| 摘要 |
PROBLEM TO BE SOLVED: To easily and exactly prevent and treat Helicobasidium mompa soil disease that infests all over the farmland in Japan, cannot be soundly exterminated despite a lot of time and labor when once the crop field is attacked with the disease, and the crop plants are gradually weakened until standing decayed with extreme aggravation of the productive efficiency. SOLUTION: Powdered stevia or stevia extract liquid is applied to the soil infected with Helicobasidium mompa disease or the stevia extract liquid is diluted with water and the plants are sprayed with the diluted liquid on their leaf surfaces and stems once or twice. In the case of fruit trees already infected with the mompa disease, the soil under the infected tree is dug out and the decayed roots are removed, and the main stem infested with the disease and the treated main stem are coated with an adhesive to which the stevia extract liquid is formulated and the dug-out part is refilled with the soil to which sufficient amounts of organic compost and the powdery stevia or extract liquid are formulated. Later, the plant is sprinkled with the stevia extract liquid diluted with water on the leaf surfaces and the stem.
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