Weusedmicrosatellitemarkers to characterize the population structure ofCoptotermes gestroi (Wasmann), an economically important termite species in the tropics. Eighty-Þve colonies were sampled from seven countries (Malaysia, Thailand, Singapore, Indonesia, the Philippines, Taiwan, and the United States [Hawaii]). Ten to 20 workers per colony were genotyped using eight variable microsatellite lo...

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 to...

We investigated interactions between Coptotermes gestroi (Wasmann) (formerly known as C. vastator) and Coptotermes formosanus Shiraki in forced encounters and in foraging competition. In agonistic assays, termites from each species, with a fixed worker-to-soldier ratio of 9:1, were placed in filter paper-lined petri dishes and allowed to interact over a 24-hour period. Coptotermes gestroi suffe...

Coptotermes formosanus Shiraki and C. gestroi (Wasmann) are the most widely distributed species of the genus and occur sympatrically in the subtropics. Results of two bioassays in the current study showed that C. gestroi was more aggressive than C. formosanus. In the petri-dish bioassays, C. gestroi won most of the agonistic encounters over C. formosanus. In the two-dimensional foraging arena ...