Two compounds with strongly insecticidal and fungicidal activity, Kurarinone and Sophoraflavanone G , were isolated from Sophora flavescens Ait under the direction of bioassay, and comfirmed by UV, IR, MS and NMR. The...Two compounds with strongly insecticidal and fungicidal activity, Kurarinone and Sophoraflavanone G , were isolated from Sophora flavescens Ait under the direction of bioassay, and comfirmed by UV, IR, MS and NMR. The insecticidal activity of flavonoids from Sophora flavescens Ait was first reported here. The study of structure-activity relationship indicated that the methylation of 5-hydroxy on the phenyl ring would decrease the insecticidal and fungicidal activity of flavonoids.展开更多
测定了雷公藤总生物碱对小菜蛾和菜青虫的室内毒力,以及0.1%雷公藤生物碱乳油对两种害虫的田间防效。结果表明,雷公藤总生物碱对小菜蛾3龄幼虫48和72 h的LC50值分别为228.28和136.67 m g/L,对菜青虫5龄幼虫48和72 h的LC50值分别为307.61...测定了雷公藤总生物碱对小菜蛾和菜青虫的室内毒力,以及0.1%雷公藤生物碱乳油对两种害虫的田间防效。结果表明,雷公藤总生物碱对小菜蛾3龄幼虫48和72 h的LC50值分别为228.28和136.67 m g/L,对菜青虫5龄幼虫48和72 h的LC50值分别为307.61和238.18 m g/L;1.0%雷公藤生物碱乳油对小菜蛾的毒杀作用较强,其48和72 h的LC50值分别为69.62和20.35 m g/L,对菜青虫48和72 h的LC50值分别为93.18和44.62 m g/L。250倍稀释的雷公藤生物碱乳油(有效含量为40 m g/L)田间喷雾处理对小菜蛾和菜青虫均具有较好的防治效果,施药后7 d的防治效果分别为82.93%和82.71%,在本试验剂量范围内对作物安全。可见,雷公藤生物碱制品对两种蔬菜害虫控制效果显著。展开更多
The non alkaloid contents were extracted from the root bark of Tripterygium wilfordii Hook. The results of bioassy showed that the non alkaloid extracts has abviously insectidal activities to imported cabbage worm ( P...The non alkaloid contents were extracted from the root bark of Tripterygium wilfordii Hook. The results of bioassy showed that the non alkaloid extracts has abviously insectidal activities to imported cabbage worm ( Pieris rapae L.).LC 50 values of poisoning to the 5th instarts of Pieris rapae is 7.23 mg·L -1 . The values of medium antifeeding concentration (AFC 50 ) of the non alkaloid extracted against the 5th larval of Pieris rape is 11.34 mg·L -1 . Median narcosis dose (ND 50 ) is 15.54 μg/g.Median contact dose (LD 50 ) is 3.1079 μg/head. The non alkaloid extracts have no fumigant to insect. The main poisoning symptoms are that the tested insect showed paralysis and the epiderm of the larval turns black, the larval are dead at last.展开更多
文摘Two compounds with strongly insecticidal and fungicidal activity, Kurarinone and Sophoraflavanone G , were isolated from Sophora flavescens Ait under the direction of bioassay, and comfirmed by UV, IR, MS and NMR. The insecticidal activity of flavonoids from Sophora flavescens Ait was first reported here. The study of structure-activity relationship indicated that the methylation of 5-hydroxy on the phenyl ring would decrease the insecticidal and fungicidal activity of flavonoids.
文摘测定了雷公藤总生物碱对小菜蛾和菜青虫的室内毒力,以及0.1%雷公藤生物碱乳油对两种害虫的田间防效。结果表明,雷公藤总生物碱对小菜蛾3龄幼虫48和72 h的LC50值分别为228.28和136.67 m g/L,对菜青虫5龄幼虫48和72 h的LC50值分别为307.61和238.18 m g/L;1.0%雷公藤生物碱乳油对小菜蛾的毒杀作用较强,其48和72 h的LC50值分别为69.62和20.35 m g/L,对菜青虫48和72 h的LC50值分别为93.18和44.62 m g/L。250倍稀释的雷公藤生物碱乳油(有效含量为40 m g/L)田间喷雾处理对小菜蛾和菜青虫均具有较好的防治效果,施药后7 d的防治效果分别为82.93%和82.71%,在本试验剂量范围内对作物安全。可见,雷公藤生物碱制品对两种蔬菜害虫控制效果显著。
文摘The non alkaloid contents were extracted from the root bark of Tripterygium wilfordii Hook. The results of bioassy showed that the non alkaloid extracts has abviously insectidal activities to imported cabbage worm ( Pieris rapae L.).LC 50 values of poisoning to the 5th instarts of Pieris rapae is 7.23 mg·L -1 . The values of medium antifeeding concentration (AFC 50 ) of the non alkaloid extracted against the 5th larval of Pieris rape is 11.34 mg·L -1 . Median narcosis dose (ND 50 ) is 15.54 μg/g.Median contact dose (LD 50 ) is 3.1079 μg/head. The non alkaloid extracts have no fumigant to insect. The main poisoning symptoms are that the tested insect showed paralysis and the epiderm of the larval turns black, the larval are dead at last.
