Toxicity and Transmission of Thiamethoxam in the Asian Subterranean Termite Coptotermes gestroi (Isoptera: Rhinotermitidae)

M. Acda

Published 2014 in Journal of Insect Science

ABSTRACT

Abstract The toxicity and horizontal transmission of thiamethoxam was evaluated in the workers of the Asian subterranean termite Coptotermes gestroi Wasmann (Isoptera: Rhinotermitidae). Brief exposure to sand treated with thiamethoxam at concentration ranging from 0.25 to 50 µg/ml resulted in a dose-dependent mortality in C. gestroi . Sand treated with 50 µg/ml thiamethoxam resulted in very high mortality within 30–60 min of exposure. Termites exposed to sand treated with 0.25–25 µg/ml exhibited delayed toxicity and nonrepellency in C. gestroi . A horizontal transmission study using 25 µg/ml of thiamethoxam at donor–recipient ratio of at least 2:5 (treated:untreated) indicated that thiamethoxam can be transferred between exposed and unexposed workers, resulting in significant termite mortality in unexposed termites within 1–3 d post exposure.

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