Biological control of Pythium ultimum and Rhizoctonia solani causing damping-off diseases with Bacillus spp. [Egypt]
1988
El-Sheshtawi, M. (Mansoura Univ. (Egypt). Faculty of Agriculture) | Dawood, M.K.
Screening of cucmber rhizosphere-soil under plastic-tunnels by dilution plates method, yielded 20 isolated of antagonistic bacteria which exhibited in vitro inhibitory action against Pythium ultimum Trow and Rhizoctonia solani Kuhn. Two isolates were identified as Bacillus spp. and were highly effective in controlling damping-off of cucumber and tomato seedlings caused by Pythium ultimum and Rhizoctonia solani, respectively, in the green-house conditions. Addition of the antagonistic isolate (SM 4) to sterile or nonsterile soil, at rate of 4g of bacterial peparation to one Kg of soil, resulted in 70% amd 58% surviving plants of cucumber comparing with 28% and 30%, in controls, respectively. In similar treatments the antagonistic isolate (SM 12) exhibited 80% and 82% surviving tomato plants compared with 30% and 32% in controls
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