Cotton diseases and their management
1985
Chiradej Chamswarng | Bunjerd Inwang (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Biocontrol agents including fungi; Trichoderma harzianum and Penicillium sp., and bacteria;- Pseudomonas fluorescens, Bacillus sp. and Streptomyces sp. applied to cotton seeds (Takfa 1) were evaluated for the control of damping-off caused by Rhizoctonia solani. The results indicated that biocontrol agents applied to the seeds both in the sole and combination treatments decreased the infection percentage by 15.0 to 57.5 % Bacillus sp. alone showed the most effective against R. solani, and was also more effective than a fungicide; carboxin (vitavax 75 WP.). The combination treatments were usually more effective than the sole treatments. Culture filtrate of Streptomyces sp. decreased the disease incidence whether using alone or combining with other agents. Populations of fungi and bacteria recovered from the surface of coated seeds were greater than 10 (exp.6) colony forming units per seed.
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