PURPOSE: To prepare safe, strong nutritive feed for larva of coleoptera insect with low cost and without any endocyst of pathogenic fungi, by inoculating an organic decomposition accelerator using microorganism to waste medium for mushroom culture using broadleaf tree.

CONSTITUTION: A waste medium using broadleaf tree where Cortinellus SHIITAKE, Pholiota NAMEKO, etc., are cultured is managed to prevent wind and rain, penetration of field insects or various germs. Next, a microorganism- using organic decomposition accelerator such as 'Kiregen(R)' or 'Bioace(R)' is inoculated to said medium and the medium is fermented in the same way of a compost making and ripen until a larva of coleoptera insect eats the medium as a favorite feed.