荔枝受荔枝蝽危害后对平腹小蜂趋性的影响

采用Y-型嗅觉仪测定了荔枝蝽Tessaratoma papillosa成虫危害后，糯米糍、桂味和三月红3个荔枝品种对平腹小蜂Anastatus japonicus行为的影响。结果发现：只有当超过3头荔枝蝽成虫危害时，糯米糍植株才对平腹小蜂具有较强的引诱效果；三月红健康植株本身对平腹小蜂的引诱效果就较强，对其进行机械损伤或者害虫取食后这种作用有一定程度的增强；而桂味健康植株与机械损伤植株、虫害植株对平腹小蜂行为的影响大致相同。随着荔枝蝽危害时间的延长，以上3个品种都在被害后第2天对平腹小蜂的引诱作用达到最强，此后这种效果逐渐降低。3个品种中三月红植株在虫害后做出反应的速度最快。平腹小蜂对桂味植株的趋性一直处于相对较低的水平。

Behavioral responses of Anastatus japonicus (Hymenoptera:Eupelmidae) to litchi plants damaged by the litchi stink bug, Tessaratoma papillosa

The behavioral responses of Anastatus japonicus to Nuo Mi-Ci,Gui Wei and San Yue-Hong,the litchi varieties damaged by the litchi stink bug,Tessaratoma papillosa adults,were tested by Y-tube olfactometer.The results indicated that only if a Nuo Mi-Ci plant was harmed by more than 3 adults of T.papillosa,the attraction to A.japonicus was notable.While the attraction produced by healthy San Yue-Hong plants was per se distinct,the effect,however,could be boosted up to a higher extent after the plant was mechanically damaged by pests.The responses of A.japonicus to healthy Gui Wei plants,mechanical damaged ones and pests damaged ones were similar.The above-mentioned three varieties showed the highest attraction to A.japonicus in the second day after they were damaged by T.papillosa adults,and then the effects declined gradually.The defensive reaction of pests damaged San Yue-Hong was much faster than the others,while the taxis of A.japonicus to Gui Wei was always at a relatively low level.