Pea early browning

Pea early browning (PEB) is a viral disease caused by the Pea early browning virus (PEBV). It is primarily a soil-borne disease, where the virus particles are transmitted to the roots of host plants by ectoparasitic nematodes belonging to the genera Trichodorus and Paratrichodorus.

The virus affects a diverse range of crops, causing significant agricultural damage. While peas are the most common host, other plants, including sweet pepper, are also susceptible to infection. The ability of the virus to persist in the soil and infect various host plants makes it a persistent challenge for farmers and agronomists.

Symptoms of the disease vary depending on the host but generally include chlorotic spotting, stunted growth, and ring-like necrosis on leaves. In severe cases, the stems turn brown, and plants may collapse before reaching maturity. The "early browning" name stems from the premature death of foliage, which drastically impacts the yield and quality of the harvest.

Environmental factors, particularly soil moisture and temperature, play a critical role in the transmission of the virus. The virus spreads most effectively during wet springs when the vector populations are highly active in the rhizosphere. Soil texture often influences the distribution of the nematode vectors, with lighter sandy soils being more conducive to their movement.

Effective management strategy includes:

• Implementation of long-term crop rotation cycles.
• Strict control of weed populations that act as alternate hosts.
• Use of nematode-resistant crop varieties where available.
• Soil sterilization or fumigation in areas with a history of high PEBV infection rates.