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It causes brassica dark leaf spot on most Brassica species, including economically important crops.
During her career as research plant pathologist, US army biological laboratories, Fort Detrick, Maryland and plant pathologist, US Department of Agriculture, Agricultural Research Service, Frederick, Maryland, she conducted extensive research on cereal diseases, including gray leaf spot of corn and rice blast.
Leaf spot disease caused by Alternaria alternata is the most prevalent disease, which is most severe in the plains of Punjab, Haryana, and Himachal Pradesh.