植物挥发性物质对落叶松球果花蝇的驱避效果

为研究外源植物挥发性物质对落叶松球果花蝇（Strobilomyia spp.）对寄主定位的干扰作用，在哈尔滨市和大兴安岭加格达奇兴安落叶松（Larix gmelinii）种子园，用松节油、樟脑、丁香油进行了室内生测和林间喷施试验。在室内，球果花蝇对1％松节油的反应率为94.23％，与1％丁香油、3％松节油、20％丁香油相比差异显著；对1％樟脑的反应率为87.92％。球果花蝇对2％丁香油的反应率最低，仅为16.30％。在室内及林间，1％松节油及1％樟脑对球果花蝇都表现为驱避作用。1％松节油及其对照对球果花蝇的驱避效果最好，平均每果虫数较清水对照的3.51分别降低了2.85和2.66，使球果被害率降低了57.0％和46.2％，种子被害率分别降低了24.7％和27.7％。其次是1％脑及其对照，每果虫数较清水对照降低了1.83和1.44个，球果被害率分别降低了9.0％和30.7％，种子被害率分别下降了12.2％和26.9％。1％丁香油对花蝇在室内表现为诱引作用，在林间表现为驱避作用。在喷施3种挥发性物质及其对照后，各个处理的球果挥发性物质主要组分的总量都较清水对照增加，各处理的α-蒎烯相对含量较清水对照大幅度降低，降低幅度在13.56％-24.83％之间；各处理的β-罗勒烯都有不同程度的增加。β-蒎烯、3-蒈烯、月桂烯、水芹烯的相对含量在各处理中升降不一。

The repellency effects of plant volatiles to Strobilomyia spp. damaging larch cones

Strobilomyia spp. (Diptera:Anthomyiidae) are the most serious pests damaging larch cones and seeds in northeastern China. In order to better understand the effects of plant volatiles on larch cone flies, Strobilomyia spp.;turpentine, camphor, and syringa balsam of various concentrations were evaluated both in the laboratory and field test as respellent for larch cone flies.The field test was carried out in the seed orchard of Dahurian larch,Larix gmelinii, located in Jiagedaqi, Daxing'an Mountain in nort...