헤어리베치 재배과원에서 해충과 천적의 발생

We investigated the occurrence of major pests, 4 species of moths (Grapholita dimorpha Busck, Carposina sasakii Matsumura, Archips breviplicanus Walsingham, Adoxophyes orana Fischer von Roslerstamm), apple aphid (Aphis spiraecola Patch), two spotted spider mite (Tetranychus urticae Koch) and parasitoids in pear orchard with hairy vetch and cutting weeds in Yesan, Chungnam province during the flowering season and summer depression season of hairy vetch, in 2012 and 2013. The occurrence of 4 species of moths in hairy vetch plot and cutting weeds (major is finger grass, Digitaria sanguinalis, 80%) were little different but in case of apple aphid, the density in hairy vetch plot was just 95 aphids per stem at 20th June but low after then. The density of two spotted spider mite on pear leaf in hairy vetch plot was lower than in cutting weeds plot significantly. The number of parasitoids collected in hairy vetch plot during flowering season (May and June) were 398 and 798 in 2012 and 2013, respectively. The number of parasitoids collected in hairy vetch plot during summer depression season (July and August) were 114 and 172, respectively. But in cutting weeds plot, 9 and 22 in May and June, 8 and 5 in July and August. We didn't know either hairy vetch in pear orchard affected the occurrence of 4 species of moths, apple aphid and two spotted spider mite or not but was acted to be favorable for wasps, the natural enemies on the contrary. The improvement of chemical control systems through the selection of low chemicals to natural enemies with cover and green manure plants would turn effective pest management into a possibility. 배 과원에 심겨진 헤어리베치가 배의 주요해충인 4종 나방류(복숭아순나방, 복숭아심식나방, 사과무늬잎말이나방, 애모무늬잎말이나방), 조팝나무진딧물 및 점박이응애의 발생과 천적인 기생봉류의 발생에 미치는 영향을 평가하기 위하여 수행하였다. 헤어리베치가 심겨진 배 과원과 바랭이가 주요 초종인 일반과원에서 4종 나방류의 발생에는 다소 차이를 보였으나, 조팝나무진딧물은 6월 20일 헤어리베치구에서 신초 당 95마리가 1회 확인되었을 뿐 전체적으로 발생되지 않았다. 배 잎의 점박이응애 밀도는 헤어리베치가 심겨진 배 과원에서 월등히 낮았다. 2012년과 2013년에 조사된 기생봉류의 발생은 헤어리베치의 개화시기에 각각 398마리와 798마리로 일반초생구의 9마리와 22마리보다 월등히 높았고, 하고시기에도 헤어리베치구가 114, 172마리로 일반초생구 8, 5마리보다 월등히 많았다. 헤어리베치는 4종 나방류, 조팝나무진딧물, 점박이응애 발생에 영향을 주지 않으며 오히려 천적인 기생봉류에 유리하게 작용하여 배 과원의 피복 및 녹비작물로써 이용가능성이 높으므로, 천적에 저독성 농약선발을 통해 농약방제 체계를 개선한다면 보다 효과적인 해충관리가 가능할 것이다.