Southern Peas With Blight: Understanding the Disease and How to Prevent It

Southern peas, also known as cowpeas or black-eyed peas, are a staple in Southern cuisine. However, they are susceptible to a disease called blight that can cause significant damage to crops. In this article, we will explore what blight is, how it affects peas, and what can be done to prevent it from spreading.

What is Blight?

Blight is a plant disease caused by fungi or bacteria. It is characterized by the sudden and rapid death of plants or plant parts, such as leaves, stems, and flowers. Blight can affect a wide range of plants, including tomatoes, potatoes, peppers, and peas.

The most common types of blight that affect Southern peas are bacterial blight and southern stem blight.

Bacterial Blight

Bacterial blight is caused by the bacterium Xanthomonas axonopodis pv. vignicola. It typically occurs during warm and humid weather conditions, especially when there is frequent rainfall or overhead irrigation. The bacteria can spread through rainwater, irrigation water, and contaminated equipment and tools.

The symptoms of bacterial blight include water-soaked spots on leaves, which later turn brown and necrotic. The infected leaves may eventually fall off, leaving the vines exposed to sunlight and heat stress. The bacteria can also infect the pods, causing them to rot and turn brown.

Southern Stem Blight

Southern stem blight is caused by the fungus Sclerotium rolfsii. It typically occurs during hot and humid weather conditions, especially when there is high moisture content in the soil. The fungus can survive in the soil for several years, making it difficult to control.

The symptoms of southern stem blight include wilting and yellowing of leaves, which later turn brown and dry out. The infected vines may appear girdled or constricted at the soil line, leading to the death of the entire plant. The fungus can also produce small, round, tan-colored sclerotia on the surface of the soil, which can serve as a source of infection for subsequent crops.

Preventing Blight

Preventing blight requires a combination of cultural practices and chemical treatments. Here are some tips to keep in mind:

Plant resistant varieties

Some Southern pea varieties are more resistant to blight than others. Be sure to select seeds from reputable suppliers who have tested their products for disease resistance. Popular resistant varieties include Mississippi Silver, Mississippi Purple, and Pinkeye Purple Hull.

Practice crop rotation

Crop rotation can help reduce the buildup of blight-causing organisms in the soil. Avoid planting peas or other legumes in the same spot for two years in a row. Instead, rotate with non-legume crops like corn, tomatoes, or cucumbers.

Avoid overhead watering

Overhead watering can spread blight-causing organisms from plant to plant. Use drip irrigation or direct the water at the base of the plants instead.

Monitor for pests and diseases

Regularly inspect your plants for signs of blight, as well as other pests and diseases. Remove and destroy any infected plants immediately to prevent the spread of the disease.

Apply fungicides

If blight is present in your area, apply a fungicide to protect your plants. Follow the instructions carefully and apply the fungicide early in the growing season before the disease becomes established.

Bacterial Blight on Southern Peas

Blight is a serious disease that can cause significant damage to Southern peas. However, with proper prevention measures, it is possible to minimize the risk of infection and ensure a healthy crop. Remember to select resistant varieties, practice crop rotation, avoid overhead watering, monitor for pests and diseases, and apply fungicides as needed. By taking these steps, you can enjoy a bountiful harvest of delicious and nutritious Southern peas.

Bacterial Blight, Southern Stem Blight, Crop Rotation, Fungicides, Pest Control