To provide a mycelium growth inhibitor that can inhibit the growth of mold mycelium attached to citrus fruits during storage or transportation and that can prevent co-rot caused by the adjoining of a rotten fruit due to mold growth and a healthy fruit.SOLUTION: Provided is: a mycelium growth inhibitor comprising an aqueous solution containing a capillary artemisia extract having (1-phenyl-2,4-hexadyl-1-one) capillin as an active ingredient, a surfactant with 8 to 20 HLB and a fatty acid glyceride； and furthermore, a mycelium growth inhibitor that can contain a polyphenol such as tannin or the like that exhibits pectin-decomposition enzyme inhibitory action.SELECTED DRAWING: None【課題】貯蔵または輸送時に柑橘類果実に付着したカビの菌糸の成長を抑制することができ、かつ、カビの増殖により腐敗した果実と健全果が隣接することで起こる共腐れを防止できる菌糸成長抑制剤の提供。【解決手段】（１－フェニル－２，４－ヘキサジイレ－１－オン）カピリンを有効成分とするカワラヨモギエキスと、ＨＬＢが８～２０の界面活性剤及び脂肪酸グリセリドを含有した水性溶液からなる菌糸成長抑制剤。更に、ペクチン分解酵素阻害作用を示すタンニン等のポリフェノールを含有させることができる菌糸成長抑制剤。【選択図】なし
