营养条件和寄主密度对椰甲截脉姬小蜂子代的影响

摘要

Asecodes hispinarum Boudek is an important larval endoparasitoid of Brontispa longissima(Gestro)pest, which mainly parasitizes the fourth instar larvae. In order to better understand the theoretical basis of the indoor breeding parasitic wasps, we studied the effects of nutrition condition and changes in host density on the offspring of A.hispinarum. The results showed that: (1)when 10% honey was added, the parasite of A.hispinarum was different with the host density change. When the host number was 5, the largest number of 2.33 for the parasite of Brontispa bngissima(Gestro))was observed. When the host density was greater than 5, the number of Brontispa longissima (Gestro)was increased with host density decreased, when 10% honey was not added, the parasite of parasitoids was not significantly different; (2)when 10% honey was added, host density did not significantly affect on the number of wasp per host, emergence rate and offspring sex ratio; (3)when 10% honey was not added, host density was significantly affected on the number of wasp per host and offspring sex ratio of A.hispinarum, but had no effect on emergence rate, the max number of wasp per host was 45.67, and offspring sex ratio was up to 96.66%.%椰甲截脉姬小蜂(Asecodes hispinarum Bou(c)ek)是椰心叶甲[Brontispa longissima (Gestro)]害虫的重要内寄生蜂,主要寄生害虫的4龄幼虫.为了更好地为室内繁殖寄生蜂提供理论依据,开展了营养条件和寄主密度的改变对椰甲截脉姬小蜂子代的影响.结果表明:(1)补充10％蜂蜜水作为营养的情况下,椰甲截脉姬小蜂寄生能力随寄主密度不同存在差异.每对寄生蜂在寄主数量为5时,被寄生的椰心叶甲数量最多,为2.33头.当寄主密度大于5时,椰心叶甲被寄生的数量有随寄主密度增加而降低的趋势;不补充营养时,寄生蜂的寄生能力差异不显著.(2)补充10％蜂蜜水时,寄主密度对每寄主出蜂量、椰甲截脉姬小蜂羽化率和后代性比并无显著影响.(3)不补充营养时,寄主密度对每寄主出蜂量和椰甲截脉姬小蜂后代性比均有显著影响,对椰甲截脉姬小蜂羽化率无影响,每寄主出蜂数量最多为45.67头,后代性比最高为96.66％.