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Behavioural Responses of Dendrolimus superans to Dahurin Larch and Its Nine Volatiles

落叶松毛虫对兴安落叶松9种挥发性物质的行为反应*


为弄清兴安落叶松挥发性物质及其变化对落叶松毛虫寄主选择行为的影响,将兴安落叶松苗进行剪叶损伤和落叶松毛虫幼虫取食25%针叶、50%针叶处理,以健康苗为对照,研究落叶松毛虫成虫对不同状况寄主的产卵选择情况。同时,研究落叶松毛虫雌雄成虫对兴安落叶松R型α-蒎烯、S型α-蒎烯、S型β-蒎烯、叶醇、月桂烯、3-蒈烯,β-罗勒烯、水芹烯和莰烯等9种挥发物的趋性反应。结果表明:已交尾雌虫优先在健康植株上产卵,其产卵量占总产卵量的81%~89.5%; 在不同程度损伤中,优先在轻度损伤的植株上产卵; 机械伤苗上的产卵量要大于虫伤苗上的产卵量; 将落叶松毛虫成虫触角剪去后,发现92.4%的卵被产在地面和笼网上,只有7.6%的产在苗上。在健康植株与损伤植株中,幼虫偏嗜健康植株,这与成虫偏嗜选择健康植株产卵是一致的。雌成虫对于β-罗勒烯、月桂烯和3-蒈烯,雄成虫对于莰烯和0.01,0.1,0.2,05 μL·μL-1的叶醇均表现出负趋性,β-蒎烯、S型α-蒎烯在低含量时对雌雄成虫均具有诱引作用,高含量时则表现出驱避作用。R型α-蒎烯、水芹烯、莰烯和3-蒈烯对幼虫有诱引作用,月桂烯则具有驱避作用。

Effects of volatiles and their change of Larix gmeliniion the hostplant selection of a larch defoliator (Dendrolimus superans) were studied. The larch seedlings were treated by being cut, and the defoliator larva was feeding with 25% or 50% needles before bioassay experiments. The results showed that the mated female moths preferred to oviposite on healthy seedlings of Larix gmelinii, which accounted for 86.1%~89.5% of total eggs. Among different injuries, they preferred to oviposite on lightly injured plants, and the oviposition quantities were more on mechanically injured plants than on insect feeding plants. It was found that 92.4% eggs were laid on the ground and nets, and only 7.6% were deposited on plants after the female antennae were cut. The larvae tended to healthy plants rather than injured plants, which was consistent with the results of adult oviposition choice. β ocimene, myrcene and 3carene in the volatiles had repellent effects to femal adults, while camphene and phytol of 0.01, 0.1, 0.2, 0.5 μL·μL-1 showed repellent effects to the males Besides, βpinene and S αpinene were attractive to both male and female adults in low concentrations, however showed repellent effect in high concentrations. Olfactory responses indicated that larvae were attracted by Rαpinene, phellandren, camphene and 3 carene, and repelled by myrcene.


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