Evaluation of Trebon (ethofenprox) for insecticidal efficacy against mosquito larvae and on non-target organisms

Ethofenprox (Trebon), a new compound, was evaluated against three species of mosquito larvae in the laboratory. Larval LC50 values revealed that Culex quinquefasciatus was more susceptible than Ae. aegypti and An. stephensi. The residual toxicity of Trebon was studied against culicine larvae in the rice agroecosystem at rates ranging from 0.05 to 0.2 kg ai/ha. Effective control was obtained for even beyond five weeks at the larvicidal rate of 0.2 kg ai/ha. Trebon is not safe to nontarget aquatic organisms.