PROBLEM TO BE SOLVED: To provide a novel herbicide and plant growth inhibitor which exhibits a herbicidal effect and a plant growth inhibitory effect which can control weeds selectively.SOLUTION: There is provided a herbicide or a plant growth inhibitor comprising a herbicidal synergist or a growth inhibitory synergist comprising: at least one itea raw material selected from the group consisting of a crushed material, a pulverized material, a ground material, a paste and a squeezed liquid of itea leaves, and itea sap and digested powder of calcined shell containing 90 mass% or more of calcium hydroxide.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】雑草を選択的に防除できる除草効果・植物成長抑制効果を奏する新規な除草剤・植物成長抑制剤を提供すること。【解決手段】ズイナ葉の破砕物、粉砕物、摺砕物、ペースト及び搾汁、並びにズイナ樹液からなる群から選択される少なくとも一種のズイナ原料、及び水酸化カルシウムを90質量%以上含む焼成貝殻の消化粉末からなる除草相乗剤又は成長抑制相乗剤を含有する除草剤又は植物成長抑制剤。【選択図】図7
