Pecan leaf scorch mite, Eotetranychus hicoriae(McGegor), populations were significantly reduced by predatory mites that were released onto the foliage of pecan trees in controlled field experiments in 2002, 2003 and 2004. Two species of predatory mites, Phytoseiulus persimilis and Galendromus occidentalis, were released into the center tree of one-acre plots at two rates, 500 and 1000 mites per tree. Mite abundance was monitored weekly in the release tree and in trees one and two rows away from the release tree for four weeks afer the release date. The abundance of pecan leaf scorch mite was significantly lower in the release tree one week after release, and significantly lower in the release trees and the trees two rows away from the release tree, three and four weeks after the release date. P. persimilis was more effective than G. occidentalis in reducing pecan leaf scorch mite abundance.