Studios on the Parasites of the Rice Planthoppers I. Egg Parasitism Anagrus nr. flaveolus WATERHOUSB (Hymenoptera : Mymmaridae) on the Rice Planthoppers

멸구 매미충의 기생성 천적에 관한 연구 I. Anagrus nr. flaveolus의 멸구류 난기생에 관하여

  • Kim J.P. (Research Bureau, Gyeongnam Provincial O.R.D.) ;
  • Yoo C.Y. (Research Bureau, Gyeongnam Provincial O.R.D.) ;
  • Kim C.H. (College of Agricultural, Gyeongsang National University)
  • 김정부 (경상남도농촌진흥원시험국) ;
  • 유창영 (경상남도농촌진흥원시험국) ;
  • 김창효 (경상대학교 농과대학)
  • Published : 1982.06.01


The mymarids egg parasite of rice planthopper, Anagrus nr. flaveolus, were investigated to know their parasitic activities after overwitering in the paddy banks and barley fields, their host preferences and seasonal variations in the pesticide sprayed and unsprayed paddy fields of Gyeongnam province O.R.D. at Jinju from 1977 to 1979. The parasitic activities of Anagrus nr. flaveolus after overwintering in the paddy banks were high early in April and tended to decrease remarkably since mid-April by moving to the barley fields. The parasitic rate of Anagrus nr. flavelous was $47.2\~88\%$ between middle and late in April, the peak of egg deposition period. Anagrus nr. flaveolus parasitized Laodelphax striatellus, Nilaparvata lugens, and Sogatella furcifera, but didn't attack the eggs of Nephotettix cincticeps in the paddy fields. High preference was observed with Laodelphax steriatellus. The parasitic activities of Anagrus nr. flaveolus in the pesticide sprayed paddy fields were high in early July and from late August to early September. The parasitic rate in the pesticide unsprayed fields were higher than those of sprayed fields during the pesticide spraying period, from July to August and parasitic activities were active from October to before coming winter.