An object of the present invention is to provide a new use of a bacterium belonging to the genus Corimonas. A miticide composition containing a bacterium belonging to the genus Collimonas. [Selection] Figure 6【課題】コリモナス属細菌の新たな用途を提供すること。【解決手段】コリモナス(Collimonas)属に属する細菌を含む殺ダニ用組成物。【選択図】図6