瓜实蝇龄期和密度对蝇蛹金小蜂寄生能力的影响

蝇蛹金小蜂是蝇类害虫重要的蛹期寄生性天敌,为了评价其对蔬菜上重要害虫瓜实蝇的控害潜能,本文就蝇蛹金小蜂对瓜实蝇蛹的寄生潜能进行了研究,建立了功能反应和干扰效应数学模型。结果表明,蝇蛹金小蜂对不同蛹龄瓜实蝇蛹的寄生功能反应均符合 HollingⅡ模型,但不同蛹龄之间的功能反应参数存在差异。蝇蛹金小蜂对 2 日龄、4 日龄和 6 日龄瓜实蝇蛹的模方程分别为 Na = 0.478 0N0/(1+0.010N0)、Na = 0.474 0N0/(1+0.008 6N0) 和 Na = 0.476 4N0/(1+0.009 9N0)。蝇蛹金小蜂自身密度也会对寄生产生一定的干扰效应,用 Hassell-Varley 模型拟合,蝇蛹金小蜂干扰效应方程可表示为：a = 0.071 9P –0.252 6。

The Impacts of Host Ages and Host Density on the Parasitizing of Pachycrepoideus vindemmiae Rondani on the Pupae of Bactrocera

Pachycrepoieus vindemmiae Rondani is one of the most important natural enemies of fruit fly pupae. In order to elevate the biological capacity of P. vindemmiae, the parasitic efficiencies of P. vindemmiae against different host stages (2, 4, and 6 days old) were evaluated in our laboratory. A functional response model and a disturbance hypothesis model were set up. The results showed that the pupa density significantly affected the parasitism of P. vindemmiae. At different host days, the parasitic functional response of parasitoids to hosts fitted Holling Ⅱ type without exception, but the functional response parameter at the variety of different host ages was different. The functional response of P. vindemmiae to 2, 4, and 6-day-old B. cucurbitae hosts was expressed as Na=0.478 0N0/(1+0.010N0), Na= 0.474 0N0/(1+0.008 6N0) and Na=0.476 4N0/(1+0.009 9N0), respectively. In addition, the density of parasitoids affected the parasitism to some extent and the interference fitted Hassell-Varley model, which could be well simulated as a = 0.071 9P –0.252 6.