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从田间山楂叶螨尸体上分离到一株真菌８６Ａ—２菌株。经形态观察和生物学性状研究，该菌株与顶头孢霉菌（Ｃｅｐｈａｌｏｓｐｏｒｉｕｍａｃｒｅｍｏｎｉｕｍｃｏｒｄａ）近似［１］。经证病试验表明该菌株是叶螨属昆虫的病原真菌，有很强的致病力，田间试验表明对山楂叶螨、棉叶螨具有较好的生物防治效果。
A strain of fungus 86A-2 was isolated from the body of hawthorn spider mites in the field. Morphological observation and biological traits, the strain and Cephalosporium macremoniumcorda (1). The pathogen test showed that the strain is a pathogenic fungus of Tetranychus urticae and has strong pathogenicity. Field experiments showed that it has good biological control effects on spider mites and spider mites of hawthorn.