Ross M H
Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg 24061.
J Econ Entomol. 1992 Feb;85(1):123-9. doi: 10.1093/jee/85.1.123.
Late-instar German cockroaches from an insecticide-susceptible field strain (Fairbanks) and four pyrethroid-resistant field strains were exposed to vapors of a cyfluthrin flowable concentrate (FC) and the formulation blank (formulation without the active ingredient). Experiments with other pyrethroid formulations were done with the Fairbanks strain and an insecticide-resistant field strain (K-851) because these strains exemplified the maximum interstrain variation in experiments with the FC. In these experiments, I used a cyfluthrin wettable powder (WP) and its blank, a cyfluthrin emulsifiable concentrate (EC), and a permethrin aerosol and its blank. Vapors of the FC and its blank caused the most rapid dispersal. Dispersal induced by vapors of the WP, EC, and aerosol formulations was low and variable. In general, less of a dispersal response occurred in the resistant strains than in the susceptible strain. The strain mostly highly resistant to pyrethroids (K-851) dispersed slowly compared with the other resistant strains in experiments with the FC and its blank. When vapor-induced dispersal was relatively low (less than 50%), a trend was still evident towards less dispersal in the K-851 strain than in the Fairbanks strain. Although dispersal in experiments with the FC did not differ significantly from that in experiments with the FC formulation blank, mean percentage dispersal at the end of the experiments was higher with the formulation blanks than with the complete formulations in experiments with the WP and permethrin aerosol.
将来自一个对杀虫剂敏感的田间品系（费尔班克斯）以及四个对拟除虫菊酯类杀虫剂有抗性的田间品系的老龄德国小蠊暴露于氟氯氰菊酯乳油（FC）和制剂空白（不含活性成分的制剂）的蒸汽中。使用费尔班克斯品系和一个对杀虫剂有抗性的田间品系（K - 851）进行了其他拟除虫菊酯类制剂的实验，因为在使用FC进行的实验中，这些品系体现了品系间最大的差异。在这些实验中，我使用了氟氯氰菊酯可湿性粉剂（WP）及其空白、氟氯氰菊酯乳油（EC）以及氯菊酯气雾剂及其空白。FC及其空白的蒸汽导致了最迅速的扩散。WP、EC和气雾剂制剂的蒸汽所诱导的扩散程度较低且变化不定。一般来说，抗性品系中的扩散反应比敏感品系中的少。在使用FC及其空白进行的实验中，对拟除虫菊酯类杀虫剂抗性最强的品系（K - 851）与其他抗性品系相比扩散缓慢。当蒸汽诱导的扩散相对较低（小于50%）时，K - 851品系的扩散仍明显少于费尔班克斯品系。尽管使用FC进行的实验中的扩散与使用FC制剂空白进行的实验中的扩散没有显著差异，但在使用WP和氯菊酯气雾剂进行的实验中，实验结束时制剂空白的平均扩散百分比高于完整制剂的平均扩散百分比。
