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Ecological Characteristics of 28-spotted Larger Lady Beetle, Henosepilachna vigintioctomaculata (Motschulsky) (Coleoptera: Coccinellidae) and Its Seasonal Fluctuation in Gangneung, Korea

큰이십팔점박이무당벌레(Henosepilachna vigintioctomaculata (Motschulsky))의 생태적 특성 및 강릉지역 발생소장

  • Kwon, Min (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Ju-Il (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Jeom-Soon (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration)
  • 권민 (농촌진흥청 국립식량과학원 고령지농업연구센터) ;
  • 김주일 (농촌진흥청 국립식량과학원 고령지농업연구센터) ;
  • 김점순 (농촌진흥청 국립식량과학원 고령지농업연구센터)
  • Received : 2010.07.16
  • Accepted : 2010.09.08
  • Published : 2010.09.30

Abstract

The seasonal fluctuation of the large 28-spotted lady beetle, Henosepilachna vigintioctomaculata (Motschulsky), was observed in potato fields of Gangneung region, Gangwondo Province. The effects of their leaf consumption over a 24 hour period and developmental periods by different temperatures were investigated, and then the developmental threshold (DT) and effective cumulative temperature (ET) of each stage were calculated. Various developmental stages of H. vigintioctomaculata were captured in the fields from May to September, with three peaks in late May, late June, and late August. Leaf consumption by larval stages increased with the development of instar. The 4th instar larvae consumed potato leaves much more than other stages. Egg hatchability and emergence rate of H. vigintioctomaculata were lower at $10^{\circ}C$ and $30^{\circ}C$, but higher at around $20{\sim}23^{\circ}C$. The developmental periods of each stage became shorter as temperature increased; 90 days at $10^{\circ}C$, 40 days at $20^{\circ}C$ and 25 days at $25^{\circ}C$. Base on developmental velocity to temperature, calculated DT and ET were $7.3^{\circ}C$ and 83.

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