Translator Disclaimer
1 October 2001 Insecticide Susceptibility in Coptotermes formosanus and Reticulitermes virginicus (Isoptera: Rhinotermitidae)
Author Affiliations +

Lethal time to mortality responses were established for eight insecticides against workers and soldiers of the Formosan subterranean termite, Coptotermes formosanus Shiraki, and workers of Reticulitermes virginicus (Banks). There were significant differences in the tolerance ratios between workers of C. formosanus colonies to all toxicants tested except fipronil. One colony was 16 times more tolerant than another to deltamethrin. C. formosanus soldiers had significant differences in tolerance ratios among colonies exposed to all toxicants except chlorpyrifos. Methoxychlor, permethrin, deltamethrin, and fipronil did not kill soldiers from two, one, one, and three colonies, respectively, within 8 h. Seventy-five percent of R. virginicus colonies were significantly less susceptible than the most susceptible colony to chlordane, methoxychlor, chlorpyrifos, cypermethrin, and fipronil, with 50% of the colonies less susceptible to permethrin and bendiocarb. In 50% of C. formosanus colonies the worker lethal time curves displayed substantial flattening in response to permethrin, and deltamethrin. Lethal time curves for C. formosanus soldiers exposed to chlordane, chlorpyrifos, permethrin, cypermethrin, deltamethrin, and bendiocarb showed substantial flattening. R. virginicus workers demonstrated substantial curve flattening when exposed to chlordane, methoxychlor, chlorpyrifos, deltamethrin, and fipronil. These findings indicate substantial inter-colony and intra-colony differences in susceptibility to insecticides.

Weste L. A. Osbrink, Alan R. Lax, and Richard J. Brenner "Insecticide Susceptibility in Coptotermes formosanus and Reticulitermes virginicus (Isoptera: Rhinotermitidae)," Journal of Economic Entomology 94(5), 1217-1228, (1 October 2001).
Received: 13 October 2000; Accepted: 1 May 2001; Published: 1 October 2001

This article is only available to subscribers.
It is not available for individual sale.

Get copyright permission
Back to Top