Alfalfa mosaic virus

Alfalfa mosaic virus (AMV) is a globally distributed plant virus belonging to the Bromoviridae family. Due to its wide host range, it is considered one of the most economically significant plant viruses, capable of infecting hundreds of different species.

The virus affects numerous crops, particularly legumes such as alfalfa, beans, peas, and chickpeas. In chickpea cultivation, AMV infection can lead to significant yield reductions, stunted growth, and poor seed development, resulting in substantial financial losses for farmers.

Symptoms often vary depending on the host plant but typically include interveinal chlorosis, mosaic patterns on foliage, leaf distortion, and dwarfing. In severe cases, necrotic lesions may appear on stems, and the overall plant architecture becomes deformed, leading to reduced photosynthetic capacity.

The virus is primarily transmitted by various species of aphids in a non-persistent manner, meaning they can acquire and transmit the virus within seconds of feeding. It can also be spread through infected seeds, contaminated tools, and vegetative propagation material, making sanitation practices vital.

Management and prevention strategies involve sourcing certified virus-free seeds and implementing strict weed control measures to eliminate reservoirs of the virus. Integrated Pest Management (IPM) to control aphid populations is crucial during the early stages of plant growth, along with spatial isolation from older perennial legume crops.