Peanut stunt virus

Peanut stunt virus (PSV) is a significant viral pathogen belonging to the Cucumovirus genus. This disease causes severe stunted growth in affected plants, impacting the overall plant architecture, metabolic efficiency, and reproductive success of various agricultural crops.

The virus has a broad host range, primarily infecting legumes including peanuts, soybeans, and common beans. It is also known to affect tobacco plants, which acts as an alternative host that can facilitate the survival and overwintering of the virus in diverse agricultural environments.

The most common symptoms include marked stunting, shortening of internodes, and a reduction in leaf size accompanied by mosaic patterns or chlorosis. In peanut crops, the virus leads to distorted pods, empty shells, and shriveled seeds, resulting in a substantial reduction in both yield quantity and quality.

The virus is transmitted in a non-persistent manner by several species of aphids, such as Aphis craccivora, which acquire the virus while probing infected plants. Additionally, the pathogen can be spread through infected seed lots, facilitating long-distance dissemination and making it a challenge for global crop production and seed trade.

Control strategies are focused on minimizing vector exposure and removing sources of inoculum. This includes the application of insecticides to control aphid populations, the removal of weeds that act as alternative hosts, and the strict use of certified, virus-free seeds. Crop rotation and temporal isolation from neighboring infected fields are also critical components of effective disease management.