<正>研究了桉叶精油对桑天牛、黄星桑天牛、松墨天牛成虫的室内忌避效果。结果表明，柠檬桉、蓝桉叶精油对三种天牛成虫忌避效果较明显。三种精油中，以柠檬桉叶精油效果最好，用１０％浓度的柠檬按叶精油处理寄主植物，对桑天牛、黄星桑天牛、松墨天牛的忌避时间分别为９、１２、４ｄ；用０．６２５％浓度处理，忌避时间分别为５、１１、１ｄ。窿缘桉叶精油忌避效果不明显。

Laboratory studies were done to determine the repellency effects of essential oil derived from three species of Euealyptus leaf against adults Apriona germari, Psacothea hislaris, and Monochamus alternatus. Results indicated that essential oil of Eucallyptus citriodora and E. globulus had a significant repellency effect. Among three species of essential oil, the essential oil of E.citriodora was the most effective. When host plants were treated with a concentration of 10％, the essential oil of E.citriodora， the repellent time of A.germari, P.hislaris, and W.alternatus was 9 d, 12 d, and 4 d, respectively with treatment of adults with a concentration of 0．625％， the repellent time was 5 d, 11 d, and 1 d, respectively. No significant Prepellency effects had been found when adults were treated with essential oil of E.exserta.