Acute Toxicity of Larval Honeybee to the Most Common Pesticides Detected in Pollen
2016
Im, J., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Chon, K., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Park, K.H., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Choi, Y.S., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Lee, M.L., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Kwon, H., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Kim, J., Central Research Institute, Kyungnong Co., Gyeongju, Republic of Korea | Ryu, S., Central Research Institute, Kyungnong Co., Gyeongju, Republic of Korea | Moon, B.C., National Institute of Agricultural Sciences, Wanju, Republic of Korea | Paik, M.K., National Institute of Agricultural Sciences, Wanju, Republic of Korea
Residual pesticide levels detected in pollen and honey in hive would be important factor in risk assessment of pesticide exposure for adult and larval honeybee. Herein, we investigated the cumulative mortality of larvae on single exposure of the four most common pesticides detected in pollen, and compared its susceptibility with the lethal dose 50% of adult bees. Four pesticides used in this study were acetamiprid, chlorothalonil, coumaphos, and tau-fluvalinate, which were mixed in artificial diet at the average and maximum residual concentrations reported in pollen. Chlorothalonil and tau-fluvailnate at the average levels induced higher cumulative mortality (respectively 25% and 17%) than other tested pesticides. Mortality occurred more quickly after single exposure in larvae treated with the maximum pesticide levels than the average levels. However, cumulative larval mortality did not increase pesticide-dose dependently in a single exposure test of four all pesticides. Based on the lethal dose 50% of pesticides for adult bees, the larval mortality was greater than bee adult mortality. Therefore, larval stage of honeybee might be much more sensitive to pesticides relative to the adult stage.
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