PROBLEM TO BE SOLVED: To provide a composition and method for controlling plant diseases, pests and weeds having a low environmental load and drug resistance risk, having excellent control activity against the plant diseases, pests, weeds and nematodes, and healthily growing plants to be protected from the plant diseases, pests, and weeds.SOLUTION: A Plectosphaerella filamentous fungus having controlling ability against plant diseases, and a seed treatment agent or a soil treatment agent are applied to a plant or soil.COPYRIGHT: (C)2013,JPO&INPIT【課題】環境負荷と薬剤抵抗性リスクが低く、植物病害、害虫、雑草、センチュウに対して優れた防除活性を有し、植物病害虫雑草より保護すべき植物を健全に生育させる植物病害虫雑草防除用の組成物及び方法を提供する。【解決手段】植物病害防除能を有するプレクトスファエレラ(Plectosphaerella)属糸状菌と、種子処理剤あるいは土壌処理剤とを植物あるいは土壌に処理する。【選択図】なし