两种虫酰肼类新化合物对五种鳞翅目害虫的生物活性

为了比较虫酰肼及其衍生物对鳞翅目 5 种害虫的毒力 ，以虫酰肼为对照药剂，分别采用浸叶法、浸虫法和点滴法测定了虫酰肼衍生物 0593 (Ⅲ f) 和 0673 对甜菜夜蛾 Spodoptera exigua（Hübner）、斜纹夜蛾 Prodenia litura (Fabricius)、小菜蛾 Plutella xylostella (Linnaeus)、棉铃虫 Helicoverpa armigera(Hübner)和玉米螟 Ostrinia furnacalis(Guenée)的毒力；通过浸叶法系统研究了虫酰肼和虫酰肼衍生物 0593 对甜菜夜蛾生长发育的影响。结果表明：0593 和 0673 对甜菜夜蛾 4 龄幼虫的触杀毒力分别是虫酰肼的 11.3 倍和 7.4 倍，对斜纹夜蛾 4 龄幼虫触杀毒力分别是虫酰肼的 30.4 倍和 24.7 倍，对小菜蛾 3 龄幼虫浸虫处理的毒力分别是虫酰肼的 4.7 倍和 4.5 倍 ，对棉铃虫3龄幼虫的触杀毒力分别是虫酰肼的 15.5 倍和 15.2 倍，对玉米螟 4 龄幼虫的触杀毒力分别是虫酰肼的 1.3 倍和 2.0 倍，较虫酰肼的毒力都有很大提高，而0593 和 0673 对 5 种害虫的毒力差异不显著。用虫酰肼和 0593 处理甜菜夜蛾 2 龄幼虫，都能导致存活幼虫陆续死亡；化蛹率和正常蛹数降低；成虫羽化率、单雌产卵量和卵的孵化率显著减少，对后代的繁殖力影响显著；在相同处理浓度下，0593 较虫酰肼对甜菜夜蛾后代繁殖力的不利影响更大。因此，0593 是较虫酰肼杀虫毒力更高、对生长发育和繁殖力不利影响更大的药剂，开发应用价值很大。

Bioactivities of two tebufenozide derivatives against five lepidopteran pests

In order to compare the toxicities of tebufe nozide and its derivatives, the toxicities of tebufenozide derivatives 0593 (Ⅲf) and 0673 against five lepidopteran pests,i.e., Spodoptera exigua (Hübner), Prodenia litura (Fabricius), Plutella xylostella (Linnaeus), Helicoverpa armigera (Hübner) and Ostrinia furnacalis (Guenée), were investigated with leaf-dip, dipping and topical application compared with the tebufenozide. The effects of teb ufenozide and 0593 on growth and development of S. exigua were studied with leaf-dip. The results showed that the contact  toxicities of 0593 and 0673 to 4th-instar larvae of S. exigua were 11.3 and 7.4 times that of tebufenozide, respectively. The contact toxicit ies of 0593 and 0673 to 4th-instar larvae of P. litura were 30.4 and 24.7 times that of tebufenozide, respectively. The toxi cities of 0593 and 0673 to 3rd-instar larvae of P. xylostella with dipping method were 4.7 and 4.5 times that of tebufenoz ide, respectively, and the contact toxicities of 0593 and 0673 to 3rd-instar larvae of H. armigera were 15.5 and 15.2 time s that of tebufenozide, respectively. The contact toxicities of 0593 and 0673 to 4th-instar larvae of O. furnacalis were 1.3 and 2.0 times that of tebufenozide, respectively. The toxicities of 0593 and 0673 to the five pests were higher than that of tebufenozide, but the differences of toxicities between 0593 and 0673 were not significant. Treated with tebufenozide and 0593, the 2nd-instar larvae  of S. exigua died unceasingly after 72 h; the pupation rate and the number of normal pupae were decreased; in addition, adult emergence ratio, eggs laid per female and egg hatchability were also reduced significantly, and the fecundity was so affected significantly. Tebufenozide de rivative 0593 showed more disadvantageous influence than tebufenozide on the fec undity of S. exigua at the same concentration.The results suggest that tebufenozide derivative 0593 is a pesticide with higher bioactivity against lepidopteran larvae and stronger harmful effects on their development and fecundity than tebufenozide, so it is worthy to exploit