Density Fluctuation of Tetranychus urticae and Three Predatory Mite Species(Phytoseiidae) by the Differently Infested Levels

점박이응애와 천적인 3종 이리응애의 접종수준별 밀도 변동

  • 이영인 (안동대학교 농생물학과) ;
  • 권기면 (안동대학교 농생물학과) ;
  • 이순원 (농촌진흥청 대구사과연구소) ;
  • 류하경 (안동대학교 농생물학과) ;
  • 류언하 (농촌진흥청 대구사과연구소)
  • Published : 1997.09.01

Abstract

Comparative studies on suppression possibility with three phytoseiid mite species (An.thly,seiu,sw omersleyi Schicha. A. ,fidIrrc~i.Gs arman and T\ulcornerphlorlrotiiu.s oc~c~idetitaliNs esbit) to the two-spotted spider mite (Te~trrrt~yc.Iir~l~l\ulcorner.i\c .(re Kwh) on kidney bean leaves in field and greenhouse were carried out. In the field experiments with the initial prey -predator ratio of 4 : 1. I0 : I and 20: I . A. ,firllrrcis suppressed successfully the prey populations at all three ratios 17 days after the initial infestation. A. wornc,r-;leyi \uppressed the prey population only at the ratio of 4 : 1, while T. oc~c~ideritcr1iw.s as unable to suppress the prey population at all tested ratios. In the greenhouse experiments with the initial prey-predator ratio of 10: 1, A. jil1ltrci.s could suppress the prey population continuously during the infestation period. A. ~~otnc~r,slceoyuil d suppress the prey population for 13 days after the initial infestation, while T. occie1mttrli.s could suppress the prey population for 8 - 23 days after the initial infestation.