The Brown Streak Disease Of Cassava

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Nicholas, R.F.W
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Brown streak ,disease of cassava (Mallihot lItilissima Pobl.) was first recorded and described by Storey in a progress report published in 1936[1]. There appear to have been no other published accounts. The Amani work up to 1936 had demonstrated that the disease was perpetuated through vegetative propagation and transmissible through grafting; and in the absence of any visible parasite the causative agent was assumed to be a virus. Later worked to a strong suspicion that a White-Fly (Bemisia sp.), was the vector of the virus in the field[2]; but confirmation of this had not been obtained before the late war interrupted controlled experimental studies of the disease, and it has not been possible, up to the present, to resume them. The information contained in this paper, therefore, is based mainly on field observations. A considerable amount of information relative to geographical distribution, climatic effects and symptoms of the disease has accumulated since Storey's original publicationand is set out in this paper.
East African Agricultural And Forestry Journal, XV (3), p. 154-160