自然界里有很多昆虫因病而死亡。在苏联发现的罹病昆虫已将近200种,其病原包括病毒、细菌、真菌及原生动物,其中以真菌病最多(占60 %以上);而在真菌病中,由白殭菌[Beauveria bassiana (Bals.) Vuill.]引起的占21%。因此,白殭菌可视为昆虫的重要病原菌之一。白殭菌不但分布极广,而寄主范围亦很广。报导过白殭菌的国家不下二十余国,分布 Many insects in nature die from illness. There are nearly 200 species of diseased insects found in the Soviet Union. Their pathogens include viruses, bacteria, fungi and protozoa, of which fungal diseases account for the largest (over 60%), while in fungal diseases, Beauveria bassiana [Bals .) Vuill.] Caused by 21%. Therefore, Beauveria bassiana can be considered as one of the important pathogens of insects. Beauveria bassiana not only widely distributed, but also a wide range of host. Beauveria reported no fewer than two countries in the country, the distribution