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. 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. High temperatures of 24°C--28°C and rainy, foggy, dew-wetting weather, or large shaded fields, poor permeability, all contribute to the onset; continuous cropping, low topography, heavy earth weight, or excessive nitrogenous fertilizer are all conducive to disease. Prevention and control of ginger spot disease should be taken to strengthen and improve the cultivation and disease control measures, combined with comprehensive protection measures for spraying protection: 1. Because the diseased body is the main primary infestation source, it should be done well before the broadcast. And avoid continuous work. Rotation with rice for a year is better. 2. Combine soil preparation with sorghum, apply high-quality organic fertilizer, and level the surface to facilitate irrigation. Avoid single or excessive application of available nitrogen fertilizer. Appropriate application of phosphorus and potassium fertilizers can enhance resistance. 3, spray protection: the beginning of the attack can be sprayed (1) 70% thiophanate-methyl WP 1000 times; (2) 75% chlorothalonil WP 800 D D1000 times; (3) 30% oxygen Copper chloride suspension 300 - 400 times the liquid, sprayed every 7 - 8 days, continuous spray 3 - 4 times.
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