PROBLEM TO BE SOLVED: To provide insecticidal/miticidal compositions for agricultural and horticultural use that can efficiently control various pests and mites that are difficult to control with treatment using a single active ingredient.SOLUTION: An insecticidal/miticidal agent for agricultural and horticultural use contains, as active ingredients, 5-(1,3-dioxane-2-yl)-4-[4-(trifluoromethyl)benzyloxy]pyrimidine, and N-[1-((6-chloropyridine-3-yl)methyl)pyridine-2(1H)-ylidene]-2,2,2-trifluoroacetamide.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】単独の有効成分による処理では防除が困難な各種害虫・ダニ類を効率的に防除し得る農園芸用殺虫・殺ダニ剤組成物の提供。【解決手段】有効成分として5-(1,3-ジオキサン-2-イル)-4-[4-(トリフルオロメチル)ベンジルオキシ]ピリミジンと、N-〔1-((6-クロロピリジン-3-イル)メチル)ピリジン-2(1H)-イリデン〕-2,2,2-トリフルオロアセタミドとを含有する農園芸用殺虫・殺ダニ剤。【選択図】なし