Abstract: To provide the basis for risk assessment of Amblyseius swirskii and joint release of muhiple mite species and the effects of sex recognition on the IGP and cannibalism of predatory mites, this study- explored the intraspecific and interspecific relationships of female and male adults of three phytoseiid species： exotic generalist Amblyseius swirskii, native N. barkeri and cmnmercialized N. cucumeris. The main resuhs were as follows. The adult individuals of the three phytoseiid species did not prey on intraspecific female and male adults, and neither did the female adults of the three phytoseiid species prey on the heterogeneous female adults. But female adults of the three kinds of mites only preyed on male heterogeneous adult mites （Fisheffs Exact test, A. swirskii vs. N. barkeri： χ^2=52.342, df=1,P〈0.001; N. barkeri vs. N. cucumris： χ^2=46.452, df=1, P〈0.001; A. swirskii vs. N. cucumeris： χ^2=63.324, df=l, P〈0.001）. Thus, the female adults of A. swirskii did not cause a threat to interspecific adult mites or interspecific female adult mites. Therefore, it is not necessary to consider the negative consequences caused by negative intraspecific effects, but it should be considered to use many more female adult mites when the three phytoseiid species are released together.

Key words: A mblyseius swirskii;Neoseiulus barkeri;Neoseiulus cucumeris;Intraspecific predation;Interspecific predation;Biological control