The present invention provides a control agent for Sigatoka for controlling Sigatoka occurring in Musaceae plant, particularly banana, and a method for controlling thereof, and use thereof.In order to controlling Sigatoka occurring in Musaceae plant, particularly banana, by using a control agent comprising an isoprothiolane (diisopropyl 1, 3 - dithiolan - 2 - ylidenemalonate) as an active ingredient, it is to provide a control agent for Sigatoka for spraying or coating on the leaf blade to the pseudostem of the parent strain pseudostem of banana that is the occurrence of Sigatoka or to predict the occurrence of Sigatoka, a method for controlling thereof, and use thereof.提供用以防除發生於芭蕉科植物(尤其香蕉)之葉斑病之葉斑病防除劑及其防除方法及其使用。為了利用有效成分化合物為亞賜圃(isoprothiolane)(1,3-二硫茂環-2-亞丙二酸二異丙酯(diisopropyl 1,3-dithiolan-2-ylidenemalonate)之防除劑來防除發生於芭蕉科植物(尤其香蕉)之葉斑病,而用於對發生或預測會發生葉斑病之香蕉親偽莖株之葉身部至偽莖部,進行散布處理或塗布處理等之葉斑病防除劑、及防除方法、及其使用。