Florida Entomologist (1998) 81, 193-201

Steven M. Valles, Hussein Sánchez-Arroyo, Richard J. Brenner and Philip G. Koehler (1998)
Temperature effects on lambda-cyhalothrin toxicity in insecticide-susceptible and resistant German cockroaches (Dictyoptera : Blattellidae)
Florida Entomologist 81 (2), 193-201
Abstract: Pre- and post-treatment temperature effects on l-cyhalothrin toxicity were determined in insecticide-susceptible and resistant German cockroach, Blattella germanica (L.), strains. Acclimation at 19, 26, or 31°C for 10 days before insecticide treatment had no effect on l-cyhalothrin toxicity in either strain. No differences were observed in aldrin epoxidase and glutathione S-transferase activities when "Orlando" (susceptible) cockroaches were incubated for 10 days at 19, 26, and 31°C. When temperature treatment followed insecticide application, a negative temperature coefficient of toxicity (greater toxicity at lower temperature) toward l-cyhalothrin was observed for the Orlando but not the kdr-type resistant "Village Green" cockroaches. Piperonyl butoxide synergized l-cyhalothrin in "Orlando" cockroaches 3 and 5-fold at 26 and 31°C, respectively. Conversely, piperonyl butoxide pre-treatment did not cause a significant reduction in the LD50 value in the "Village Green" strain regardless of temperature.
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Database assignments for author(s): Steven M. Valles

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Blattella germanica