Biological agent capable of preventing and controlling underground pests and used for vegetable planting, and preparation method thereof

The invention discloses a biological agent capable of preventing and controlling underground pests and used for vegetable planting, and a preparation method thereof, wherein the spore powder of multi-stroma Cordyceps militaris is inoculated on insects, and infected and killed insects are grinded into powder so as to prepare the biological agent. According to the present invention, the single strain is used, such that the competitive inhibition among multiple strains during the culture can be reduced, and the culture times of the strain and the sporophyte are greatly shortened; and the surviveability of the pore of the strain infecting the insect is enhanced in the natural environment, such that the storage requirement is lowered. 本发明公开了种蔬菜种植地下害虫防治用的生物药剂及其制备方法，是将多座虫草菌的孢子粉接种在昆虫上，然后将感染致死的昆虫打磨成粉制得。本发明使用单菌株，在培养过程中降低了多菌株之间相互竞争抑制的效应，大大缩短了菌株及孢子体的培养时间；由于感染虫体后菌株孢子在自然环境中的存活能力增强，降低了储存要求。