Based on modeling of the resultant time - dose - mortality data , the estimates of lc50 for the culture against the aphid species were 3 . 0 , 1 . 7 , and 1 . 2 cominia / mm2 on days 5 - 7 after exposure to conidial shower ; the estimates of lt50 dropped from 4 . 6 days at the concentration of 4 . 5 conidia / mm2 to 3 . 2 days at 26 . 3 conidia / mm2 . all aphid cadavers exhibited typical pandora syndrome . thus , the millet culture of p . delphacis was highly virulent to m . persicae , suggesting an applicability of the easy and convenient millet culture method to entomophthoralean fungi 用第1 、 5及9代黍米培养物对桃蚜2一3龄若蚜分别进行30min的单剂量抱子浴接种试验,均表现很强的侵染力,各代培养物的实际接种剂量分别为25 . 2个抱子/ mmz 、 18 . 7个抱子/ mmz和21 . 0个抱子/ mmz ,对桃蚜的lt50分别为3