Survey and surveillance of Myrothecium leaf spot disease (Myrothecium roridum) in soybean growing area of Chhattisgarh

Abstract

Myrothecium leaf spot of soybean caused by Myrothecium roridum. Myrothecium leaf spot of soybean is occurring in almost all the major soybean growing areas of India causing about 30 per cent yield loss. Initial symptoms of the disease appear as small round or oval, brown spots with dark brown margin on leaves in the infected plant. In Survey studies an intensive disease survey of the target leaf spot disease of soybean during June to August in Kharif 2015 was undertaken in different soybean growing area at Bemetra, Saja, Mungeli, Kawarda, Lohara, Gandai, Chhuhikhadan, Khairagarh, Rajnandgaon of Chhattisgarh region. Maximum percent disease incidence (48.50%) was observed in Gandai block, followed by Mungeli (42.10%) and Rajnadgaon (40%) and minimum percent disease incidence (21.87%) of myrothecium leaf spot of soybean was found in Saja block. Maximum average percent disease index (52.5%) was observed in Gandai block, followed by Mungeli (47.5%) and Rajnadgaon (37.5%) and minimum average percent disease index (17.5%) was observed in Saja block.