Abstract
Abstract Leaf spots caused by Alternaria macrospora and A. alternata are common in cotton crops around the world. Both species are, however, usually considered to be minor pathogens of Upland cotton (Gossypium hirsutum) but A. macrospora causes premature defoliation with resulting yield loss in cultivars of G. barbadense in Israel and in the USA. A. macrospora is also able to cause defoliation in Upland cotton if the crop is. predisposed to infection by environmental or physiological stress. In Zimbabwe the main predisposing factor is potassium deficiency. The paper discusses the disease in Zimbabwe against the background of work reported from other countries on its effect on yield and on its epidemiology and control.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
