Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Ecological Study of Pachynematus itoi Okutani (Hymenoptera: Tenthredinidae)

낙엽송잎벌 (Pachynematus itoi Okutani) (Hymenoptera: Tenthredinidae)의 생태학적 연구

  • Park, Ji-Doo (Division of Forest Insect Pests and Diseases, Korea Forest Research Institute) ;
  • Park, Il-Kwon (Division of Forest Insect Pests and Diseases, Korea Forest Research Institute)
  • 박지두 (국립산림과학원 산림병해충연구과) ;
  • 박일권 (국립산림과학원 산림병해충연구과)
  • Received : 2010.01.08
  • Accepted : 2010.02.03
  • Published : 2010.03.30
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Abstract

Pachynematus itoi Okutani emerges three times a year, and overwinters as a pre-pupa in cocoon. First emergence of P. itoi was from 7th May to third June. Second and third emergence was from 20th June to 13th July and fourth to 25th August, respectively. Mean oviposited egg number was 59, and egg period was about 9 days. Hatching rate was >90%. Oviposited egg number was the highest in the first needle cluster of short shoot followed by second and third. P. itoi did not oviposit on single needle (long shoot) of Larix leptolepis (Sieb. et Zucc.). Larva had five instars, and larval period was about 20 days. Larva prefer needle cluster of short shoot to single needle of long shoot. Mature larva descended from host tree and pre-pupa in cocoon overwinter at topsoil.

낙엽송잎벌은 1년에 3회 발생하는 전형적인 돌발해충으로, 암갈색 고치 속에서 전용 상태로 월동한다. 성충 우화시기는 강원지방에서 1화기가 5 월 7일~6월 3일, 2화기가 6월 20일~7월 13일, 3화기는 8월 4일~8월 25 일이었다. 산란수는 평균 59개, 난 기간은 평균 9 일정도 되었다. 부화율은 90% 이상이었다. 낙엽송가지 정단부쪽 제1, 제2, 제3 단지엽에 산란수가 많고 단지엽 뒷면 조직에 알을 절반 정도 삽입하여 산란하였다. 유충의 령기는 5령이고 유충기간은 20일 내외이다. 송잎별 유충은 장지엽(신초)보다는 단지엽을 선호하여 섭식하며, 노령유충은 지면으로 낙하하여 낙엽층 속이나, 표토 속에서 고치를 짓고 월동하였다.

Keywords

References

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