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Bacterial Antagonist as Seed Treatment to Control Leaf Blight Disease of Bambara Groundnut (Vigna subterranea)
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Bacterial Antagonist as Seed Treatment to Control Leaf Blight Disease of Bambara Groundnut (Vigna subterranea)
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Journal Article
Bacterial Antagonist as Seed Treatment to Control Leaf Blight Disease of Bambara Groundnut (Vigna subterranea)
2006
Overview
SUMMAY: Soil samples were taken from 48 fields in the southern part of Thailand in which either bambara groundnut (Vigna subterranea) or groundnut (Arachis hypogeae) had been planted. Bacillus spp. were isolated using soil dilution plates and heat treatment to screen for endospore-producing bacteria. Among 342 Bacillus spp. isolates tested, 168 isolates were not antagonistic to Bradyrhizobium sp. strain NC-92 using dual culture technique. Further testing found 16 isolates of Bacillus spp. had the ability to inhibit mycelial growth of Rhizoctonia solani, a causal agent of leaf blight of bambara groundnut. Among these isolates, Bacillus spp. isolate TRV 9-5-2 had the greatest activity in anti-microbial tests against R. solani. This isolate was later identified as B. firmus. A powder formulation of B. firmus was developed by mixing bacterial endospores, talcum, sodium carboxymethylcellulose (SCMC) and polyvinylpyrolidone (PVP). The formulations contained bacterial levels ranging from 10⁸ to 10¹⁰ c.f.u./g and the viability of bacteria in all formulations remained high after 1 year storage at room temperature (26–32 °C). All formulations showed satisfactory effectiveness in vitro in suppressing mycelial growth of R. solani using dual culture technique. The application of formulations as seed treatment showed that these formulations did not cause abnormality of seedling shape and had no effect on the germination of bambara groundnut seeds.
