Interspecific predation in Amblyseius womersleyi, Metaseiulus occidentalis, A. fallacis, Typhlodromus pyri and A. andersoni was examined. With the eggs of M. occidentalis, A. fallacis, T. pyri and A. andersoni as prey, the prey consumption and number of eggs laid of adult female A. womersleyi were fewer with M. occidentalis or A. fallacis than T. pyri or A. andersoni. The survival time of A. womersleyi was reduced when held with eggs of M. occidentalis or A. fallacis in contrast with t. pyri or A. andersoni. The prey consumption of A. womersleyi was less for the larvae of A. andersoni than those of the other species. the number of eggs laid and survival time of A womersleyi were less when held with the larvae of M. occidentalis or A. fallacis than those of T. pyri or a. andersoni. When the adult females of M. occidentalis, A. fallacis, T. pyri and a. andersoni were held with eggs of A. womersleyi as prey, the prey consumptions of M. occidentalis and A. fallacis were fewer than those of T. pyri and A. andersoni. The number of eggs laid of M. occidentalis was fewer than that of the other species. The survival times of T. pyri and A. andersoni were longer than those of M. occidentlis and A. fallacis. The prey consumptions of M. occidentalis. A. fallacis, T. pyri and A. andersoni on larvae of A. womersleyi was not significantly different. The number of eggs laid of M. occidentalis was fewer than that of the other species. The survival time of A. fallacis was shorter than that of the other species. The results suggest that the combination of A. womersleyi and A. fallacis or M. occidentalis could be more reasonable than the combination of A. somersleyi and T. pyri or A. andersoni in case of the use of two phytoseiid mites for the biological control of Tetranychus kanzawai.
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