深点食螨瓢虫和塔六点蓟马对朱砂叶螨的捕食作用

本文通过室内对深点食螨瓢虫Stethorus punctillum Weise和塔六点蓟马Scolothrips takahashii Priesener成虫捕食朱砂叶螨Tetranychus cinnabarinus(Boisduval)成螨的功能反应及种内干扰作用的研究,比较了2种天敌对朱砂叶螨的捕食能力。结果表明,深点食螨瓢虫和塔六点蓟马成虫对朱砂叶螨成螨的捕食功能反应均属HollingⅡ型,其模型分别为Na=0.7181N0/(1+0.0175N0)和Na=0.5168N0/(1+0.0136N0),日最大捕食量分别为41.11头和38.14头,处置时间分别为0.0243和0.0262d。深点食螨瓢虫和塔六点蓟马种内干扰模型分别为E=0.1916P-0.1805和E=0.1535P-0.4684。深点食螨瓢虫成虫对朱砂叶螨成螨的捕食能力强于塔六点蓟马。

Study on predation of Stethorus punctillum and Scolothrips takahashii on Tetranychus cinnabarinus

The predatory abilities of Stethorus punctillum Weise and Scolothrips takahashii Priesener adults on Tetranychus cinnabarinus （Boisduval） adults were studied under laboratory conditions.The results showed that the functional responses of S.punctillum and S.takahashii to T.cinnabarinus both followed the Holling type Ⅱmodel;the respective fitted Holling disc equations were Na=0.7181N0/（1＋0.0175N0） and Na=0.5168N0/（1＋0.0136N0）.The maximum daily number of T.cinnabarinus consumed by individual S.punctillum and S.takahashii were 41.11 and 38.14,respectively and the respective prey-handling times for each species were 0.0243 and 0.0262 d.The models of intraspecific interference for S.punctillum and S.takahashii were E=0.1916P-0.1805 and E=0.1535P-0.4684,respectively.S.punctillum adults were more effective predators of T.cinnabarinus adults than S.takahashii adults.