님(Neem)과 고삼의 귤굴나방 및 천적 발생에 미치는 영향

Phyllocnistis citrella Stainton (Lepidoptera: Phyllocnisitidae) damages on citrus leaves by making tunnels in the tissue, occurs in summer and autumn flushes of citrus trees mainly after late July. The damaged scars provide a route for the infestation of citrus canker that results in large occurrence of this disease and economic losses. This study was carried out to develop a control measure for P. citrella that can be appled in environment-friendly citrus orchards. We tested formulated phyto-chemicals of Gosam (Sophora angustifolia) and neem trees (Azadirachta indica) and petroleum oil (150x); two phyto-chemicals were mixed with petroleum oil of 1,000x for field application. All treatments were sprayed three times at 7 d interval, and the damage of P. citrella and parasitism were evaluated in randomly selected 5 flushes per citrus tree. There was no control effect when petroleum oil was sprayed alone. The control effects were high in plots of Gosam or neem-based phyto-chemicals mixing with petroleum oil. In addition, it was found that the parasitic wasps of P. citrella were frequently occurred in plots of the untreated control and petroleum oil, and they suppressed the population of P. citrella over the time.