Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Overwintering Sites and Winter Mortality of Tetranychus urticae in an Apple Orchard in Korea

사과원에서 점박이응애의 월동처와 월동 사충률

  • Lee, Jung-Sup (Protected Horticulture Experment Institution, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Lee, Sun-Young (Apple Research Institution, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Do, Yun-Su (Apple Research Institution, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Lee, Seong Chan (Protected Horticulture Experment Institution, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Cho, Il Whan (Protected Horticulture Experment Institution, National Institute of Horticultural & Herbal Science, Rural Development Administration)
  • 이중섭 (국립원예특작과학원 시설원예연구소) ;
  • 이선영 (국립원예특작과학원 사과연구소) ;
  • 도윤수 (국립원예특작과학원 사과연구소) ;
  • 이성찬 (국립원예특작과학원 시설원예연구소) ;
  • 조일환 (국립원예특작과학원 시설원예연구소)
  • Received : 2015.09.01
  • Accepted : 2015.10.08
  • Published : 2015.12.01
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Abstract

The two-spotted spider mite Tetranychus urticae Koch, overwinters in apple culture areas of apple orchards. The mite overwinters in various places on the apple trees, usually in groups of 5-15 females. Overwintering females were mostly found in bark crevices with the hibernation cocoons of the oriental fruit moth, Grapholita molesta Busck. They were also found in small crevices of the bark, and in pedicels left after fruit harvesting. Furthermore, overwintering females were found on rough bark at the bases of buds and spurs, on small limbs and twigs, and in limb crevices and forks. Empty scales of dead diaspidids and coccids, as well as cocoons of lacewings and mummies of parasitized aphids sporadically found on trees, were found to be less common overwintering sites for females of the two-spotted spider mite. In two successive years, the mortality of overwintering females was very high, reaching approximately 72 and 80%. This could be due to the low temperature of winter season in Korea and the low cold tolerance of the mite.

사과 재배포장에서 점박이응애(Tetranychus urticae Koch)의 월동은 사과나무의 여러 장소에서 5~15마리의 성충 암컷이 개체군을 형성하여 월동하는 것으로 밝혀졌다. 월동중인 암컷들은 대부분 복숭아순나방(Grapholita molesta) 유충의 고치가 있는 조피사이의 갈라진 틈에서도 발견되었으며, 부주지 상에 형성된 좁은 조피틈과 과실 수확 후 남아있는 꽃자루에서도 발견되었으나 월동 개체수는 매우 적었다. 또한, 월동중인 암컷들은 결과지의 기부에 형성된 거친껍질 및 눈의 기부, 여러 작은가지의 분지부위 좁은틈에서도 발견되었다. 한편, 수체상에 형성된 일부 점박이응애 월동장소로 죽은 개각충속, 깍지벌레 빈껍질속, 진딧물의 미라속에서도 발견되었는데, 이들 장소에서의 월동 응애수는 매우 적었다. 2년에 걸쳐 수행된 본 연구에서 점박이응애의 월동중 암컷 성충의 사망률은 평균 72~80%로 매우 높았으며, 이는 이들 응애가 겨울 동안 추위에 견디는 저항력이 낮기 때문으로 판단되었다.

Keywords

References

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