黄瓜新小绥螨对二斑叶螨的捕食效应研究

Predatory functional response of Neoseiulus cucumeris on Tetranychus urticae

本文在25±1℃、相对湿度80%±5%和光照(L∶D=16 h∶8 h)条件下研究了黄瓜新小绥螨Neoseiulus cucumeris对二斑叶螨Tetranychus urticae不同螨态的捕食功能反应、捕食选择性及个体间干扰反应,以期为黄瓜新小绥螨的大田释放和利用提供理论依据。结果表明,黄瓜新小绥螨对二斑叶螨各螨态捕食功能反应符合HollingⅡ型圆盘方程,其对二斑叶螨卵(a/Th=47.9965)的控制作用强于若螨(a/Th=27.6906)和成螨(a/Th=9.3963)。黄瓜新小绥螨对二斑叶螨卵和若螨表现为正喜好性(C_(i)>0)、成螨表现为负喜好性(C_(i)<0)。在相同猎物密度下,黄瓜新小绥螨对二斑叶螨成螨捕食率随着自身密度增大而降低,捕食者自身密度干扰反应方程为E=0.2225P^(-0.617)。

In order to clarify the predatory functional response,predatory selectivity and individual interference response of Neoseiulus cucumeris to different stages of Tetranychus urticae under the lab condition of 25±1℃,RH 80%±5%,and light(L∶D=16 h∶8 h).The result showed that the predatory response of N.cucumeris to T.urticae was in accordance with the HollingⅡdisc equation,among which,the control effect on the eggs(a/Th=47.9965)was the strongest,than that of the nymphs(a/Th=27.6906)and adults(a/Th=9.3963)followed respectively.N.cucumeris showed positive preference to T.urticae eggs and nymphs(C_(i)>0),and showed negative preference to adults(C_(i)<0).At the same prey density,the predation rate of N.cucumeris on the adults of T.urticae decreased with the increase of its own density,and the predator's own density interference response equation was E=0.2225P^(-0.617),which will further provide theoretical basis for the field release of N.cucumeris.