Selective toxicity of spirodiclofen and fluacrypyrim+tetradifon to the predatory Mite, Phytoseiulus persimilis (Acarina: Phytoseiidae) and the tea red spider mite, Tetranychus kanzawai (Acarina: Tetranychidae)

칠레이리응애와 차응애에 대한 spirodiclofen과 fluacrypyrim+tetradifon의 선택독성

  • Seo, Sang-Gi (Department of Applied Biology, Sunchon National University) ;
  • Park, Jong-Dae (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Seon-Gon (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Do-Ik (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Sang-Soo (Department of Applied Biology, Sunchon National University)
  • Published : 2004.03.30

Abstract

The selective toxicity of spirodiclofen and fluacrypyrim+tetradifon to the predatory mite, Phytoseiulus persimilis and the tea red spider mite, Tetranychus kanzawai was evaluated. The bean leaf discs with adult females or eggs of both species were sprayed with several concentrations of spirodiclofen or fluacrypyrim+tetradifon. Spirodiclofen and fluacrypyrim+tetradifon were much less toxic to P. persimilis than to T. kanzawai. Although the survival rate of adult females of P. persimilis tended to decrease with increasing concentrations of spirodiclofen, 92-68% of predators survived at concentrations of 22.5-180 ppm. Likewise, reproduction was reduced with increasing spirodiclofen concentration. Spirodiclofen did not affect the hatch of P. persimilis eggs. Survival of immature predators decreased with increasing spirodiclofen concentration, however, 88-20% of immature predators reached adulthood at 22.5-90 ppm. In the case of fluacrypyrim+tetradifon, the survival rate of adult females of P. persimilis tended to decrease with increasing concentrations of fluacrypyrim+tetradifon. However, 94-72% of predators remained alive at concentrations of 22.5-180 ppm. Likewise, reproduction was reduced with increasing fluacrypyrim+tetradifon concentration. Fluracypyrim+tetradifon did not affect the hatch of P. persimilis eggs. Survival of immature predators decreased with increasing fluacrypyrim+tetradifon concentration, however, 100-86% of immature predators reached adulthood at 22.5-180 ppm. Based on the results, spirodiclofen and fluacrypyrim+tetradifon appeared to be promising candidates for use in integrated mite management programs where P. persimilis is the major natural enemy.

칠레이리응애와 차응애에 대하여 spirodiclofen과 fluacrypyrim+tetradifon의 독성을 비교하기 위하여 강낭콩 leaf disc에 각 응애 종의 자성충 또는 난을 접종하고 각 약제를 농도별로 살포한 결과, spirodiclofen과 fluacrypyrim+tetradifon은 차응애보다 칠레이리응애에 대하여 독성이 매우 낮았다. Spirodiclofen을 처리한 결과 칠레이리응애 자성충은 처리 농도의 증가에 따라 생존율이 감소하였으나, $22.5\sim180$ ppm 에서 92-68%가 생존하였으며, 산란수도 농도 증가에 따라 감소하였다. 모든 처리 농도에서 칠레이리응애 난의 부화에는 영향이 없었다. 유 약충의 생존율은 농도 증가에 따라 감소하였으나 $22.5\sim90$ ppm에서 88-20%가 성충으로 되었다. Fluacrypyrim+tetradifon을 처리하였을 경우, 칠레이리응애 자성충은 처리 농도가 증가할수록 생존율 이 감소하였지만, 22.5-180 ppm 에서 94-72%가 생존하였으며, 산란수도 농도 증가에 따라 감소하였다. 모든 처리 농도에서 칠레이리응애 난의 부화에는 영향이 없었다. 약충의 생존율은 농도 증가에 따라 감소하였으나, $22.5\sim180$ ppm에서$100\sim86%$가 성충태로 도달하였다. 이상의 결과에서 spirodiclofen과 fluacrypyrim+tetradifon은 차응애의 종합관리에서 칠레이리응애와 함께 이용할 수 있을 것으로 생각된다.

Keywords

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