PROBLEM TO BE SOLVED: To provide a plant disease control agent and a control method thereof, which contribute to the harvest of disease-free agricultural products without being affected by recent temperature fluctuations and environmental changes. According to the present invention, a montmorillonite powder finely divided into nanosizes is used, which comprises 74% by weight of silicon dioxide, 15.2% by weight of aluminum oxide, 3.8% by weight of sodium oxide, and 0.1% of potassium oxide. There is provided a plant disease control agent comprising 1% by weight, 2.9% by weight of magnesium oxide, 1.7% by weight of calcium oxide, 0.15% by weight of titanium oxide and 0.29% by weight of iron oxide. According to claim 2, there is provided a plant disease control agent comprising 2% dispersant obtained by adding water to the montmorillonite powder, and a plant disease control method using the same. [Selection diagram] None【課題】昨今の気温変動や環境異変にも左右されることなく、無病の農作物の収穫に資する植物病害防除剤とその防除方法を提供することを目的とする。【解決手段】本発明によれば、ナノサイズに微細化されたモンモリロナイトの粉末であって、二酸化ケイ素７４重量％、酸化アルミニウム１５．２重量％、酸化ナトリウム３．８重量％、酸化カリウム０．１重量％、酸化マグネシウム２．９重量％、酸化カルシウム１．７重量％、酸化チタン０．１５重量％および酸化鉄０．２９重量％で構成される植物病害防除剤が提供され、本発明の請求項２によれば、前記のモンモリロナイト粉末に水を添加し、２％分散剤とした植物病害防除剤およびこれを用いた植物病害防除方法が提供される。【選択図】なし
