Natural Enemies of Citrus Red Mite, Panonychus citri McGREGOR, and Seasonal Occurrence of Major Predators on Yuzu tree (Citrus Junos)

유자에서 귤응애의 천적종류와 주요종의 발생소장

  • 김규진 (전남대학교 농과대학 농생물학과) ;
  • 최덕수 (전남농업기술원 난지과수시험장)
  • Published : 2000.04.01

Abstract

This studies was carried out to investigate the natural enemies of citrus red mite, pononychus citri and seasonal occurrence of its major beneficial insects in Yuzu groves (Chonnam province) from 1996 to 1998. Natural enemies against citrus red mite were 9 species including Oligota kashmirica benifica, 0. yasumatsui, Stethorus punctillum, Chrysopa pallens, Propylea japonica, Orius sauteri, Scolothrips takahashii, Amblyseius womersleyi and one unidentified species of thrips (Family: Phlaeothripidae). Among them, Oligota kashmirica benzficu and Stethorus punctillum were found to be dominant species. 0 . kushmirica henifica had 4-5 generations from middle May to middle November with peak in early September. S. punctillum had 3 generations from late May to late October with peak of late June to middle July. Population dynamics between predator ( 0 . kushmiricu benifica and S. punctillum) and prey (Panonychus citri) were quite well synchronized until September but predator density was decreased abruptly after October.

유자과원에 발생하는 주요해충인 귤응애의 생물적 방제를 위해 천적의 종류 및 주요 포식성 천적의 시기별 발생량을 '96년부터 '98년까지 3년동안 전남 고흥지역에서 조사하였다. 귤응애의 천적으로는 Oligota kashimirica benifica, 깨알반날개(O. yasumatsui), 꼬마무당벌래(Stethorus punctillum), 칠성풀잠자리붙이 (Chrysopa pallens), 꼬마남생이무당벌레(Propylea japonica), 애꽃노린재(Orius sauteri), 응애총채벌레(Scolothrips takahashii), 긴털이리응애(Amblyseius womersleyi) 그리고 관총채벌레류 1종으로 총 5목 7과 9종이 조사되었으며, 이 중 우점천적은 깨알반날개류와 꼬마 무당벌레였다. 유자과원에서 깨알반날개류는 5월 중순부터 11월 중순까지 발생하며 년 4~5세대를 경과하였고, 4세대인 9월 상순에 연중 최대발생량을 보였다. 꼬마무당별레는 5월 하순부터 10월 하순까지 발생하며 년 3세대 경과하였고 6월 하순~7월 중순에 발생최성기를 보였다. 먹이인 귤응애와 포식자인 천적의 시기별 밀도변동을 볼 때 9월까지는 귤응애의 발생상황에 따라서 포식자의 발생밀도도 증감하는 시기적 일치 경향을 보였으나, 10월 이후 귤응애의 밀도가 증가하는 반면에 포식자의 밀도는 급격히 감소하여 불일치 현상이 나타났다.

Keywords

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