Biocontrol of Cotton Pathogens Using Soil Antagonists

摘要

In field trials, the biological efficacy of pre-sowing cotton seed treatment with the antagonist bacteria Bacillus subtilis 23 was studied on upland variety of cotton Gossypium hirsutum C-6524. The strain showed significant (P < 0.05) repression of bacterial blight and damping-off of cotton whereas infection of cotton seedlings by R. solani and X. malvacearum was reduced from 98 to 35% and from 92 to 37%, respectively. Use of B. subtilis 23 resulted in an increase of cotton yield by 26 and 27% in thepresence of bacterial blight and root rot pathogens, respectively. The highest control efficacy (64%) was recorded for Bacillus subtilis 23 against Rhizoctonia solani.