bad one year. Out of 80 sacks, nearly 15 had rot. At first, he blamed the seeds. But then he realized something , he was cutting seed potatoes with the same dirty knife used last year. And he stored them too quickly, without letting them dry.

The next year, he did a few things differently:

• Left harvested potatoes in shade for 5–7 days to dry and “heal”
• Cleaned the knives in hot water
• Used open bamboo baskets for storage instead of plastic sacks
• Checked the sacks weekly and removed any suspicious ones

It worked. Hardly any rot the next time.

“Turns out, storage matters as much as growing,” he said, smiling.

Real Tips That Work

These are small things we’ve learned on the farm:

Don’t be rough at harvest

Avoid dragging or dropping potatoes. Bruises become entry points for rot.

Let them dry before storing

After digging, keep potatoes in shade not direct sun for 5–10 days.

Use clean tools

Always clean knives or cutters before using on seed potatoes.

Store smart

Use baskets or crates. Don’t pile them too high. Make sure there’s airflow.

Check weekly

Open one or two sacks every week. If you see rot, take it out early.

A Bit of Research

• A BARI report from 2021 says Fusarium dry rot causes 20% or more loss in poorly managed storage units.
• University of Wisconsin notes that seed cuts made with dirty blades are the number one cause of Fusarium entering new crops.
• Fusarium spores can survive for years in wood, sacks, and soil.

That’s why this isn’t just about one bad season — it can keep coming back if you’re not careful.

Can You Still Eat the Potato?

If the rot is small and hasn’t spread, yes , you can cut off the bad part and use the rest. But if it’s deep, dusty, or smells odd, better to throw it away.

No point saving a few taka and risking your health.

Final Words

Fusarium dry rot doesn’t shout. It creeps in quietly. And by the time you notice, you’ve already lost money.

But here’s the good news: You don’t need chemicals or fancy tools. Just a few careful habits , clean tools, gentle handling, airflow and you’re good.

Uncle Jamal still checks his potatoes every Friday. It’s a habit now.

“If the harvest is your victory, then storage is your defense,” he told me. “Don’t lose the battle after winning the war.”

References

• Personal observation from North Bengal farming community (2020–2024)
• BARI – Potato Disease Field Report (2021), Bangladesh
• University of Wisconsin Extension – Potato Post-Harvest Management (2020)
• Farmer Interview: Jamal Uddin, Dinajpur, conducted January 2023

Prevention Tips for Potato Pests and Diseases

• Rotate Crops: Practice crop rotation by avoiding planting potatoes in the same spot for at least 3-4 years. This helps reduce the buildup of soil borne diseases and pests.
• Use Certified Seed Potatoes: Always plant disease free, certified seed potatoes to prevent the introduction of pathogens into your crop.
• Maintain Plant Health: Healthy, well nourished plants are less susceptible to pests and diseases. Use organic matter and balanced fertilizers to keep your soil rich and fertile.
• Proper Spacing: Adequately space your plants to ensure good airflow, reducing humidity levels and discouraging fungal diseases.

By proactively managing pests and diseases and employing integrated pest management (IPM) strategies, you can protect your potato crop and ensure a successful and abundant harvest. Implementing these practices can lead to better yields and healthier plants, making your potato growing experience more rewarding and productive.

For more expert advice on Potato Pests and Diseases, stay connected with us. We’ll provide valuable tips, strategies, and updates to help you maximize your rooftop garden’s potential all winter long. Stay tuned for more insights

Summary Table: Potato Pests and Diseases

Problem Type	Name	Symptoms	Causes / Triggers	Natural Control Tips
Fungal Disease	Late Blight	Dark spots on leaves, wilting, tuber rot	Wet, humid weather	Remove infected plants, apply neem oil spray
Fungal Disease	Early Blight	Brown rings on lower leaves, yellowing	Poor air circulation	Crop rotation, compost tea foliar spray
Insect Pest	Potato Beetle	Defoliation, yellow larvae on undersides	Warm weather, monoculture	Hand pick beetles, grow trap crops like eggplant
Insect Pest	Aphids	Sticky leaves, curled or stunted growth	Over fertilization, warm weather	Spray with soapy water or use ladybugs
Bacterial Disease	Bacterial Wilt	Sudden wilting, brown ring inside stems	Infected soil, contaminated tools	Use clean tools, remove affected plants
Viral Disease	Potato Virus Y (PVY)	Mosaic leaf patterns, curled leaves	Aphid transmission	Control aphids, plant certified virus free seed
Fungal Disease	Black Scurf (Rhizoctonia)	Black crusty spots on tubers	Cool, wet soil	Avoid planting in cold, wet soil, rotate crops
Insect Pest	Wireworms	Tunnels in tubers, poor plant growth	Soil with grass or sod history	Trap with cut potato pieces, use beneficial nematodes

FAQ Potato Pests and Diseases