Survey for major foliar diseases of Bt cotton in Northern Eastern Karnataka

Abstract

Survey conducted in four districts of Northern Karnataka during kharif 2017-18, revealed that the disease severity of major foliar diseases viz., Alternaria leaf spot, Cercospora leaf spot and bacterial leaf blight ranged from 12 to 51, 8.50 to 30 and 3 to 13 per cent, respectively. The highest severity (51.00%) of Alternaria leaf spot was noticed at Chandrabanda village in Raichur district, maximum severity (30.00%) of Cercospora leaf spot was recorded at Indira Nagar in Raichur district. Whereas, highest severity (13.00%) of bacterial blight was noticed at Halagadda village of Kalaburgi district. The average highest Alternaria leaf spot and Cercospora leaf spot disease severity of 39.57 and 20.37 per cent, respectively was recorded in Raichur district. The average highest bacterial leaf blight severity of 9.28 per cent was recorded in Kalaburgi district.