Ginger scab mainly damages the leaves. The diseased leaves have yellowish-white oval or irregular shaped spots. The middle grey edge is brown and the size is about 2--5 mm. When the wet spot grows scattered small black spots, the diseased part is cracked or perforated when dry, and if many spots are connected, some or all of the leaves may dry up.
Prevention and control of ginger spot disease should be taken to strengthen and improve the cultivation and disease control measures, with the comprehensive prevention and treatment of spraying protection measures. Since the diseased body is the main primary infestation source, clean garden work and continuous cropping should be thoroughly implemented before sowing. Combine soil preparation with soil preparation, apply sufficient organic fertilizer, level the surface to facilitate irrigation, avoid single or excessive application of available nitrogen fertilizer, and appropriate application of phosphorus and potassium fertilizers can enhance resistance. Spray protection: At the beginning of the disease, spray 70% thiophanate-methyl wettable powder 1000 times, or 75% chlorothalonil wettable powder 800--1000 times; or 30% copper oxychloride suspension 300- -400 times liquid, or 70% thiophanate-methyl WP 1000 times plus 75% chlorothalonil wettable powder 1000 times, spray once every 7-8 days, continuous spray 3--4 times.
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