摘要
研究了菜蛾盘绒茧蜂Cotesia plutellae和半闭弯尾姬蜂Diadegma semiclausum2种幼虫内寄生蜂对寄主小菜蛾Plutellaxylostella生长发育的影响及2种蜂种间竞争能力.结果表明,菜蛾盘绒茧蜂寄生后,因多分DNA病毒(Polydnavirus,PDV)和毒液的作用,能完全抑制寄主化蛹;半闭弯尾姬蜂寄生后,虽也有PDV和毒液的存在,但寄主小菜蛾仍可正常吐丝发育成预蛹.菜蛾盘绒茧蜂对寄主小菜蛾生长发育的抑制程度显著高于半闭弯尾姬蜂,寄生因子在调控寄主发育中发挥重要作用.2种蜂的种间竞争结果表明,多数情况下,菜蛾盘绒茧蜂是成功者,这说明寄生蜂所拥有的寄生因子是决定其寄生能力大小的生理基础.
Study was conducted on the effect of two endoparasitoids, Cotesia plutellae （Kurdjumov） （Hymenopera： Braconidae） and Diadegma semiclausum Hellen （Hymenoptera： Ichneumonidae） on the growth and development of the same host larvae, Plutella xylostella （Lepidoptera： Plutellidae） and the competitiveness between them. The result show that the PDV and venom of C. plutellae could prolong the period of host larvae development and inhibit host pupation. The PDV and venom of D. semiclausum also could inhibit host complete pupation, but the host still could develop into prepupal period. C. plutellae had stronger affect on host development than D. semiclausum. The competition experiments revealed that C. plutellae was a better competitor in most cases than D. semiclausum when both species parasitized the same host larvae. This shows that the parasitism factors of the endoparasitoids were the physiological bases for interspecific competitive interactions between two endoparasitoids C. plutellae and D. semiclausum.
出处
《河南农业大学学报》
CAS
CSCD
北大核心
2005年第3期308-311,316,共5页
Journal of Henan Agricultural University
基金
国家自然科学基金项目资助(30471168)
关键词
菜蛾盘绒茧蜂
半闭弯尾姬蜂
小菜蛾
调控能力
Cotesia plutellae
Diadegma semiclausum Hellen
Plutella xylostella
capacity of regulation
作者简介
李欣（1968-），男，山西榆次人，博士，从事有害生物综合治理研究。
