Ginger spot disease mainly damages the leaves. The diseased leaves appear yellowish-white oval or irregularly shaped lesions. 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. The disease is caused by an infestation by a fungus called Ralstonia cinnamomea that causes mycelia, conidiospores, and conidia to overwinter on the sick or fallen soil. In the second year of growing period of ginger seedlings, the spores released a large number of conidia in the case of temperature and humidity, and they were initially infested by wind and rain and insects. 24-28 °C high temperature and rainy, foggy, dew wet weather, or large shade in the field, poor permeability, are conducive to disease; continuous cropping, low topography, soil heavy weight or excessive nitrogen fertilizer is conducive to disease. 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: In the early stage of disease, spray 70% thiophanate-methyl wettable powder 1000 times, or 70% thiophanate-methyl wettable powder 1000 times, 75% chlorothalonil wettable powder 1000 times. Spray once every 7-8 days, spray 3-4 times continuously.
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