云斑天牛对补充营养寄主的选择性

通过林间调查和室内选择性试验,研究云斑天牛Batocera horsfieldi(Hope)成虫在补充营养阶段对多种寄主植物的选择性。林间调查结果表明,云斑天牛成虫对法国冬青(V.awabuki)和光皮桦(B.luninifera)有较强的嗜食性,林间最高取食选择率分别为100%和92.4%。利用"Y"型嗅觉仪测定云斑天牛成虫对法国冬青、核桃(Jugians regia L.)、光皮桦和杨树(Populus tomentosa)等寄主挥发物的行为反应,生测结果与林间调查及室内选择结果一致,法国冬青和光皮桦的挥发物对云斑天牛引诱效果明显,并且枝条挥发物引诱力高于叶片挥发物,引诱效果最佳的组合为:采用蒸馏法,用二氯甲烷提取的冬青枝叶粗提物;采用浸提法,用乙醚提取的冬青和光皮桦枝叶粗提物和二氯甲烷分别提取的冬青枝和叶的粗提物。

Preference of Batocera horsfieldifor adults to feeding plants

The preference of Batocera horsfieldi Hope adults to various feeding plants was investigated in both field and laboratory. The highest selection rate on Viburnum awabuki and Betula luminifera by B. horsfieldi adults in field was 100% and 92.4%, respectively. Y-tube olfactometer was used to test the role of volatiles from V. awabuki, B.luminifera, Jugians regia L., and Populus tomentosa in host preference of the adults. The results from Y-tube experiment were consistent with the observation in the field. The volatiles from V. awabuki and B.luminifera had strong attractive effect on adults, and the volatiles from their branches had stronger attractant effect than those from leaf. The dichloromethne crude extraction of branches and leaves of V.awabuki by distillation, and aether crude extraction of branches and leaves of both V. awabuki and B.luminifera by soaking were all effective attractrants to the adults.