The present invention belongs to the field of biological control of agricultural pests, and specifically relates to a functional release medium for predatory mites, a preparation method thereof, and a usage method. The functional release medium for predatory mites includes entomogenous fungi, silica, diatomaceous earth, and fillers. Among them, the entomogenous fungi and diatomaceous earth can control various harmful mites and pests and have no negative
impact on predatory mites. The use of this release medium can not only improve the
control effect of predatory mites, but also have a certain
control effect on other pests such as aphids and thrips, which can broaden the control
target range of the original predatory
mite products and achieve the integrated control of various harmful mites and pests. In addition, the usage method of this release medium is simple. The functional release medium for predatory mites can not only ensure the application dosage requirements of biocontrol microorganisms, but also reduce the number of field
pesticide applications, while improving the control efficiency and effect, reducing the control cost.