What Can Affect Peppers - Win the Battle Against Diseases an

Q: Why Are Pepper Leaves Curling?

Curled pepper leaves are often caused by pest infestation , particularly aphids or whiteflies. These pests suck plant sap and secrete honeydew, which can lead to leaf deformation. Check the undersides of leaves and treat with appropriate insecticide or natural solutions like neem oil.

Common Pepper Problems: What Can Go Wrong and How to Fix It

Peppers are a highly popular vegetable that you can grow in your own garden. Read on to discover what problems these plants might encounter during their growth...

Why Are Pepper Leaves Turning Yellow?

Yellowing leaves on peppers can indicate several issues. The most common cause is nitrogen deficiency, especially when the lower leaves turn yellow first. In this case, apply a balanced fertilizer with higher nitrogen content.

Another frequent cause is overwatering or poor drainage. Peppers don't like waterlogged soil - their roots need oxygen. If the soil is constantly wet, the roots can rot, leading to yellowing leaves.

Yellow leaves can also signal magnesium deficiency, which typically appears as yellowing between the veins while the veins themselves remain green. This problem can be solved by applying Epsom salt (magnesium sulfate).

Why Are Pepper Leaves Curling?

Curled pepper leaves are often caused by pest infestation, particularly aphids or whiteflies. These pests suck plant sap and secrete honeydew, which can lead to leaf deformation. Check the undersides of leaves and treat with appropriate insecticide or natural solutions like neem oil.

Leaf curl can also be caused by viral diseases such as pepper mosaic virus. Unfortunately, there's no cure for viral infections - affected plants should be removed to prevent spread to healthy plants.

Environmental stress is another common cause. Sudden temperature changes, strong wind, or inconsistent watering can cause leaves to curl as a protective mechanism.

Brown Spots on Pepper Leaves

Brown spots on pepper leaves often indicate fungal diseases. The most common is bacterial spot, which appears as small brown spots with yellow halos. This disease thrives in humid conditions and spreads through water splashes.

Prevention is key:

Water plants at the base, avoiding leaves
Ensure good air circulation between plants
Remove affected leaves immediately
Apply copper-based fungicides preventively

Sunscald can also cause brown spots, especially on fruits but sometimes on leaves too. This occurs when plants are suddenly exposed to intense sunlight without gradual acclimation.

Why Are Pepper Flowers Dropping?

Flower drop is a frustrating problem for many gardeners. The most common cause is temperature stress. Peppers are sensitive to extreme temperatures - they drop flowers when nighttime temperatures fall below 13°C or daytime temperatures exceed 35°C.

Insufficient pollination can also lead to flower drop. While peppers are self-pollinating, they benefit from gentle air movement or the presence of pollinators. In greenhouses, you can help by gently shaking the plants during flowering.

Other causes of flower drop include:

Inconsistent watering - both drought and overwatering
Nitrogen excess (too much nitrogen promotes leaf growth at the expense of flowering)
Lack of calcium in the soil
Insufficient light

Blossom End Rot on Peppers

Blossom end rot manifests as dark, sunken spots on the bottom of the fruit. This problem is caused by calcium deficiency, but it's not always due to lack of calcium in the soil - often it's about improper uptake.

The main cause is irregular watering. When soil moisture fluctuates significantly, plants cannot absorb calcium efficiently even if it's present in the soil. Maintain consistent soil moisture through regular watering and mulching.

Excessive nitrogen or salt in the soil can also inhibit calcium uptake. If you notice this problem, apply calcium foliar spray and ensure regular, even watering.

Peppers Not Setting Fruit

If your peppers are growing beautifully but not producing fruit, several factors may be at play:

Temperature is the most common culprit. Peppers need temperatures between 18-27°C for optimal fruit set. Outside this range, pollen may be sterile or flowers may simply drop.

Over-fertilization with nitrogen leads to lush green growth but poor fruiting. Switch to fertilizer with higher phosphorus and potassium content during the flowering stage.

Insufficient light can also prevent fruiting. Peppers need at least 6-8 hours of direct sunlight daily. In shaded locations, they'll produce leaves but few fruits.

Pest Prevention and Control

Besides aphids and whiteflies, peppers can be attacked by other pests:

Spider mites - appear in hot, dry conditions, creating fine webbing on leaves
Thrips - cause silvery spots on leaves and deformed fruits
Pepper weevils - lay eggs in buds and fruits, causing them to drop

Prevention is the best defense. Maintain healthy plants through proper watering and fertilizing, inspect plants regularly, and intervene at the first sign of problems. Natural predators like ladybugs and lacewings can help keep pest populations under control.

When to Water and How Much?

Proper watering is fundamental to healthy pepper growth. Peppers need consistent moisture but not waterlogged soil. The soil should be moist to a depth of about 15 cm but should dry slightly between waterings.

During hot summer months, this may mean watering daily, while in cooler weather, 2-3 times per week is sufficient. Always check soil moisture before watering - stick your finger into the soil; if it's dry about 2-3 cm below the surface, it's time to water.

Mulching around plants helps maintain consistent soil moisture, suppresses weeds, and protects roots from temperature extremes.

Conclusion

Growing peppers doesn't have to be complicated, but it requires attention and understanding of plant needs. Most problems can be prevented through proper care - regular watering, balanced fertilization, good air circulation, and regular inspection. If problems do occur, early identification and intervention are key to successful resolution. With a little care and patience, you'll be rewarded with an abundant harvest of delicious, healthy peppers.

Peppers, along with tomatoes, are among the most commonly grown types of vegetables. Climate conditions allow pepper cultivation without major restrictions.

However, the truth is that in colder areas, greenhouses, hotbeds, or at least sheltered locations are more suitable for growing peppers.

In greenhouses, peppers usually share space with tomatoes and cucumbers, which can sometimes cause problems, because while cucumbers and tomatoes prefer drier locations, peppers love tropical humid air.

Peppers (lat. Capsicum) are plants from the nightshade family (lat. Solanaceae). Their original homeland is Central America, where they were grown in the tropics.

For this reason, peppers prefer a more humid, warm location. Today, however, it is no problem to create suitable conditions almost anywhere in the world.

There are two basic types of peppers - hot ones called chilli and sweet ones called bell peppers.

Peppers are grown for their fruits, which are consumed as vegetables; chilli peppers used as spices are particularly popular.

Information is key when growing peppers

Whether you decide to grow bell peppers or chilli peppers, you should know as much as possible about pepper cultivation, because beautiful peppers will only grow under the hands of more experienced and well-informed growers.

The stumbling block when growing peppers can be the sowing itself. Peppers have a very long growing season, so you need to start pre-cultivation of young seedlings no later than mid-March. Even the sowing itself is an art.

Perhaps the most proven method is sowing in perlite (Agroperlit). Sow seeds in pots filled with well-moistened perlite. After sowing, cover the seeds with a thin layer of this material so that they are not completely covered.

To maintain constant moisture and higher temperature (ideally around 28 - 30 °C), place the seeds in a special mini greenhouse, which you can also purchase in our e-shop.

By purchasing one, you will save yourself a lot of work ensuring suitable conditions for germination. Don't forget to place the sowing in a bright location. After germination, provide the plants with sufficient light, warmth and nutritious substrate.

You can preventively treat transplanted seedlings against damping-off, for example with Previcur.

Peppers are very diverse, just choose!

Peppers Love Plenty of Nutrients and Warmth

Since peppers are mainly grown in greenhouses, growers face another challenge arising from limited growing space - depleted soil.

A more laborious method is complete soil replacement in the greenhouse, much simpler is using calcium nitrate. Calcium nitrate is best spread in autumn on dug beds or in the greenhouse, then worked into the soil.

Soil treatment with calcium nitrate can also be done in spring, but at least 3 weeks before planting. Peppers love plenty of nutrients in the soil, so it's worth working compost or manure into the bed intended for growing peppers (how to grow chilli on our second blog Semena-marihuany.cz). Don't fertilize immediately before planting.

Plant young plants in their location only when temperatures don't drop below freezing. If you're growing peppers in an outdoor bed, try growing on black mulch fabric.

The fabric helps warm the soil and additionally prevents weeds from growing through it. You can provide protection to freshly planted seedlings with white fleece fabric, which you drape over the plants initially.

Cold and ground frost are among the biggest threats that young peppers can face.

Don't plant peppers too close together, the ideal spacing is approximately 25 cm for smaller varieties up to at least 50 cm for robust plants.

Thoroughly water the hole dug for the pepper and only then place the young seedling in it, the lower leaves should be just above the substrate surface. After planting, add the remaining soil and water.

Planting and the period immediately after are most critical for peppers. If you manage to get through it without damage, you're halfway there.

The second half to success is fighting, or better yet preventing diseases and pests, which readily attack peppers.

The foundation is healthy plants, which you'll achieve through regular watering, occasional fertilizing and maintaining higher air humidity.

Bees and other pollinators have limited access to peppers grown in greenhouses, so it's better to help with pollination yourself too. Either with a classic brush or at least by gently shaking the flowering pepper.

Peppers love humid locations, which is why greenhouses and cold frames suit them well, as the required conditions can be achieved more easily there. If you don't have a greenhouse, don't despair - many varieties can be grown without problems in sunny locations in garden beds.

These are mainly varieties with thin flesh, which are less delicate. On the other hand, plants with thick-fleshed fruits will grow better in a greenhouse. Even growers who can only cultivate peppers in a pot on the balcony have hope for their own peppers.

Some varieties can handle pot cultivation without major problems. However, you must place them in the warmest possible location with plenty of sunlight.

For pot cultivation, "ornamental peppers" are more suitable, but it's not impossible to grow classic peppers in a pot either.

It's said that peppers and tomatoes don't get along very well. There's certainly some truth to this, as it stems from their different moisture requirements. While peppers prefer tropical conditions (humidity and warmth), tomatoes need warmth and dryness.

Unfortunately, space constraints force growers to place these two plants together in the greenhouse, which isn't entirely ideal. When there's no other option, try to position tomatoes near doors and windows in the greenhouse where they'll have plenty of air, and place peppers in the center of the greenhouse where the air is naturally slightly more humid.

What diseases and pests most commonly attack peppers?

Peppers are most commonly attacked by aphids. Fighting them is a long-term battle, because very soon after eliminating one batch of aphids, new aphids appear on the peppers.

Pepper growers constantly try to find the best means to combat this resilient insect. Some rely on "proven" old remedies and wash peppers with soapy water, others trust insecticidal preparations, and ecologically-minded growers use oil-based products that are completely harmless.

Whether you prefer insecticides or ecological products, you'll definitely find something in our e-shop selection. Spider mites are other pests that create fine webs on peppers.

The same products used to eliminate aphids can be used to eliminate spider mites. If you notice "white flies" flying near your peppers, you have the honor of encountering whiteflies.

Whiteflies are quite difficult to eliminate; as a preventive measure, yellow sticky traps can be placed near the peppers. In case of whitefly occurrence, quick action is necessary before they multiply.

When growing peppers, you may encounter various deformations of fruits and leaves, which can be caused by genetic disorders or poor pollination.

However, a more common cause is irregular watering, large temperature fluctuations, calcium deficiency in the soil, or conversely, excess potassium.

When handling peppers, be careful not to damage their tissues, as damaged areas very often become sources of various infections and rot, which quickly spread throughout the entire plant.

Regularly remove affected parts of plants to prevent the potential spread of diseases.

Peppers are attacked by cucumber mosaic virus, which causes deformation and reduced growth of pepper fruits. Brown spots appear on the leaves of diseased plants.

You'll most commonly encounter this disease in the second half of summer. Other viral diseases of peppers include tomato spotted wilt virus and pepper bronzing.

Various colored, scattered spots appear on the fruits of affected plants. Peppers significantly slow their growth and, if care is neglected, may even die.

Root and root collar rot is particularly troublesome. Prevention against them includes regular crop rotation, removal and proper disposal of affected plant parts.

In case of root or root collar rot occurrence, it's advisable to disinfect the soil after the season, for example by liming.

Whether you decide to grow classic sweet peppers (bell peppers) or prefer chili peppers, in our e-shop you'll find a wide selection of seeds and products suitable for protection against diseases and pests. Give peppers a chance!

Best of luck with growing peppers from LenkaZ.