It is intended to provide a microbial pesticide which exhibits an excellent controlling effect on a number of diseases occurring in the stage of raising rice seedlings, has a high safety and little affects the environment. Namely, an agent for controlling diseases occurring in the stage of raising rice seedlings which contains a fungus belonging to the genus Talaromyces and having antagonism to pathogenic microorganisms inducing diseases occurring in the stage of raising rice seedlings.本發明係以提供對於水稻育苗時期所產生許多病害之防除效果優異、安全而對環境影響少之微生物農藥為課題。；由本發明提供水稻育苗時期所產生病害之防除劑，其為含有對於水稻育苗時期引起病害之病原菌具有擷抗作用之屬於藍狀菌屬(Ta1aromyces)之絲狀菌。
