Characterization of Bacillus subtilis and management of wilt of pigeonpea caused by Fusarium udum
2014
Jadhav, R. R. | Giri, G. K. | Belkar, Y. K.
Five isolates of Bacillus subtilis from rhizospheric soil of wilt infected pigeonpea plants, viz. Bs₁, Bs₂, Bs₃, Bs₄ and Bs₅ showed +ve reaction towards all the biochemical tests except HCN, IAA and siderophore production. These isolates were evaluated for their antagonistic ability to reduce incidence of pigeonpea wilt. Isolate, Bs₅ was found most effective against Fusarium udum which recorded 48.12% mycelial growth inhibition in dual culture method. Under green house studies, the isolate Bs₅ recorded minimum wilt incidence (24.05%) with maximum wilt reduction (75.95%) whereas the other isolates recorded 46.16 to 71.80% wilt reduction. Thus, Bs₅ was found most effective isolate for controlling wilt of pigeonpea. Minimum number of colonies (9.75 x 10⁴/g of soil) of Fusarium udum was observed in the soil inoculated with efficient isolate of Bacillus subtilis, Bs₅.
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