신규 quinolinyloxadiazole 유도체의 생물활성

Biological activities of novel quinolinyloxadiazoles

1,2,4-oxadiazole기를 가진 quinolinyloxadiazole 화합물 KSC-16960을 피 전문 제초제로서 개발하기 위하여 처리시기별 피 방제효과, 직파 및 이앙벼에 대한 안전성, 혼합처리 효과 및 후작물에 대한 특성 등을 조사하였다. 신규 화합물 KSC-16960은 6.25 g/ha 처리량에서도 2엽기의 피를 95% 이상, 3엽기의 피를 90% 이상 방제하였으며, 4엽기 및 5엽기의 피를 90% 이상 방제하는데 요구되는 처리량은 각각 50, 100 g/ha이었다. KSC-16960과 quinclorac의 벼-피간 선택성 폭은 4엽기의 피와 1엽기의 직파벼를 대상으로 할 경우 각각 83, 42배이었으며, 5엽기의 피와 1엽기의 직파벼를 대상으로 할 경우 각각 44, 23배 이었다. KSC-16960+bentazone 혼합처리에서는 상가적, quinclorac+bentazone 혼합처리에서는 길항적인 상호작용을 나타내었으며, KSC-16960 또는 quinclorac과 pyrazosulfuron-ethyl의 혼합처리에서는 모두 상가적으로 나타났다. 온실조건에서 KSC-16960의 후작물 토마토에 대한 약해 발생 가능성은 quinclorac에 비하여 1/4로 감소되었다.

A novel quinolineoxadiazoles, substituted the carboxylic acid group with 1,2,4-oxadiazole radicle, of KSC-16960 and related compounds were evaluated to examine the herbicidal activity, crop injury and residual effect of after-vegetable crops compared with those of quinclorac (3,7-dichloro-8-quinolinecarboxylic acid), of which use is now banned because of its residual activity to some succeeding vegetable crops. KSC-16960 showed 2- and 3-leaf stages of barnyardgrasses effectively controlled by more than 95 and 90%, respectively, at a rate of 6.25 g/ha. The dose of KSC-16960 controlled 4- and 5-leaf stages of barnyardgrasses by more than 90% were found to be 50 g and 100 g/ha, respectively. The selectivity of KSC-16960 between direct-seeded rice and barnyardgrass was approximately 2-fold higher than that of quinclorac when they were treated to the soil. The selectivity indices of KSC-16960 and of quinclorac between 1-leaf stage of direct seeded rice and 5-leaf stage of barnyardgrass were 44 and 23, respectively, and those between 1-leaf stage of direct seeded rice and 4-leaf stage of barnyardgrass were almost 2-fold higher. Application of KSC-16960 with bentazone exhibited an additive controlling effect on several weed species, but that of quinclorac exhibited an antagonistic effect. With pyrazosulfuron-ethyl, on the other hand, both application of KSC-16960 and quinclorac showed additive interactions. Under a greenhouse condition, the residual activity of KSC-16960 to succeeding tomato plants was approximately 4-fold lower compared to that of quinclorac. KSC-16960 could be substituted for quinclorac, if it will be made some more improvement for reducing residual activity.