Liu T X, Hutchison W D, Chen W, Burkness E C
Vegetable Integrated Pest Management Laboratory, Department of Entomology, Texas A&M University Agricultural Experiment Station, 2415 E. Highway 83, Weslaco, TX 78596-8399, USA.
J Econ Entomol. 2003 Aug;96(4):1230-6. doi: 10.1093/jee/96.4.1230.
The susceptibility of early instars of diamondback moth, Plutella xylostella (L.), and early (first and second) and late instars (third and fourth) of cabbage looper, Trichoplusia ni (Hübner), from Minnesota and south Texas, to indoxacarb and lambda-cyhalothrin was determined in the laboratory. Susceptibilities of the two species from the two geographical locations to indoxacarb and lambda-cyhalothrin varied greatly. P. xylostella from Minnesota was as susceptible to indoxacarb as those from south Texas, whereas both early and late instar T. ni from south Texas were significantly more tolerant to indoxacarb than those from Minnesota. The LC50 values of indoxacarb for early and later instar T. ni at 48 h from south Texas were 4.3- and 34.0-fold greater than those from Minnesota, respectively. Similarly, early instar P. xylostella and late instar T. ni from south Texas were significantly less susceptible to lambda-cyhalothrin than those from Minnesota. Percentage mortality of the two insect species caused by the two insecticides varied with time of exposure and generally exhibited similar patterns of responses to different concentrations for each insecticide.
在实验室中测定了来自明尼苏达州和得克萨斯州南部的小菜蛾（Plutella xylostella (L.)）低龄幼虫以及甘蓝夜蛾（Trichoplusia ni (Hübner)）的早期（一龄和二龄）和晚期（三龄和四龄）幼虫对茚虫威和高效氯氟氰菊酯的敏感性。来自这两个地理位置的这两种昆虫对茚虫威和高效氯氟氰菊酯的敏感性差异很大。来自明尼苏达州的小菜蛾对茚虫威的敏感性与来自得克萨斯州南部的小菜蛾相同，而来自得克萨斯州南部的甘蓝夜蛾一龄和三龄幼虫对茚虫威的耐受性均显著高于来自明尼苏达州的幼虫。来自得克萨斯州南部的甘蓝夜蛾一龄和三龄幼虫在48小时时茚虫威的LC50值分别比来自明尼苏达州的幼虫高4.3倍和34.0倍。同样，来自得克萨斯州南部的小菜蛾低龄幼虫和甘蓝夜蛾高龄幼虫对高效氯氟氰菊酯的敏感性显著低于来自明尼苏达州的幼虫。这两种杀虫剂对这两种昆虫的致死率随暴露时间而变化，并且通常对每种杀虫剂的不同浓度表现出相似的反应模式。
