Effects of Some Pesticides on Development of Ascaris suum Eggs
2014
Yu, Y.M., Chungnam National University, Daejeon, Republic of Korea | Kim, J.W., Department of Environmental Horticulture, The University of Seoul, Seoul, Republic of Korea | Na, W.S., Department of Environmental Horticulture, The University of Seoul, Seoul, Republic of Korea | Youn, Y.N., Chungnam National University, Daejeon, Republic of Korea | Choi, I.W., Chungnam National University School of Medicine, Daejeon, Republic of Korea | Lee, Y.H., Chungnam National University School of Medicine, Daejeon, Republic of Korea
To evaluate the effects of pesticides to parasite eggs, Ascaris suum eggs were incubated with 5 different pesticides (1:1,500-1:2,000 dilutions of 2% emamectin benzoate, 5% spinetoram, 5% indoxacarb, 1% deltamethrin, and 5% flufenoxuron; all v/v) at 20¡� for 6 weeks, and microscopically evaluated the egg survival and development on a weekly basis. The survival rate of A. suum eggs incubated in normal saline (control eggs) was 90¡¾3% at 6 weeks. However, the survival rates of eggs treated with pesticides were 75-85% at this time, thus significantly lower than the control value. Larval development in control eggs commenced at 3 weeks, and 73¡¾3% of eggs had internal larvae at 6 weeks. Larvae were evident in pesticide-treated eggs at 3-4 weeks, and the proportions of eggs carrying larvae at 6 weeks (36¡¾3%-54¡¾3%) were significantly lower than that of the control group. Thus, pesticides tested at levels similar to those used in agricultural practices exhibited low-level ovicidal activity and delayed embryogenesis of A. suum eggs, although some differences were evident among the tested pesticides.
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