[目的]探明刺桐姬小蜂Quadrastichus erythrinae Kim对寄主植物的嗅觉行为反应。[方法]利用Y型嗅觉仪测定了刺桐姬小蜂对寄主植物11种挥发物（乙酸叶醇酯、4-溴丁醚苄酯、苯甲腈、1，2-二甲苯、α-法呢烯、3-蒈烯、奎诺二甲基丙烯酸酯、柏木烯醇、水杨酸甲酯、芳樟醇、法呢醇）的嗅觉行为反应。[结果和结论]刺桐姬小蜂雌成虫对刺桐属植物挥发物中的11种化合物均具有较强的行为反应；通过嗅觉反应率、选择反应率及选择系数的研究比较，明确了不同物质及不同浓度溶液对刺桐姬小蜂的行为影响；刺桐姬小蜂对寄主挥发物具有一定的嗅觉反应，而且随着各物质浓度的增大而趋于强烈；除苯甲腈外，其余化合物的选择反应率均在50％以上，而且随着化合物浓度的增大而增大；苯甲腈在原样和稀释10倍浓度时，刺桐姬小蜂呈负趋性，并且与其他化合物的反应差异显著。%[Objective] Quadrastichus erythrinae Kim is a new invasive pest on host plant Erythrina spp. in China .Investigation on interaction between the pest and its host plant can be helpful for developing control strategies .[Method] The olfactory behavioral responses of the adult wasps toward eleven host plant volatiles were tested under the Y-type olfactometer .[Result and conclusion] Adults of Q.erythri-nae showed strong responses to all tested volatiles .Wasps displayed different behavioral responses to dif-ferent substances in different concentrations .Different olfactory parameters , such as olfactory reactive rate, olfactory selective reactive rate , and olfactory selective coefficient were used to value the wasps ’ re-sponses .The selective reaction rates of volatiles were above 50% except for compounds of benzonitile , which became more intense with the increase of compound concentration .The adult wasps were negatively chemotactic when under the concentration of unvarnished benzonitrile and 10-fold diluted benzonitrile , which showed significant differences compared with other volatiles .
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