Studies on the myrothecium leaf spot disease of cotton caused by myrothecium roridum tode exFr
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Date
2014
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CCSHAU
Abstract
Studies on Myrothecium leaf spot disease and management through fungicides and nonconventional
chemicals were carried out with M. roridum causing Myrothecium leaf spot of cotton. In
vitro studies revealed that the maximum disease development was recorded at 25˚C± 1 in both Bt
cotton hybrid MRC -6304 Bt and non Bt cotton H-1098 (64.70 & 40.70% respectively). Under screen
house conditions pre and post inoculation moist period studies revealed that minimum post inoculation
moist period required for initiation of disease was 12 hours and maximum disease infection was found
at 48 hours before and after inoculation. However, pre inoculation moist period resulted in increased
infection but was not as effective as post inoculation period for disease development under screen
house condition. In vitro studies with fungicides and non-conventional chemicals indicated that
propiconazole and cobalt chloride at 100 and 1000ppm concentration gave 100 and 87.9% growth
inhibition of M. roridum respectively. Foliar spray of propiconazole and salicylic acid at 0.1% and
0.01% concentrateion effective in controls disease significantly found7.60 and 23.95% disease
intensity respectively over check in Bt cotton hybrid MRC -6304 Bt and under field conditions. Two
spray of fungicides and non– conventional chemicals significantly increased the seed cotton yield and
its quality parameters. Fifty seven germplasm lines were found highly resistant to Myrothecium leaf
spot disease which can be further used in breeding disease resistant programme.
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Keywords
Cotton myrothecium leaf spot disease, Myrothecium roridum (M.roridum), Fungicides, Non-conventional chemicals