Peanut stunt virus

Peanut stunt virus (PSV) is a destructive plant virus classified within the genus Cucumovirus, family Bromoviridae. It is recognized as a significant pathogen that affects a wide range of dicotyledonous crops, causing major economic losses in peanut production globally.

The disease is characterized by severe stunting of the entire plant, shortened internodes, and smaller, chlorotic leaves. Infected peanut plants typically produce malformed pods and shriveled, discolored seeds, which are significantly reduced in size compared to healthy specimens.

The virus is primarily transmitted by several species of aphids (such as Aphis craccivora) in a non-persistent, stylet-borne manner. The aphid acquires the virus from an infected plant within seconds of probing and can transmit it to a healthy host almost immediately without any latent period.

Environmental factors, particularly temperature and the presence of perennial weed hosts, heavily influence the spread of PSV. The virus persists in various wild legumes and other hosts during the winter, providing a consistent source of inoculum for newly emerging spring crops.

Management strategies focus on minimizing virus entry and transmission. Essential practices include using certified virus-free seeds, controlling aphid vector populations through targeted insecticide programs, and removing host weeds from the field borders. Crop rotation and maintaining physical distance from older, infected fields are also critical for long-term protection.