Biological control of sheath-blight of rice in india with antagonistic bacteria |
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Authors: | T Vasantha Devi R Malar Vizhi N Sakthivel S S Gnanamanickam |
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Institution: | (1) Centre of Advanced Study in Botany, University of Madras, 600 025 Madras, India |
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Abstract: | Strains of fluorescent and nonfluorescent bacteria that were isolated from rice rhizospheres of Southern India and showed
antagonism towardsRhizoctonia solani were evaluated for biological control of rice sheath-blight (ShB). Efficient strains of bacteria inhibited mycelial growth
ofR. solani, affected sclerotial viabilityin vitro and protected IR 20 and TKM 9 rice seedlings from infection byR. solani in greenhouse tests. Pretreatment of sclerotia in bacterial suspensions resulted in reductions in ShB lesion sizes up to
31 to 44% in IR20 and 58 to 74% in TKM 9 rice. In field plots, IR 50 and TKM 9 rice plants raised from bacterized seeds had
65 to 72% less ShB than those plants from untreated seeds. |
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Keywords: | antibiosis bacterization biological control rice sheath-blight |
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