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?6a) in response to two rain events of http://www.selleckchem.com/products/smoothened-agonist-sag-hcl.html cell suspension, broth culture and cell-free filtrate, were evaluated for control of soybean SSR, caused by S. sclerotiorum, under control conditions. The results showed that all three preparations provided a significant suppression of SSR in the greenhouse. In general, 5 �� 108 CFU mL?1 provided the best suppression to SRR in all three preparations over 15 DAI under controlled conditions. The efficacy of the three prparations for the SSR suppression decreased over time and was the best when they were applied to plants �� 2 days prior to the S. sclerotiorum inoculation. The SB24 cell suspension showed much better effects in preventive http://www.selleckchem.com/products/epz015666.html protection to soybean plants from SSR than in therapeutic protection. Population density on leaves declined over time and significantly correlated to rainfall during the experimental periods. Some strains of B. subtilis have showed potential effectiveness for control of SSR on other crops. For example, an application of B. subtilis to blossoms of Phaseolus vulgaris reduced the bean SSR over a 2-year field trial (Tu, 1997). Serenade (B. subtilis QST 713 Strain) registered in the USA for control of other plant diseases also showed potential activity against SSR on lima bean (http://www.uaex.edu/OtherAreas/publications). In this study, SB24 showed significantly suppressed SSR on soybean under controlled conditions, indicating it would be a potential B. subtilis strain for control of SSR on soybean under field conditions. The mechanisms of biocontrol are generally classified as competition, parasitism http://www.selleck.cn/products/SP600125.html or predation, and antibiosis (Fravel, 1988). The SB24 action modes were not measured experimentally in this study. However, SB24 cell-free filtrate significantly suppressed mycelial growth and sclerotial production in vitro and reduced disease severity on plants suggesting that diffusible inhibitory substances produced by SB24 cells might play a major role?in disease suppression. Soybean SSR is caused initially by petal infection from ascospores produced from germinating sclerotia. Therefore inhibition of sclerotial production by B. subtilis SB24 after introduction of the bacterium into soybean fields during disease epidemics might suppress sclerotial formation, reducing the number of sclerotia in the soil and plant residues and thus reducing primary infection for the next production season.