PROBLEM TO BE SOLVED: To provide a pest control agent using a natural enemy microorganism which is low-toxic and can quickly and effectively control insect pests and phytopathogenic bacteria over a long period.SOLUTION: The pest control agent comprises the combination of at least one natural enemy microorganism selected from a natural enemy filamentous fungus, a natural enemy bacterium, and a natural enemy virus and a reduced starch saccharified product.COPYRIGHT: (C)2009,JPO&INPIT【課題】低毒性であり、速効的で且つ長期間にわたり効果的に害虫および植物病原菌を防除することができる天敵微生物を用いてなる有害生物防除剤を提供すること。【解決手段】天敵糸状菌、天敵細菌および天敵ウイルスから選ばれる少なくとも1種の天敵微生物と還元澱粉糖化物とを組み合わせてなる有害生物防除剤。【選択図】なし