Unusually severe symptoms are a characteristic of the current epidemic of mosaic virus disease of cassava in Uganda

摘要: Summary Mosaic disease (MD) is more severe in cassava plants infected within the area of current epidemic northern and central Uganda than to south affected area. This difference severity was recorded a single cultivar as well amongst mixtures cultivars found commonly farmers' fields. An increase also occurred passed through localities. Varietal or agroecological factors coincident with are therefore unlikely cause increased severity. The could be graft cutting transmitted super-infect mildly diseased plants. Both severely gave positive reactions ELISA tests antisera prepared against African mosaic virus (ACMV) an unusually form ACMV closely related geminivirus likely disease. involves populations whitefly vector ACMV, Bemisia tabaci, possible hypotheses presented how these phenomena may related.