Analysis of Spatial Coincidence of Thrips and Orius sauteri on Greenhouse Eggplants

하우스가지에서 애꽃노린재 Orius sauteri Poppius를 이용한 총채벌레류 방제 및 두 개체군의 공간분포와 공존분석

  • 송정흡 (제주도농업기술원 농업환경과) ;
  • 김수남 (제주도농업기술원 농업환경과) ;
  • 이광석 (제주도농업기술원 농업환경과) ;
  • 한원탁 (제주도농업기술원 농업환경과)
  • Published : 2002.03.01

Abstract

Biological control of thrips with a predatory bug species, Orius sauteri Poppius, was evaluated in an eggplant greenhouse, To study the biological control strategy of thrips. three Plots were established: Orius sauteri released plot without pesticide treatment (NRT), pesticide treated plot (PAT), and natural enemy removed plot (RNT) The nymphs of O. sauteri were found on the upper side of leaves in NRT at 21 days after the first release of O. sauteri. The density of thrips were dropped and maintained at lower level in NRT than in RNT. Average damage index of NRT, PAT and RNT was 1.35, 1.21 and 2.90 and the percentage of damaged fruit ratio of those was 70.3, 68.6 and 99.0%, respectively. The damage index and percentage of damaged fruit in NRT were slightly higher than those of PAT, but much lower than in RNT. Taylor's band Iwao's $\beta$ were greater than 1 for both populations. indicating aggregated distribution. Spatial coincidence index of O. sauteri was high most of the time even at low densities of both populations. The refuge index for thrips decreased as O. sauteri density increased. Results of this study suggest that O. sauteri is a promising natural enemy for thrips control on eggplant.

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