不同作用机制杀虫剂对绿盲蝽室内毒力的温度效应

为了系统地了解不同作用机制杀虫剂对绿盲蝽毒力的温度效应。本文采用食料浸渍法,测定了15、20、25、30、35℃下,8种杀虫剂对绿盲蝽3龄若虫的室内毒力,并结合前期研究结果进行了综合分析。测定结果表明,乙酰胆碱受体激活剂吡虫啉和啶虫脒、几丁质合成抑制剂氟铃脲、氯离子通道激活剂阿维菌素和氯离子通道抑制剂氟虫腈对试虫表现为强正温度效应。温度对钠离子通道调控剂影响较复杂,高效氯氰菊酯为强负温度效应,氰戊菊酯基本不受温度影响,高效氯氟氰菊酯则具有弱负温度效应。乙酰胆碱酯酶抑制剂等其他杀虫剂均受温度影响较小。研究结果说明,除钠离子通道调控剂对绿盲蝽毒力的温度效应较复杂外,其他杀虫剂温度效应均有较强规律性。     

A new aqueous suspension concentrate formulation of cis‐permethrin and its insecticidal activity

Isomers of pyrethroids usually have different insecticidal activities. Permethrin, a non‐cyano pyrethroid, is not an exception and cis‐permethrin is much more active than the trans‐isomer against Triatoma infestans, vector of Chagas' Disease in Argentina. The large‐scale separation of cis‐ and trans‐permethrin was performed by successive recrystallizations from ethanol‐water mixtures. An aqueous suspension concentrate (flowable) formulation of pure crystalline cis‐permethrin was prepared and assayed for its insecticidal activity on wood and ceramic surfaces against nymph V of T infestans. This formulation was at least three times more effective than deltamethrin, with LC₅₀ values on ceramic of 0.11 µg cm⁻² and 0.33 µg cm⁻² respectively. On wood surfaces, the LC₅₀ value was 0.57 µg cm⁻² compared with 3.20 µg cm⁻² for deltamethrin. Against other insect species such as Periplaneta americana, Aedes aegypti and Culex quinquefasciatus, the suspension concentrate formulation of cis‐permethrin was, however, less effective than similar formulations of deltamethrin or β‐cypermethrin. © 2000 Society of Chemical Industry     

拟除虫菊酯多残留气相色谱分析方法的研究

本文报道了一个简单快速的拟除虫菊酯多残留气相色谱分析方法。样本经提取净化后,川~(63)Ni 电子捕获检测器测定,色谱柱为0.5M×3mmU 形玻璃柱,固定液3%OV-101+3%Apeizon,担体为 Gas ChromQ60～80目,对溴氰菊酯等6种拟除虫菊脂在19分钟内完全分离。经河川水、土壤、水果、蔬菜、谷物等13种样本测定回收率在80～100%之间,变异系数为0.8～8.7%,6种农药的最小检测量在1×10~(-12)～5×10~(-12)g 之间。最低检出浓度在0.001～0.006ppm。