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测定了闹羊花素 - ( Rhodjaponin- ,简称 R- )等黄杜鹃花提取物对甜菜夜蛾的生物活性。结果表明 ,在非选择性和选择性条件下 ,R- 对甜菜夜蛾 3龄幼虫拒食作用的 AFC50 分别是 30 .71和 7.30 mg·L- 1;乙酸乙酯 ( Et OAc)萃取物的 AFC50 分别是 80 8.82和 650 .43mg· L- 1,拒食活性显著高于其他粗提物。连续饲喂 48h后 ,至第 5天 ,R- 和Et OAc萃取物对试虫的生长抑制中质量浓度 ( IC50 )分别是 1 3.1 1和 1 1 53.48mg·L- 1。
The biological activity of yellow azalea extracts such as Rhodjaponin- (R-) on beet armyworm was determined. The results showed that under non-selective and selective conditions, the AFC50 of R-feeding on the 3rd instar larvae of S. exigua were 30.71 and 7.30 mg · L -1, respectively. The AFC50 of ethyl acetate (Et OAc) extract Respectively, 80 8.82 and 650.43mg · L- 1, antifeedant activity was significantly higher than other crude extracts. After 48 hours of continuous feeding, the inhibitory concentrations of R- and Et OAc extracts on the fifth day were 11.1 and 11.53 mg · L -1, respectively.