Greenhouse and field trials of the bacterial antagonists in pellet formulations to suppress sheath blight of rice caused by Rhizoctonia solani


Ashara Pengnoo, D. of Earth Sci., F. of Natural Resources, PSU.
Chirasak Kusongwiriyawong, D. of Pharmaceutical Tech., F. of Pharmaceutical Sci., PSU.
Ladda Nilratana, Technician, D. of Microbiology, F. of Sci., PSU.
Mana Kanjanamaneesathian, Asst. Prof., D. of Pest Management, F. of Natural Resources, PSU.
Corresponding e-mail : kmana@ratree.psu.ac.th

Grant : Government Budget and National Biological Control Research Center, Southern Regional Center
Published : Bio Control 2000, 45 : 245-256
Key words : biological control, Oryza sativa, rice sheath blight

Bacterial formulations, produced using both Bacillus megaterium and B. pumilus individually with pharmaceutical technology, were tested under both greenhouse and field conditions. In the greenhouse testing, some bacterial formulations, for instance For 7 minus Lac and For 16 minus Lac, performed as well as freshly prepared bacterial antagonists in suppress sheath blight disease. In the field testing, For 16 minus Lac was not effective in suppressing sheath blight development. Failure of the For 16 minus Lac to suppress sheath blight disease in the field trial may be due to the dilution and inactivation of antibiotics produced by B. megaterium in the aquatic environment in the rice field and climatic conditions during the formulation application.

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