A bioassay for screening the toxicity of baits to control the red imported fire ant
Author of the article:ZHANG Zhen1, 2** HE Xiao-Fang1***
Author's Workplace：1. Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China; 2. China Tobacco Guangdong Industrial Co. Ltd, Guangzhou, 510620, Chian
Key Words：red imported fire ant, contact toxicity, oral toxicity
Abstract：[Objectives] To control the red imported fire ant, Solenopsis invicta, toxicities of four insecticides were evaluate and screenedin laboratory. [Methods] The contact and oral toxicities of phoxim, beta-cypermethrin, emamectin benzoate and abamectin against worker ants of the red imported fire ant, and their toxic regression equations, were evaluated in the laboratory. Totally, five concentrations and four treatment duration (12, 24, 48 and 72 h) for each insecticide were used to test by five repeats. [Results] The results show that the all the corrected mortalities were increasing by increasing of the concentrations and the treatment durations among the four insecticides. The minimum LC50 values of phoxim and emamectin benzoate were 3.42×10-4 mg/mL and 2.56×10-5 mg/mL, respectively. [Conclusion] The results suggest that the red imported fire ant is sensitive to phoxim and banleptm. Banleptm, a chemically modified avermectin, is not only be transferred by between worker ants, but also shows a promising prospects as an orally ingested bait.