粉蚧长索跳小蜂对堆蜡粉蚧的寄主选择性和功能反应

Host Selection and Functional Response of Anagyrus dactylopii

摘要: 本文研究了粉蚧长索跳小蜂对堆蜡粉蚧的寄主选择性和功能反应。结果表明：(1)粉蚧长索跳小蜂可寄生堆蜡粉蚧二龄、三龄若虫和雌成虫,不寄生卵和一龄若虫。在无选择试验里,堆蜡粉蚧三龄若虫和雌成虫的被寄生率和每一被寄生主含卵量都显着高于二龄若虫。在有选择试验里,在堆蜡粉蚧的寄生率和寄生蜂产卵都以雌线成虫的最高,三龄若虫次之,二龄若虫最少,且三者间存在显着的差异;而堆蜡粉蚧雌成虫和三龄若虫的每一被寄生寄主的含卵量都显着高于二龄若虫。(2)粉蚧长索跳小蜂对堆蜡粉蚧三龄若虫的功能反应为HollingⅡ型反应,蜂产卵量随寄主密度增加而呈类似于Holling圆盘方程曲线变化,关系式为N=3.401Nt/(1+0.0905Nt)+1.019.

Abstract: The present paper dealt with the host selection and the functional response of the para-site,Anagyrus dactylopii,to the host,Nipeacoccus vastator.the parasite oviposited only in above second instar of the host.The number of eggs laid by the parasite was more in the third-instar and the adult females than in the second-instar.The functional response of the paradite to the third-in-star host was related to Holling Response II with the parameter of 1.278.The functional response equation was expressed as N=3.401Nt/(1 + 0.905Nt)+1.019.The biological control on the spherical mealybug was discussed in the paper.