Symptoms Potato tubers first produce brown dots on the surface, which expand to form brown round or irregular large plaques. Due to a large number of cork cells, the surface is roughened, and the center is slightly depressed or raised in the later period. The lesions are limited to the skin and do not penetrate into the potato, which is different from white spot disease.
Pathogen Streptomyces scabies (Thaxter) Waks.et Henvici called streptomyces scabies, an actinomycete. Filamentous filaments, branches, very fine, often spiral-shaped tip, a large number of continuous spores spores. The spores are cylindrical and have a size of 1.2-1.50.8-1.0 (μm).
Transmission routes and pathogenic conditions Germs are rotted in the soil or overwinter on diseased potatoes. Before the early epidermis of tuber growth, the pathogens infect from lenticels or wounds, and it is difficult to invade the surface of the tubers after they have been wooded. Plants that grow from diseased potatoes are prone to disease, and it is also possible that sweet potatoes are sown in infected soils. The temperature suitable for the disease is 25-30°C, and the weight of neutral or slightly alkaline sandy loam is heavy. Less than pH 5.2 is rare. There was a difference in disease resistance among varieties, white thin-skin varieties were susceptible, and brown-skinned varieties were more resistant to disease.
Control methods (1) Use disease-free seed potatoes, must not be adjusted from the ward. Before sowing, use 40% formalin 120 times soaking for 4 minutes. (2) Applying more organic fertilizer or green manure can inhibit the disease. (3) More than 5 years rotation with Cucurbitaceae, Leguminosae, Liliaceae vegetables. (4) Choose a vegetable field with good water retention. The potato should be watered in time for drought.
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