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Development of Antagonistic Microorganism for Biological Control of Dollar Spot of Turfgrass  

Shim, Taek-Su (Green Biotech Co., Ltd)
Jung, Woo-Cheol (Green Biotech Co., Ltd)
Do, Ki-Seok (Green Biotech Co., Ltd)
Shim, Gyu-Yul (Korea Turfgrass Research Institute)
Lee, Jae-Ho (Green Biotech Co., Ltd)
Choi, Kee-Hyun (Green Biotech Co., Ltd)
Publication Information
Asian Journal of Turfgrass Science / v.20, no.2, 2006 , pp. 191-201 More about this Journal
Abstract
Dollar spot caused by Sclerotinia homeocarpa is one of major diseases in putting greens. Microorganisms antagonistic to S. homeocarpa, a pathogen of dollar spot, were primarily screened through in vitro tests, including dual culture method and triple layer agar diffusion method. In vivo tests were also conducted to select the best candidate for a biocontrol microorganism, using pot experiment. Bacillus subtilis EW42-1 and Trichoderma harziaum GBF-0208 were finally selected as biocontrol agents against dollar spot. Relative Performance Index(RPI) was used as a criterion of selecting potential biocontrol agents. B. subtilis EW42-1 and T. harzianum GBF-0208 showed resistance to several agrochemicals mainly used in a golf course. B. subtilis EW42-1 and T. harzianum GBF-0208 suppressed effectively the disease progress of dollar spot like synthetic fungicide tebuconazole in the nursery where dollar spot had seriously occurred. B. subtilis EW42-1 and T. harzianum GBF-0208 have a potential to be biocontrol agents for the control of dollar spot.
Keywords
biological control; Bacillus subtilis EW42-1; dollar spot; resistance to agrochemicals; Trichoderma harzianum GBF-0208;
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