拟除虫菊酯类杀虫剂对二化螟的生物活性研究

通过室内试验，研究了10种菊酯类农药对水稻二化螟幼虫的生物活性，以及高效氯氟氰菊酯5种剂型对二化螟幼虫的生物活性差异。结果表明：高效氟氯氰菊酯、高效氯氟氰菊酯、S-氰戊菊酯、溴氰菊酯、甲氰菊酯、顺式氯氰菊酯、高效氯氰菊酯、乙氰菊酯、醚菊酯、氟硅菊酯对水稻二化螟幼虫均有较高的活性，LD50（μg /头）分别为0.0017，0.0039，0.0043，0.0070，0.0071，0.0116，0.0119，0.714，0.1779，0.3858，其活性分别是对照药剂三唑磷的0.3-141.59倍，是甲胺磷的2.07- 469.06倍。高效氯氟氰菊酯5剂型对二化螟3龄幼虫的生物活性略有差异，LC50(mg/L)值分别为：0.0945（EW），0.1089（EC），0.1174(ME)，0.1232(SC)，0.1591(WP)。

A Study on Bioactivity of Pyrethroid Insecticides to Chilo Suppressalis

This paper investigated the bioactivity of 10 pyrethroid insecticides to striped rice borer Chilo suppressalis (walker) in the lab. The results showed that the LD50 (μg/larva) of beta-cyfluthrin, lambda-cyhalothrin, esfenvalerate, deltamethrin, fenpropathrin, alpha-cypermethrin, beta-cypermethrin, cycloprothrin, etofenprox, and silafluofen to C. suppressalis are 0.0017, 0.0039, 0.0043, 0.0070, 0.0071, 0.0116, 0.0119, 0.714, 0.1779, 0.3858, respectively. Bioactivity of 5 formulations of lambda-cyhalothrin to C. suppressalis (walker) are different. The LC50 (mg/L) of EW, EC, ME, SC and WP formulations of lambda-cyhalothrin to C. suppressalis (walker) are 0.0945, 0.1089, 0.1174, 0.1232, 0.1591, respectively.