二化螟绒茧蜂对二化螟及其寄主植物挥发物的趋性反应  

Selection responses of Cotesia chilonis, a larval parasitoid of the rice striped-stemborer Chilo suppressalis, to volatile compounds from its host and host-plants

作　　者：陈华才[1] 娄永根[1] 程家安[1] 

机构地区：[1]浙江大学应用昆虫学研究所,杭州310029

出　　处：《昆虫学报》2002年第5期617-622,共6页Acta Entomologica Sinica

基　　金：国家自然科学基金 (3 0 0 70 5 0 0 ) ;浙江省自然科学基金 (3 0 0 0 65 );高校博士点基金资助项目

摘　　要：利用Y 型嗅觉仪研究了二化螟绒茧蜂Cotesiachilonis对寄主植物 (水稻或茭白 )、二化螟Chilosuppressalis幼虫、虫粪及虫害苗挥发物的行为反应。健康植株、二化螟幼虫和虫粪的挥发物对二化螟绒茧蜂具有显著引诱作用。在虫害苗与健康苗挥发物之间 ,二化螟绒茧蜂显著地偏好虫害苗 ,但当去除虫害苗中的幼虫和虫粪后 ,寄生蜂对去虫苗与机械损伤苗的选择无显著差异 ;在虫害苗与有虫健康苗之间 ,寄生蜂显著趋向虫害苗 ,表明虫害苗本身释放的挥发物对二化螟绒茧蜂引诱作用与机械损伤苗无显著差异 ,但与二化螟幼虫或虫粪挥发物之间可能具有协同增效作用。水稻苗经机械损伤或损伤后以二化螟幼虫唾液处理 ,其挥发物对二化螟绒茧蜂的引诱作用无显著改变。二化螟绒茧蜂对不同为害程度水稻挥发物的选择无显著差异。二化螟绒茧蜂对两种寄主植物的健康苗、虫害苗、取食两种植物的幼虫及虫粪的挥发物的选择无显著差异。结果表明 ,二化螟绒茧蜂栖境定位和寄主选择过程中所利用的挥发物主要来自寄主植物、二化螟幼虫和虫粪以及虫害苗与幼虫和虫粪的协同作用。The wasp Cotesia chilonis Munakata is one of the main larval parasitoids of the rice striped stemborer, SSB, Chilo suppressalis (Walker). The behavioral responses of female Cotesia chilonis to volatile compounds emitted by these herbivores, rice or water oat plants and herbivores damaged rice plants were studied with a Y tube olfactometer. Female wasps were attracted to the volatiles from plants, striped stemborer larvae and larval frass. Volatiles from herbivore damaged plants were more attractive to the female wasps than those from healthy plants. If larvae and larval frass were removed from damaged plants, these were no longer more attractive than mechanically damaged plants. However volatiles from herbivore damaged plants were also more attractive than healthy plants with larvae. This suggests that there is a synergy between volatiles from larvae damaged plants, larvae and/or larval frass. Rice plants that were damaged mechanically or/and treated with the larval regurgitant did not release attractive volatiles. The degree of attraction to volatiles from two varieties of seedlings, damaged plants, larvae fed on the two varieties of seedlings or their frass was not significantly different. These results indicate that the source of volatile compounds used by A. chilonis to locate its host habitat and host come from seedlings, larvae and larval frass, and more specifically, a combination of volatile compounds from plants, larva and/or frass.

关 键 词：二化螟绒茧蜂 寄主植物 挥发物 趋性反应 水稻 茭白 行为反应 害虫幼虫 寄生蜂 

分 类 号：S476.3[农业科学—农业昆虫与害虫防治] S435.112.1[农业科学—植物保护]