미국선녀벌레 천적인 선녀벌레집게벌 대량사육 체계
Mass rearing system for Neodryinus typhlocybae (Hymenoptera: Dryinidae) as a biological control agent of Metcalfa pruinosa
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미국선녀벌레 생물적 방제를 위한 기생성 천적인 선녀 벌레집게벌 대량사육 체계를 구축하였다. 선녀벌레집게벌 고치 생산은 기주인 미국선녀벌레 약충밀도와 기주식물의 재식밀도에 따른 차이를 보였지만, 뽕나무 기주식물 잎 당 평균 5~8개, 주당 평균 70~150개가 생산되었다. 선녀 벌레집게벌 암컷 평균 고치 길이는 6.01~6.46 mm, 수컷은 4.20~4.62 mm로 암수 간 통계적으로 유의미한 차이를 보였으며, 우화 전 고치상태에서의 암수 구분으로 선녀벌레 집게벌을 효과적으로 방사할 수 있을 것으로 보인다. 반야 외조건에서 선녀벌레집게벌 기생률은 평균 13~17%로, 방사 마리수에 따른 기생률 차이는 확인되지 않았으나 방사 마리수가 많을수록 미국선녀벌레 개체군밀도증가율이 낮아지는 경향을 보였다. 선녀벌레집게벌의 성비나 이화성은 기주의 영기에 따라 달라졌다. 기주의 영기가 낮을수록 이화성 비율이 증가했고, 4~5령 약충에 기생시 암컷의 비율이 높게 나타나 대량사육 시 개체조절이 가능할 것으로 판단된다.
Abstract
The mass-rearing system for Neodryinus typhlocybae as a biological control agent of Metcalfa pruinosa was established. Depending on the density of host nymphs and plants, the average number of cocoons produced by the parasitoids was 5-8 and 70-150 cocoons per leaf and sapling of mulberry, respectively. There is a significant difference in cocoon length between females (6.10-6.46mm) and males (4.20-4.62mm). Sex determination of cocoons before emergence will be helpful for efficiently releasing this parasitoid in fields. The parasitic rate of N. typhlocybae at the semi-field condition was on average 13-17%. The release number of this parasitoid did not affect parasitism. Nevertheless, the population growth rate of M. pruinosa was reduced by increasing the release number of N. typhlocybae. The parasitoid offspring’s sex and bivoltine were influenced by the host age. On young host nymphs, the bivoltine portion of parasitoid increased. When parasitized on 4th or 5th nymphs, the offspring’s female ratio of N. typhlocybae increased. This result may be useful for potentially controlling mass rearing production of parasitoid.
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