Abstract
This study was conducted to evaluate the control efficacy of dollar spot on creeping bentgrass after applying various amounts of tebuconazole, chlorothalonil and mixture of tebuconazole and chlorothalonil (tebuconazole+chlorothalonil). In effect of three fungicides on suppression against Sclerotinia homoeocarpa, tebuconazole and tebuconazole+chlorothalonil were found to inhibit more than 98% fungus growth on medium and 70% in chlorothalonil treatment. The control efficacy of tebuconazole at different rates of 31.25, 62.5, and $125a.i.\;mg\;m^{-2}$ on creeping bentgrass showed more than 80%. Application of tebuconazole ($125.0a.i.\;mg\;m^{-2}$), tebuconazole+chlorothalonil ($125.0a.i.\;mg\;m^{-2}+135.9a.i.\;mg\;m^{-2}$) and chlorothalonil ($135.9a.i.\;mg\;m^{-2}$) were suppressed 96%, 80%, 70% for the dollar spot severity, respectively. Correlation between application amount of fungicides and control efficacy of dollar spot was significantly positive, and suggested amount of tebuconazole, tebuconazole+chlorothalonil and chlorothalonil that might suppress more than 80% of dollar spot were calculated to 29.6, 132.2+142.8, and $157.0a.i.\;mg\;m^{-2}$, respectively.
본 연구는 크리핑 벤트그래스에서 발생한 동전마름병의 효율적인 방제방법을 조사하기 위해 tebuconazole의 처리량별 동전마름병 방제율과 tebuconazole과 chlorothalonil 및 두 약제의 합제 처리 시 동전마름병 방제 효과를 평가하였다. 약제 처리 농도별 항균력 조사에서 tebuconzole과 tebuconazole+chlorothalonil 합제는 98% 이상의 S. homoeocarpa 균사 억제 효과를 나타내었고, chlorothalonil는 70% 이하의 균사 억제 효과를 나타내었다. Tebuconazole의 처리량별 동전마름병 방제 효과는 31.25, 62.5 및 $125a.i.\;mg\;m^{-2}$처리구에서 모두 80% 이상의 방제율을 나타내었다. Tebuconazole과 tebuconazole+chlorothalonil 합제 처리구는 80% 이상의 방제율을 나타내나, chlorothalonil 처리구는 약 70%의 방제율을 나타내었다. 살균제의 처리량과 동전마름병 방제 효과는 정의 상관관계를 나타내었고, 80% 이상의 방제 효과를 나타내는 tebuconazole, tebuconazole+chlorothalonil 합제 및 chlorothalonil의 처리량은 각각 29.6, 132.2+142.8, 및 $157.0a.i.\;mg\;m^{-2}$으로 판단되었다.
