巴氏新小绥螨在马铃薯腐烂茎线虫上的实验种群生命表及其捕食作用

The experimental population life table and functional response of the predatory mite Neoseiulus barkeri(Hughes) to potato rot nematode Ditylenchus destructor(Thorne)

为明确巴氏新小绥螨Neoseiulus barkeri对马铃薯腐烂茎线虫Ditylenchus destructor的捕食能力,以马铃薯腐烂茎线虫和椭圆食粉螨Aleuroglyphus ovatus为猎物饲养巴氏新小绥螨,构建了巴氏新小绥螨的实验种群生命表,并构建了雌成螨对马铃薯腐烂茎线虫的捕食功能反应模型。结果显示,巴氏新小绥螨取食马铃薯腐烂茎线虫后能完成整个生活史,平均世代为6.71 d,产卵前期、产卵期、日产卵量以及雌成螨寿命分别为2.89 d、19.13 d、1.79粒和26.44 d,与取食椭圆食粉螨后的各参数间均无显著差异。巴氏新小绥螨雌成螨对马铃薯腐烂茎线虫的捕食功能反应为Holling Ⅱ型,在温度16~28℃范围内,其攻击系数(a)、捕食能力(a/T_h)、最大日捕食量(1/T_h)均随温度升高而升高,处理时间(T_h)缩短;在28℃时日捕食量达到最高,为52.69条,处理时间最短,为0.019 d;当温度高于32℃时捕食量开始下降。表明巴氏新小绥螨具有防治马铃薯腐烂茎线虫的潜力。

To clarify the predatory capacity of the predatory mite Neoseiulus barkeri to potato rot nematode Ditylenchus destructor, the experimental population life table ofN. barkeri was established by feed- ing the mite with D. destructor and Aleuroglyphus ovatus, respectively, and the functional response of N. barkeri to D. destructor was also constructed. The results showed that iV. barkeri could finish its life cycle by feeding them on D. destructor; the average generation period was 6.71 d, and the preoviposi- tion, oviposition, daily fecundity, female longevity were 2.89 d, 19.13 d, 1.79 and 26.44 d, respectively. No significant differences were found in these parameters ofN. barkeri between two treatments. The predatory functional response was in accordance with Holling II equation. At the range of 16-28%, the attack rate （a）, the predatory capacity （a/Th） and the maximum predatory number （1/Th） increased with rising temperatures, and the average handling time was reduced. The highest daily predation was 52.69 and the shortest treatment time was 0.019 d at 28℃. The maximum predatory number was reduced while the temperature above 32 ℃. The results indicated that N. barkeri had the potential in preventing and controlling D. destructor.