Variability in Target Leaf Spot Pathogen Bipolaris sorghicola of Sorghum in Rajasthan, India

摘要

Target leaf spot, caused by Bipolaris sorghicola (Lefebvre & Sherwin) Alcorn, is known to be prevalent and occasionally severe in the US since 1939 (Dalmacio 2000) and was reported from India by Munjal and Kapoor (1960). Limited information is available on this disease, probably due to its misidentification since its symptoms closely resemble those of other foliar diseases such as zonate leaf spot and gray leaf spot (Dalmacio 2000; Leslie 2002). Target leaf spot was observed to be widely prevalent insouthern Rajasthan during 2001-2004, and critical studies of its symptoms and morphological and cultural characteristics were made to provide dependable identification of the disease in the field. The results of this study are presented and discussed here.