Parasites, Hosts and Diseases

The Korea Society for Parasitology and Tropical Medicine (대한기생충학·열대의학회)
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Effects of Some Pesticides on Development of Ascaris suum Eggs

  • Yu, Yong-Man (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Kim, Jin-Won (Department of Environmental Horticulture, The University of Seoul) ;
  • Na, Won-Seok (Department of Environmental Horticulture, The University of Seoul) ;
  • Youn, Young-Nam (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Choi, In-Wook (Department of Infection Biology, Chungnam National University School of Medicine) ;
  • Lee, Young-Ha (Department of Infection Biology, Chungnam National University School of Medicine)
  • Received : 2013.09.27
  • Accepted : 2013.12.27
  • Published : 2014.02.28
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Abstract

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 $20^{\circ}C$ 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 $90{\pm}3%$ 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 $73{\pm}3%$ 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 ($36{\pm}3%-54{\pm}3%$) 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.

Keywords

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