黄斑星天牛和光肩星天牛是宁夏严重发生的蛀干害虫。近年来研究表明,这两种天牛对树种有明显的选择性,对臭椿和针叶树有明显的拒避现象。为了进一步证实和研究其忌避作用的原因,我们对臭椿、云杉、桧柏和侧柏等树种进行了观察和内含物提取分析研究。观察和分析结果表明,从各树种中提取出的挥发性物质,对天牛的取食和产卵行为有一定影响,从而探明了臭椿等树种对天牛有拒避作用的原 The yellow-spotted celastrus and the light-shouldered Asteroid beetle are the most serious pests in Ningxia. In recent years, studies have shown that the two kinds of beetles on tree species have obvious selectivity, Ailanthus altissima and conifers have obvious rejection phenomenon. In order to further confirm and study the reason of its repelling effect, we observed and analyzed the contents of Ailanthus altissima, Spruce, Cypress and Oriental arborvitae. Observation and analysis showed that the volatile compounds extracted from each species had some influence on the feeding and oviposition behavior of Beatles, and thus proved that the species such as Ailanthus altissima