PROBLEM TO BE SOLVED: To provide a plant disease-controlling agent.SOLUTION: There is provided, a novel crystal of pyrazolinone derivative represented by the formula (I) having peaks with 2θ values (°)(±0.1) of 7.3, 11.3, 23.0, 24.4 in a powder X-ray diffraction pattern using CuKα rays. A plant disease-controlling agent is obtained by using the crystal as an active ingredient and formulating the active ingredient.COPYRIGHT: (C)2014,JPO&INPIT【課題】植物病害防除剤の提供。【解決手段】CuKα線を用いる粉末X線回折パターンにおいて、2θ値(°)(±0.1)が7.3、11.3、23.0、24.4であるピークを有する式(I)で示されるピラゾリノン誘導体の新規な結晶、並びに、有効成分として当該結晶を用いて、前記有効成分を製剤して得られる植物病害防除剤。【選択図】なし
