PROBLEM TO BE SOLVED: To provide a disease-controlling agent for rice seedlings which is excellent in effects for controlling various rice diseases such as rice blast (Magnaporthe oryzae), rice sheath blight disease (Burkholderia glumae) and rice sheath blight disease (Rizoctinia sorani), has high safety, and is little in effects to environments, and to provide a controlling method using the same.SOLUTION: The disease-controlling agent for rice seedlings containing a rice Penicillium pinophilum having a germination-inhibiting ability to the rice seedling diseases is prepared. Strain YS-31 (NITE P-774) or its mutant can be used for the Penicillium pinophilum.COPYRIGHT: (C)2012,JPO&INPIT【課題】イネいもち病菌(Magnaporthe oryzae)、イネ籾枯細菌病菌(Burkholderia glumae)、イネ紋枯病菌(Rizoctinia sorani)等の各種イネ苗病害に対する防除効果に優れるとともに、安全性が高く、環境への影響が少ないイネ苗病害の防除剤及びこれを利用した防除方法を提供すること。【解決手段】イネ苗病害に対して、発病抑制能を有するペニシリウム・ピノフィラム(Penicillium pinophilum)を含有させて防除剤を調製する。ペニシリウム・ピノフィラム(Penicillium pinophilum)には、YS-31菌株(NITE P-774)又はその変異株を用いることができる。【選択図】図1