• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>5th International Workshop on Management of the Diamondback Moth and Other Crucifer Insect Pests(第五届小菜蛾及其他十字花科蔬菜害虫治理国际研讨会) >After-release dispersal of Diadegma semiclausum and its effect on diamondback moth population and damage,and indigenous parasitoids
【24h】

After-release dispersal of Diadegma semiclausum and its effect on diamondback moth population and damage,and indigenous parasitoids

机译：Dia虫的释放后扩散及其对小菜蛾种群和危害以及本地寄生虫的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Diadegma semiclausum，an exotic parasitoid of the diamondback moth，was introduced and released in the highlands of Kenya，northern Tanzania and southwest Uganda. The natural spread of the parasitoid from one of the release sites in Kenya，27 months after the release，was assessed through collections made at equidistant points in four cardinal directions. The parasitoid was found up to a distance of 30 km from the release site.Wherever D.semiclausum was collected，it was the major parasitoid species.Diamondback moth populations were slightly lower near the release site than at distant collection points. Indigenous parasitoids collected were Oomyzus sokolowskii(Hym.：Eulophidae)，Diadegma mollipla(Hym.：Ichneumonidae)and Apanteles sp.Foerster(Hym.：Braconidae).Overall parasitism by D.semiclausum，the introduced parasitoid，was more prevalent than by indigenous parasitoids. In Tanzania and Uganda，the results of a field survey conducted 24 and 21 months after release of D.semiclausum，respectively，indicate that the overall parasitism and the contribution of the introduced parasitoid to the control of the diamondback moth population decreased with increasing distance from the release point. In Tanzania，the diamondback moth population declined from 6.1 per plant，recorded eight months after introduction of D.semiclausum，to 3.2 per plant.At the release site in Tanzania，the percentage parasitism was over 70 percent but this declined to 47 percent at more than 10 kilometres away from the release site.Within the release area in Uganda，diamondback moth population declined from 1.8 per plant recorded before release，to 0.7 twenty-one months after introduction of D.semiclausum.Percentage parasitism was over 50 percent but this declined to 31 percent at more than 20 kilometres away from the release site. In both countries，this was attributed to the lack of farmers’understanding of the biological control activities and the continuation of insecticide use.A farmer education programme is recommended to improve the situation.
机译：Diadegma semiclausum是小菜蛾的一种奇异寄生虫，已在肯尼亚，坦桑尼亚北部和乌干达西南部的高地被引入和释放。释放后27个月，肯尼亚一个释放地点的寄生虫的自然扩散通过在四个基本方向上等距点的收集进行评估。在距释放点30 km处发现了该寄生虫。无论何处采集到D.semiclausum，它都是主要的寄生虫种类。在释放点附近，菱形蛾的种群数量比远处的收集点略低。收集到的土著寄生物是Oomyzus sokolowskii（Hym.：Eulophidae），Diadegma mollipla（Hym.：Ichneumonidae）和Apanteles sp.Foerster（Hym.：Braconidae）。寄生虫。在坦桑尼亚和乌干达，D.semiclausum释放后分别进行了24和21个月的田间调查结果表明，总体寄生性和引入的寄生性寄生虫对小菜蛾种群控制的贡献随着与小菜蛾距离的增加而降低。释放点。在坦桑尼亚，小菜蛾的数量从引进小龙虾后的八个月的每株6.1下降到每株3.2。在坦桑尼亚的释放场所，寄生率超过70％，但在更多的时候下降到47％。距释放点10公里以内。在乌干达的释放区域内，菱形蛾的数量从释放前记录的每株植物1.8下降到引入D.semiclausum的二十一个月后的0.7。寄生率超过50％，但下降了在距离发布站点20多公里的地方达到31％。在这两个国家，这归因于农民对生物防治活动缺乏了解以及杀虫剂的持续使用。建议对农民进行教育计划以改善这种状况。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号