Cowpea mild mottle virus (angular mosaic of beans).
Abstract Cowpea mild mottle virus (CPMMV) infects a wide range of cultivated legumes. It causes severe mosaic and/or necrosis on the leaves, stems and pods of beans (Phaselous), cowpea (Vigna) and soyabean (Glycine max). Yield losses of 64-80% have been recorded in groundnuts in Kenya (Bock et al., 1976, 1977) and 10-100% in soyabean in Brazil and Argentina (Brown and Rodrigues, 2017). The virus is transmitted in a non-persistent manner by the whitefly, Bemisia tabaci. CPMMV is considered endemic to Africa, but has spread to India, South-East Asia, South America, the Caribbean, Puerto Rico and Mexico. Introduction of the virus to Puerto Rico, and possibly also Mexico, is thought to have been through infected seed from South America and perhaps Africa. The virus poses a threat to soyabean production in the USA and, if introduced into mainland USA, CPMMV has potential to spread through seed, on infected ornamental or vegetable transplants, and by the viruliferous whitefly, itself if previously associated with a virus-infected host.