CONTROL OF ROOT ROT AND STEM CANKER DISEASE OF COWPEA CAUSED BY THE Fusarium UNDER LATHHOUSE CONDITION

I.K.Hasson,

	CONTROL OF ROOT ROT AND STEM CANKER DISEASE OF COWPEA CAUSED BY THE Fusarium UNDER LATHHOUSE CONDITION
The Iraqi Journal of Agricultural Science
Article 1, Volume 39, Issue 6, 2008, Pages 102-110
Author

Abstract
This experiment was conducted to evaluate biocontrol agent of Trichoderma harzianum and inducing chemical compound Bion in reducing root rot and stem canker disease of cowpea plant caused by the Fusarium graminearum . Results of isolation and identification from infected cowpea plants , Which was collected from different locations from Babylon, that the main causes for the disease is F. graminearum . Reaults of pathogenicity test showed by using cabbage seeds that the eight tested isolates of F. graminearum was pathogenic with germination rate of 0 – 25% . Comparing with the control which was 92 % . Mean while the isolates of F. graminearum ( Fg3 , Fg4 , and Fg5 ) caused disease incidence of 60 , 80 , 100 on cowpea plants of 60 days age respectively comparing with the control of 0 % infection . Results of biocontol effect of T. harzianum and Bion ( 15 days period spraing ) was effected in reducting disease severity by Fg5 to 20 % comparing with the Pathognic fungus alone which was 100 % . The biocontrol treatment and Bion by spray of each 15 days induce the best growth indexs , the plant length , fresh and dry weight of shoot and root was 26 cm , 18 , and 2. 5 gm and 23 cm , 9.5 , 1.7 gm respectively , while it was 13 cm , 5.1 , 1.4 gm and 8 cm , 1. 3 , 0. 5 gm in the treatment of Pathogenic fungus isolate only .

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