Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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The Occurrence of Rice Leaf-folder, Cnaphalocrocis medinalis (Lepidoptera : Crambidae) in Suwon and its Responses to Insecticides

혹명나방 개체군의 수원지역 발생 패턴 및 몇가지 약제에 대한 반응

  • Park, Hong-Hyun (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Cho, Jum-Rae (Planning and Coordination Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Park, Chang-Gyu (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Kwang-Ho (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Goh, Hyun-Gwan (International Agriculture R&D Team, Technology Cooperation Bureau, Rural Development Administration) ;
  • Lee, Sang-Guei (Crop Protection Division, Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
  • 박홍현 (농촌진흥청 국립농업과학원 농업생물부 작물보호과) ;
  • 조점래 (농촌진흥청 국립농업과학원 기획조정과) ;
  • 박창규 (농촌진흥청 국립농업과학원 농업생물부 작물보호과) ;
  • 김광호 (농촌진흥청 국립농업과학원 농업생물부 작물보호과) ;
  • 고현관 (농촌진흥청 기술협력국 국외농업기술팀) ;
  • 이상계 (농촌진흥청 국립농업과학원 농업생물부 작물보호과)
  • Received : 2010.08.02
  • Accepted : 2010.09.08
  • Published : 2010.09.30
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Abstract

This paper presents the occurrence and damage characteristics of the rice leaf-folder populations in the paddy fields of Dangsu-dong, Suwon from 2004 to 2007, and also reports the insecticide response of rice leaf-folder populations, which were collected from 2005 to 2006 in Korea and Vietnam. Laboratory measurements of the head capsule width and body length data enabled the identification of the rice leaf-folder larva stages collected in the field. The rice leaf-folder population in Suwon from 2004 to 2007 has a clear pattern consisting of two different group: the low and high density years. During the low density years (2004 and 2006), only one adult peak was noted in late August, with the damaged-hill percent less than 10% in late July, and the damaged-leaf percent around 2% in September. In contrast, during the high density years (2005 and 2007), two adult peaks were noted in early August and mid-September, with the damaged-hill percent was around 30% in late July, and the damaged-leaf percent 15 to 30% in September, which was beyond the economic injury level of rice leaf-folder. High correlations existed between the occurrence of rice leaf-folder in late July and early August and damages to rice during September. Based on these results, we suggest that the information on the rice leaf-folder population monitored by the adult density or damaged-hill percent in late July and early August would be very useful for predicting the damages later in the season for aiding in decision-making for timely control. In addition, the regional populations of rice leaf-folder showed the similar responses to the insecticides tested: high susceptibility to IGRs (tebufenozide and methoxyfenozide) and organophosphates (chlorpyrifos-methyl, pyridaphenthion), but relatively low to cartap.

연구는 2004년부터 2007년까지 수원지역에서 혹명나방 발생과 피해 특성들 및 우리나라와 베트남에서 채집한 개체군들이 몇 가지 약제에 대한 반응을 조사하였다. 포장에서 채집한 유충들의 발육단계는 본 연구의 실내사육충을 대상으로 측정한 두폭과 체장자료를 통해 구분이 가능하였다. 2004년부터 2007년까지 벼 포장에서 조사된 혹명나방은 발생이 많거나 적은 해로 패턴이 분명하게 구분되었다. 발생이 적은 해(2004년 및 2006년)에는 성충이 한 번의 발생 최성기(8월 하순)를 가졌고, 7월 하순의 피해주율이 10% 미만이었으며, 9월 동안에 피해엽률이 2% 수준이었다. 하지만 발생이 많은 해(2005년 및 2007년)에는 두 번의 성충 발생 최성기(8월 초순과 9월 중순)를 가졌고, 피해주율도 7월 하순에 약 30%에 달하였으며, 9월동안에 피해엽률이 15~30%로 경제적 피해수준을 넘었다. 특히 7월 하순과 8월 상순에 조사된 성충 밀도나 피해주율의 크기는 9월에 발생하는 피해규모와 밀접하게 정의 상관이 있었다. 따라서 본 연구결과로 볼 때 7월 하순과 8월 상순에 혹명나방 성충의 발생 및 벼 피해에 관한 예찰정보는 벼 생육후기의 피해예측 및 방제적기 선정에 활용할 수 있을 것으로 여겨진다. 또한 우리나라와 베트남에서 채집한 혹명나방에 대한 약제반응은 두 지역 채집계통에서 모두 IGR계인 tebufenozide, methoxyfenozide나 유기인계인 chlorpyrifos-methyl, pyridaphenthion에는 매우 높은 감수성을 보였으나, 칼탑계인 cartap에는 약제 감수성 정도가 다소 낮았다.

Keywords

References

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