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Potato scab
Potato scab is a bacterial disease. The pathogen is Streptomyces and it can survive permanently in suitable soils. After the bacteria invaded the plant, symptoms were not seen on the ground, but there was a scab on the surface of the potato block. Soils with dry, well-ventilated, neutral or alkaline soils are susceptible to disease, and pathogens can survive in the soil for a long time after onset. To prevent and treat the disease, we must first use a complete, disease-free potato tuber for planting. For long-term land masses, even if the disease is mild, it should be stopped for several years. Potato mealy mildew resembles scab disease. The onset of whitefly disease is the brown bulge on the tubers. After the epidermis ruptures, the sporulation does not grow spores. This is the difference between the two. Control can use 72% of streptomycin soluble powder 5000 times, neomycin (100 million units) 5000 times, 45% of Daisen ammonium water agent 900 times, DT wettable powder 500 times, DTM wettability 1000 times liquid powder, 50% Garnett WP 600 times, 52% Fengan WP 600 times, 77% WP 600 times, spray every 7 to 10 days Once, spray 2 or 3 times.