Author(s): R. CHAKRABARTY, H. KALITA AND A. S. N. ZAMAN

Abstract: Alternaria blight caused by Alternaria brassicae (Berk.) Sacc., is a major disease of Indian mustard (Brassica juncea (L.) Czern. and Coss.) and rapeseed (Brassica campestris var. toria) in Assam. It causes significant reduction (upto 30%) in seed yield. Considering the economic loss caused by the disease, lack of resistant varieties and ecofriendly oilseed production, the present study was carried out to identify genotypes of Indian mustard showing resistance/tolerance to this devastating disease under both natural and artificially inoculated conditions at Shillongani, Assam during Rabi 2015-16. Out of 55 genotypes, seven (RH 1301’, ‘3 IJ3403’, ‘RH 1134’, ‘DRMR 1- 5’, ‘LES 50’, ‘EJ8-118’ and PRL-2010-8’) recorded Alternaria blight severity ranging from 23.4 to 25.0 per cent on leaf at 75 days after sowing (DAS), which were rated as moderately resistant under natural conditions. However, they failed to show resistance at 100 DAS on leaf, only one genotype (‘CS 2800-1-2-3-5-1’) was found to be moderately resistant (25% disease severity on leaf) at 75 DAS.

Download Full Article: Click Here