Recently, Amblyseius californicus and Phytoseiulus persimilis had been introduced into closely area of greenhouse rose to control two spots mite, respectively. 100 individual were released per square metres. They had controlled the population of spider mites in a week, respectively. In addition, in one month later we can find the population of Amblyseius californicus (average 2 individual per leaf in 100 leaves), whereas, Phytoseiulus persimilis can not be found due to it is a specialist predator of spider mites, when all spider mites were consumed by Phytoseiulus persimilis, this predators will","serif";mso-font-kerning: 1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language: AR-SA'>sely related to this new prey, we can supply better quality predatory mites at a lower price.