Screening of genotypes against alternaria blight in rapeseed and mustard

The field experiments were conducted at Student’s Instruction Form, ANDUA&T, Kumarganj Ayodhya. The climate is hot and humid summer and cold winters, during the rabi crop season in the year 2017-18. One hundred genotypes of Rapeseed-mustard were used for the present investigation. The earliest appearance of disease (30 days) was noted in genotypes RAURD-09-32, RM-WR-09-5, PAB-09-07, PRB-2004-3-4, RGN-307, RH-0834, RH-0902, RH-0952, RH-0903, RHH-1101, YSWB- 2012/9 (44 days) PPBJ-2, RAURD-09-78, and (45 days) PPBN-3, PT-2006-4 and lowest disease severity was recorded genotypes PHR-2, (9.5) PAB- 2004-4 (20.5) PPBJ-2 (22.2), PPBN-3 (22.3) PPBN-2 (22.6) PPBJ-5 (23.3), PPBJ-3 (24.3), PPBJ-4 (24.5) PAB-2005-16 (24.5), RRM-789, (43.6), RH-0555A, (43.7). AUDPC showed more susceptible genotypes the lowest PHR-2 (214.5) was recorded and genotypes screened, none of the genotypes were found disease -free or highly resistance, only 1 genotype namely (PHR-2) were found resistance, 8 genotypes namely (PPBN-2, PPBN-3, PPBJ-3, PPBJ-2, PPBJ-5, PPBJ-4, PAB-2005-16, PAB- 2004-4), were rated as moderated resistance, 37 moderated susceptible and 54 as susceptible.