Abstract
Three antagonistic bacteria, Pseudomonas fluorescens 41, Bacillus subtilis 23 and Bacillus megatherium 26, were tested for their ability to control agents of major cotton diseases Xanthomonas malvacearum, Rhizoctonia solani, Fusarium vasinfectum and Verticillium dahliae. Control was achieved in several trials and results demonstrated that the antagonism of tested isolates was in some versions active and in others passive. In laboratory experiments, Bacillus subtilis 23 was the most effective against three of the four phytopathogenic microorganisms. In field trials, the influence of antagonists' metabolites on seed germination, early seedling development, yield of Upland varieties of cotton Gossipium hirsutum 108-F and Kirgiziya-3 and on infection with X. malvacearum and R. solani, were studied. Cultural liquids of all tested antagonists in a dilution 1:9 suppressed development of phytopathogens, and had a stimulating effect on emergence of seedlings, their early growth and cotton yield, and inhibited development of diseases. In this case the most effective antagonists were B. subtilis 23 and P. fluorescens 41.
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