Vol. 11, Issue 5 (2022)

Author(s):
Chandra Mani Patel and Ramesh Singh

Abstract:
Rapeseed-mustard belongs to family Brassicaceae. It is the most important group of Rabi oilseed crops and contribute a major share to the vegetable fat of the country. Experiments were conducted during 2018-19 to 2019-20 crop seasons to effective and economic fungicides and plant extracts for the management of Alternaria blight caused by Alternaria brassicae (Berk.) Sacc. and Alternaria brassicicola (Schw.) Wiltshire. The minimum average diameter of fungal growth (mm) Mancozeb (0.00) @0.20% concentration and maximum percent inhibition over control (100.00%) followed by next best effective fungicides Iprodione, Topsin-M, Achook, Ridomil-MZ, Ziram, Captan and Blitox-50 each recorded (0.00 mm) growth of fungus and these were proved to be the most effective as they inhibited the growth of fungus completely. Among the tested fungicides Karathane was least effective which showed (14.7) mm radial growth and (81.62%) inhibition over control. The minimum lowest effective plant extracts Sadabahar was found maximum radial growth of fungus (22.65 mm) and minimum inhitited (71.68%). In the field spraying of Mancozeb @(0.2%) concentration and Iprodione @(0.2%) concentration at the interval of 15 days was found most effective in minimizing the disease intensity. However, the minimum disease intensity Mancozeb (15.07%) was recorded in highest mean yield (20.16) Q/ha @0.20% concentration followed by Iprodione (21.30%) with corresponding yield 19.34Q/ha. followed by next best effective fungicides Topsin-M (30.52%) with corresponding yield (18.39 Q/ha). Achook (31.66) with yield (18.01 Q/ha) respectively. However, they were statistically at par with each other. The next effective fungicides Ridomil-MZ (34.50%) with corresponding yield 16.65 Q/ha, Ziram (37.08%) with corresponding yield 16.32 Q/ha, Captan (35.68%) with corresponding yield 14.38 Q/ha, Blitox-50 (40.58%) with corresponding yield (13.55) Q/ha, Madar (42.27%) with corresponding yield (12.77) Q/ha. Datura proved to be lowest effective plant extracts and showed the (45.47) per cent disease intensity and its corresponding yield (11.38) Q/ha.