Egg Parasitism of Scirpophaga incertulas Walker (Lepidoptera: Pyralidae) by Hymenopterous Parasitoids in IRRI Rice Fields

국제미작연구소포장(國際米作硏究所圃場)에 있어서 기주봉(寄生蜂)에 의한 Scirpophaga incertulas의 난기생율(卵寄生率)에 대하여

  • KIM, H.S. (Agricultural Sciences Institute) ;
  • Heinrichs, E.A. (Louisiana Agr. Exp. Sta., Louisiana Sta. Univ. Agr. Center) ;
  • Mylvaganam, P. (Entom, Regional Agri. Research Centre Dept. of Agriculture)
  • 김홍선 (농업기술연구소) ;
  • E.A. 하인리크 ;
  • P. 밀바가남
  • Published : 1986.04.30


We surveyed the IRRI farm to determine the extent of parasitization of yellow stemborer egg masses. The egg masses were randomly collected at weekly intervals from July to October 1984 from rice fields, 15-20 days after transplanting, and brought to the laboratory for collection of emerging parasites. Three species of hymenopterous parasitoids-Tetrasticus schoenobii, Telenomus rowani, and Trichogramma japonicum-were found from 700 egg masses. We introduced a method to calculate percent parasitism as based on parasite biology and behaviour. Among the three species, the combination of T. rowani and T. japonicum was the highest multiparasitization of yellow stem borer egg masses, and T. rowani, a solitary parasite had the highest number based on immature and adult stages counted. However, T. schoenobii may be the most efficient parasite because two to four host eggs are needed to complete the larval period, and it took $10{\sim}14$ days for one generation.