Metzger M E, Rust M K, Reierson D A
Department of Entomology, University of California, Riverside 92521-0314, USA.
J Econ Entomol. 1996 Aug;89(4):935-9. doi: 10.1093/jee/89.4.935.
A bioassay was developed to determine the efficacy of insecticides against adult cat fleas, Ctenocephalides felis (Bouché), on turfgrass. Activity was assessed by exposing adult fleas to treated and untreated disks of turf for 24 h, 1 and 7 d after treatment. Filter paper, a representative nonwaxy, porous substrate was bioassayed in similar fashion 1 d after treatment to confirm insecticide activity. Results demonstrated the relative efficacy of insecticides applied to turf at different rates as well as differences among insecticides. Of 10 insecticides tested, chlorpyrifos wettable powder and emulsifiable concentrates consistently provided greatest kill of adult fleas. Although initially active, pyrethroid insecticides and diazinon generally showed significant declines in residual activity by day 7. Possible reasons for differences in activity are discussed.
已开发出一种生物测定法，以确定杀虫剂对草坪草上成年猫栉首蚤（Ctenocephalides felis (Bouché)）的功效。在处理后的24小时、1天和7天，通过将成年跳蚤暴露于经处理和未经处理的草坪圆盘上来评估活性。处理1天后，以类似方式对作为代表性非蜡质多孔基质的滤纸进行生物测定，以确认杀虫剂活性。结果表明了以不同剂量施用于草坪的杀虫剂的相对功效以及杀虫剂之间的差异。在所测试的10种杀虫剂中，毒死蜱可湿性粉剂和乳油始终能对成年跳蚤产生最大杀伤力。拟除虫菊酯类杀虫剂和二嗪农虽然最初具有活性，但到第7天其残留活性通常会显著下降。文中讨论了活性差异的可能原因。
