Potato tubers first produce brown dots on the surface of the tuber, expanding to form brown round or irregular large plaques; later, the central depression or bulge forms scab-like hard plaque; lesions are limited to the skin, not deep inside the potato, but Seriously reduce commodity traits. The disease is caused by a fungus. Germs are rotted in the soil or overwinter on diseased potatoes, invading from lenticels or wounds. The temperature suitable for onset is 25-30°C, and the onset of neutral or slightly alkaline sandy loam is heavy. Therefore, as long as the selection of disease-resistant varieties such as Lu Yin No. 1, in the slightly acidic soil, and the application of potassium sulfate fertilizer, can effectively prevent the occurrence of scab.
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