Abstract:In an attempt to evaluate the impact of initial inocula and host density on the development of the epizootic of the green peach aphid, Myzus persicae (Sulzer), caused by the entomophthoraceous fungus, Zoophthora anhuiensis (Li) Humber, 6-aptera colonies were initiated with each including different number of inoculated and uninoculated apterous adults (ratios: 0∶6, 1∶5, 2∶4, 3∶3, 4∶2, 5∶1, and 6∶0) and then were allowed freely for reproduction,fungal infection and mycosis dissemination at the optimal regi...