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Effect of temperature on the toxicity of S-bioallethrin andcypermethrin to susceptible and kdr-resistant strains of Blattella germanica (L.) (Dictyoptera: Blattellidae)

Published online by Cambridge University Press:  10 July 2009

Jeffrey G. Scott
Jeffrey G. Scott
Affiliation:
Insect Toxicology Laboratory, Department of Entomology, Cornell University, Ithaca, New York 14853, USA
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Abstract

The toxicity of two pyrethroid insecticides, S-bioallethrin and cypermethrin, was investigated over time at 12, 25 and 31°C in susceptible and kdr resistant strains of Blattella germanica (L.). Both strains showed a negative temperature coefficient (i.e., greater kill with decreasing temperature) for S-bioallethrin. The susceptible strain had a negative temperature coefficient for knockdown, but a positive temperature coefficient for mortality towards cypermethrin. The resistant strain had a negative temperature coefficient towards cypermethrin at all times. Resistance to S-bioallethrin was generally greatest at 25°C initially, although the difference between temperatures and the level of resistance diminished with time. Resistance to cypermethrin was significantly less at 12°C than at 25 or 31°C.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 77 , Issue 3 , September 1987 , pp. 431 - 435
Copyright
Copyright © Cambridge University Press 1987

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