Seasonal Occurrence and Attraction of Egg Parasitoid of Bugs, Ooencyrtus nezarae, to Aggregation Pheromone of Bean Bug, Riptortus clavatus

톱다리개미허리노린재의 집합페로몬에 의한 노린재류의 난기생봉 Ooencyrtus nezarae의 유인과 발생소장

  • Huh Wan (Institute of Agriculture and Life Sciences, Gyeongsang National University) ;
  • Park Chung-Gyoo (Institute of Agriculture and Life Sciences, Gyeongsang National University)
  • 허완 (경상대학교 농업생명과학대학) ;
  • 박정규 (농업생명과학연구원)
  • Published : 2005.06.01

Abstract

Seasonal occurrence of the egg parasitoid of bugs, Ooencyrtus nezarae (Hymenoptera: Encyrtidae), was monitored at soybean fields and university campus using traps baited with aggregation pheromone of bean bug, Riptortus clavatus, in Jinju, Gyeongnam province, Korea. The female O. nezarae captured at university campus in 2003 and 2004 was 317.5 and 103.4 times as many as males, respectively, and it was 12.6 times at soybean field in 2004. The female began to occur from late August, showing its peak around September 20 at soybean field in 2004. At university campus in 2003 and 2004, the female began to occur from mid or late August, and showed its peak early or mid September. At the two monitoring sites the catches of female sharply declined after October The E2HZ3H only showed attractiveness to O. nezarae, among three components of the aggregation pheromone of bean bug, (E)-2-hexenyl (Z)-3-hexenoate (E2HZ3H), (E)-2-hexenyl (E)-2-hexenoate (E2HE2H), and myristyl isobutyrate (MI). A mixture in a ratio of 20:20:10 or 16.7:16.7:16.7 of E2HZ3H:E2HE2H:MI attracted significantly more females than the mixture of 7:36:7 ratio did. This higher attractiveness of the former two blends may be attributed to the higher amounts of E2HZ3H in the blends.

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