Abstract:

In order to study control effects of natural enemies in Korla Pear orchard on the Tetranychus viennensis Zacher. by systematically investigation and indoor observation, and the predation functional response and interference response were analyzed. The results showed that the population density of the T. viennensis and the predation rate of the key natural enemies fit a second-degree parabola, and the daily predation rate reached the peak when there were 140 spider mites per leaf, in which the Scolothrips takahashii Prisener showed the dominant role. Key natural enemies showed a II type functional response to the population density of the T. viennensis during the increasing phase of the population. The inner interference between the key natural enemies was increased during the predation. S. takahashii played an important regulatory role in the harm of the T. viennensis.