The purpose of the invention is to provide a technique that can be applied simultaneously to all cultivated specimens when a plant of the genus Eustoma (lisianthus) is cultivated in an environment where burned tip disease occurs, the technique making it possible to significantly inhibit burned tip disease at less cost than conventional techniques without using chemicals etc. Provided is a method for suppressing burned tip disease in a plant of the genus Eustoma, the method being characterized in that when a plant of the genus Eustoma is cultivated in conditions where the air temperature exceeds 20 DEG C, a rhizosphere low-temperature treatment is performed for maintaining the rhizosphere temperature in the flower bud initiation period at substantially 10 to 20 DEG C. Also provided is a method for efficiently cultivating a high-quality plant of the genus Eustoma (lisianthus) using the method for suppressing burned tip disease.本發明之目的係提供一種於會發生葉尖焦枯症的環境下栽培洋桔梗屬植物(土耳其桔梗)時,能夠同時施用於所栽培的全個體之技術,並且不使用藥物等亦能夠以較先前技術更低的成本顯著地抑制葉尖焦枯症之技術。本發明提供一種洋桔梗屬植物之葉尖焦枯症抑制方法,其特徵在於,在以氣溫超過20℃之條件栽培洋桔梗屬植物時,實施使花芽分化期時的根圈溫度實質上維持在10℃~20℃之根圈低溫處理。另外,提供一種高效地栽培高品質洋桔梗屬植物(土耳其桔梗)之方法,係使用上述葉尖焦枯症抑制方法。
