생물적 방제인자로서의 무당벌레(Harmonia axyridis): I. 포식행동과 포식력

The Asian Ladybird, Harmonia axyridis, as Biological Control Agents: I. Predacious Behavior and Feeding Ability

  • 서미자 (충남대학교 농과대학 응용생물화학식품학부) ;
  • 윤영남 (충남대학교 농과대학 응용생물화학식품학부)
  • 발행 : 2000.08.01

초록

무당벌레(Harmonia axyridis)의 기본적인 행동학적 특성을 살펴보았다. 무당벌레는 먹이인 진딧물을 탐색할 때에 주로 작은턱수염을 이용하여 접촉감각에 의한 기주탐색을 하고 있다. 다른 한편으로는 무당벌레가 복숭아혹진딧물을 공격하게 되면 공격받은 진딧물 주위의 다른 복숭아혹진딧물은 근처의 잎으로 이동하거나 아래로 떨어져 도망하는 방어기작이 관찰되었다. 무당벌레가 먹이탐색을 위하여 이동하는 시간과 먹이를 잡고 섭식하는 시간은 무당벌레의 발육단계에 따란 현저한 차이를 나타내고 있었다. 무당벌레의 포식력을 조사한 결과 1일 평균 복숭아혹 진딧물은 약 120마리, 목화진딧물은 약 257마리를 섭식하였다. 오이 잎과 토마토 잎에 산란된 온실가루이 알은 무당벌레 3령충의 먹이로 제공하였을 경우 오이 잎에서는 2,420개, 토마토 잎에서는 2,750개의 알을 섭식하였으나, 진딧물을 제공한 무당벌레 유충과는 달리 정상적인 발육이 이루어지지 않았다.

The Asian ladybird, Harmonia axyridis, might be distinguished in biological control agents for the several aphid species in the greenhouses as well as in the fields. Therefore, feeding behavior and predacious capability characteristics were observed. When ladybirds are searching for aphids as their preys, they use the maxillary palpus as contact reception. Otherwise, most of aphids escape from walking or chewing ladybird to other place (mainly move to near-by leaf, or fall down to the under-leaf or ground) instead of plant sucking. Consumed time of ladybirds for searching and feeding prey were significantly different and dependent on their development stage. The ladybird adults ate about 120 green peach aphids and 257 cotton aphids per day. The 3rd instar of ladybirds ate 2,420 and 2,750 eggs of greenhouse whitefly on the cucumber and tomato leaf, respectively, as well. However, ladybird instars taken greenhouse whitefly eggs could not continuously develope to adult, on the other hand, ladybirds taken aphids were normal condition.

키워드

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