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Degree of Injury Caused by Larva of Pyrausta panopealis Walker (Lepidoptera: Pyralidae) in Green Perilla Polyvinyl House at Chungnam Province

충남지역 잎들깨 시설하우스에서 들깨잎말이명나방 유충의 가해양상

  • Choi, Yong-Seok (Bioenvironment Research Division, Chungnam Agricultural Research & Extention Services Yesan) ;
  • Park, Deok-Gi (Byeinsect Co. LTD., Kongju National Univ.) ;
  • Kim, Byung-Ryun (Bioenvironment Research Division, Chungnam Agricultural Research & Extention Services Yesan) ;
  • Han, Kwang-Seop (Bioenvironment Research Division, Chungnam Agricultural Research & Extention Services Yesan) ;
  • Youn, Young-Nam (Department of Applied Biology, Chungnam National Univ.) ;
  • Choe, Kwang-Ryul (Department of Applied Biology, Chungnam National Univ.)
  • Published : 2007.08.30

Abstract

This study was conducted to explain degree of injury caused by P. panopealis larva which is the key component to develop economic injury level or control threshold in green perilla and was carried out in polyvinyl houses at Yuseong Daejeon, Geumsan and Yesan Chungnam from 2004 to 2006. Of 5 major pests in green perilla polyvinyl house, P. panopealis larva injured green perilla leaf by 48.5% on average under no insecticides application. The peak occurrence of P. panopealis adult was early August and late September in 2004 and 2005 studies. The feeding amount of P. panopealis larva among 1st to 3rd instar was not different, but from the 4th instar the feeding amount greatly increased and this result was consistent with daily feeding experiment in which the amount greatly increased from seventh day. The degree of injury which was investigated with different larval infestation levels showed that the degree of injury increased a little but was not dim ε rent significantly as the density increased. The density of P. panopealis larva in damaged green perilla plant was less than three individuals/plant. This result indicates that P. panopealis adult lays egg on green perilla leaf dispersedly and larva hatched from egg injures only the leaf which egg is layed. These preliminary data seems to be very useful to design economic injury level and control threshold studies for P. panopealis in green perilla polyvinyl house.

본 연구는 시설 잎들깨재배시 진딧물과 함께 가장 피해를 많이 주는 들깨잎말이명나방 유충의 피해양상을 밝힘으로써 들깨잎말이명나방의 경제적피해수준과 요방제 수준을 설정하기 위한 정량적 기준을 설정하기 위하여 대전 유성의 충남농업기술원(구)과 충남 예산의 충남농업기술원 포장, 충남 금산의 농가포장에서 2004년부터 2006년에 걸쳐 수행하였다. 잎들깨를 가해하는 주요해충은 4목 5과 6종이었으며, 이중 들깨잎말이명나방의 피해가 가장 심하였다. 들깨잎말이명나방은 무방제시 48.5%의 피해엽율로 들깨진딧물과 함께 가장 피해가 높았으며 2004년과 2005년에 걸친 들깨잎말이명나방 성충의 황색트랩 조사결과 8월 상순과 9월 하순에 발생최성기를 보였다. 들깨잎말이명나방 유충의 발육단계별 섭식량은 1령부터 3령까지 고른 섭식량을 보였으나 4령은 3령보다 약 3.7배 증가한 $3.71 cm^2$의 섭식량을 보였다. 들깨잎말이명나방의 발육기간이 가장 짧은 $27.5^{\circ}C$에서 알에서 부화한 유충의 섭식량을 매일 조사한 결과, 4 령충으로 탈피하는 시기인 7 째부터 섭식량이 급격히 증가하였다. 10주를 1반복으로 하여 들깨잎말이명나방 1령충을 1마리부터 7마리까지 접종한 후 피해주율과 피해엽율을 조사하였다. 1마리 접종구와 3마리 접종구간의 차이는 거의 없었으나 4마리 접종구부터 피해주율과 피해엽율이 증가하였으나 큰 차이를 보이지는 않았다. 또한 실제포장에서 피해받은 주의 유충밀도를 조사한 결과, 피해주에 대하여 3마리 이상의 유충은 조사되지 않았다. 따라서 들깨잎말이명나방 성충은 잎들깨에 산발적으로 산란하는 습성을 보이며 알에서 부화한 유충은 이동하지 않고 그 주에서 피해를 주는 것으로 판단되며, 본 결과는 들깨잎말이명나방 유충의 경제적피해수준 설정과 요방제수준 설정을 위한 기초자료로써 활용가치가 있을 것으로 판단된다.

Keywords

References

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