Brown spots on pepper plants

Bacterial Leaf Spot of Pepper – Vegetables

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Common Pepper Disease

Leaf spots that appear on the lower surface of older leaves as small, pimples and on the upper leaf surface as small water-soaked spots are a symptom of bacterial spot. This is an important pepper disease in Maryland. It also occasionally attacks tomatoes. Eventually, the spots develop gray to tan centers with darker borders. Lesions enlarge during warm, humid weather. Leaves may then turn yellow, then brown and drop. Lesions may also develop on stems. Fruits develop small, raised rough spots that do not affect eating quality. Severely infected leaves will drop resulting in sunscald of peppers. Bacterial leaf spot is spread by splashing rain and working with wet, infected plants. This disease can defoliate plants during wet weather. Hot, dry weather slows the spread of this disease. The disease can come in on seed or transplants and can overwinter in crop residue and soil.

The spots develop gray to tan centers with
darker borders

Leaf spots appear on the lower surface
of older leaves as small, pimples and on
the upper leaf surface as small water-soaked spots

Symptoms on pepper fruit


You can minimize problems with bacterial spot by following these tips:

  1. Select resistant varieties
  2. Purchase disease-free seed and transplants.
  3. Treat seeds by soaking them for 2 minutes in a 10% chlorine bleach solution (1 part bleach; 9 parts water). Thoroughly rinse seeds and dry them before planting.
  4. Mulch plants deeply with a thick organic material like newspaper covered with straw or grass clippings.
  5. Avoid overhead watering.
  6. Remove and discard badly infected plant parts and all debris at the end of the season.
  7. Spray every 10-14 days with fixed copper (organic fungicide) to slow down the spread of infection.
  8. Rotate peppers to a different location if infections are severe and cover the soil with black plastic mulch or black landscape fabric prior to planting.

Brown spots around the veins on a hot pepper plant’s leaves

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Bacterial spot of tomato and pepper

  • Purchase high quality, certified disease free seed if possible.
  • Hot water treatment can be used to kill bacteria on and in seed.
  • For growers producing their own seedlings, avoid over-watering and handle plants as little as possible. Disinfect greenhouses, tools, and equipment between seedling crops with a commercial sanitizer.
  • For growers purchasing transplants, buy plants from reputable growers who start with clean seed and use good cultural practices to reduce disease.
  • Once plants are in the field, avoid overhead watering
  • Do not work in plants when wet to avoid spreading disease.
  • Avoid high-pressure sprays, as these may injure leaves enough to encourage the introduction of the bacterial pathogen.
  • Disinfect pruners and other tools by dipping in a commercial sanitizer, or a 1:9 dilution of germicidal bleach. To be efficient when pruning, have two pruners and alternate between plants to allow proper soaking time.
  • Bury or remove crop debris at the end of the season.
  • Rotate away from tomato or pepper for a year. It is important to control tomato or pepper volunteers during that time.

Browning Pepper Leaves: Why Are Leaves Turning Brown On Pepper Plants

As with every crop, peppersare susceptible to environmental stress, nutrient imbalances, and pest or disease damage. It’s important to assess damage and diagnose it immediately in order to formulate a plan of action. One of the more common problems found on peppers is brown pepper plant foliage. Browning pepper leaves may be the result of any of the above. Keep reading to find out what causes a pepper plant with brown leaves and how to remedy leaves turning brown on pepper plants.

Reasons Pepper Leaves are Turning Brown

Browning pepper leaves may be the result of environmental conditions such as frost damage/chilling injury. Usually, this type of injury will encompass the entire plant. That is, not only the leaves, but the entire plant may become discolored and wilted. Also, the inside of any fruit will become brown as well.

If leaves are turning brown on your pepper plants, it may also be because you forgot to water them. When leaves get brown and crumble, especially accompanied by dropping of leaves and drooping of the plant, it’s likely that the plant is under watered. Be sure to water properly and routinely by watering at the base of the plant, deeply once or

twice per week and mulching around it with organic mulch such as straw or shredded leaves.

If neither of these seems to be the cause of your pepper leaves turning brown, it’s time to consider some other possibilities.

More Serious Causes of Brown Pepper Plant Foliage

Some insects can result in a pepper plant with brown leaves. Whiteflies, for instance, suck juices from the plant and weaken it, resulting in wilting leaves that turn yellow followed by browning. You’ll know it’s whitefly if you give the plant a little shake and a cloud of tiny insects flies up. Use Tanglefoot insect barrier spread on a yellow card to trap the whiteflies and spray the plant with insecticidal soap.

Another insect that may cause foliage to brown is the thrip. It’s not actually the insect that is causing the discoloration, but a virus called spotted wilt that is spread by it. Keep the area around the plants free from weeds which host thripsand remove any infected leaves or completely destroy severely infected plants.

Some fungal diseases may cause foliage to discolor or turn brown. These are spread by splashing water or by tools and your hands as you move around in the garden. Avoid overhead watering and working in the garden when plants are wet from rain. Don’t plant peppers or tomatoes in the same place more than once in a 3- to 4-year time period. Spray with copper sulfate at the first signs of infection. Remove severely infected plants and burn them. Clean up all plant debris.

The last possible reason for a pepper plant with brown leaves is bacterial spot. This bacterial disease is one of the most destructive diseases of peppers. It initially appears as water soaked lesions on leaves that turn brown and irregular in shape. The spots appear raised on the underside of the leaves and sunken on the upper side. Affected leaves then yellow and drop. Fruit may have raised scab-like spots or water soaked lesions that turn brown.

Bacterial leaf spot is transmitted on infected seeds and transplants grown from infected seed. There is no known cure. Prune away infected leaves and practice good sanitation in the garden and with tools. If plants appear to be severely infected, remove and destroy the plants.

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