First, the harm symptoms. After the leaves are damaged, they mostly appear at the tips of leaves or leaves, and are initially spotted as water-stained browns. They then spread downwards, expanding inwards into ovals or spindles to irregular brown spots. The spots are obvious or not obvious. Moire. Several lesions were combined to synthesize plaques and the leaves became brown and dry. A small black spot appeared on the surface of the wet spot, ie, the conidia disc of the pathogen. Second, control methods 1. Agricultural control: the rotation, to avoid continuous cropping of ginger; clean the field, collecting diseased debris collected burned at the time of harvest; implement robust cultivation, strengthen water and fertilizer management, increase phosphorus potassium fertilizer and organic fertilizer, to avoid partial application of facilities Nitrogen fertilizer; The selection of high-lying sandy loam is planted, with high sorghum deep ditch, and clear gully drainage, which is conducive to plant growth. 2. Chemical control: regularly spray plant growth and other growth promoters, so that plants do not grow strong, stable and stable; in the early onset of spraying control, available 70% thiophanate-methyl WP 1000 times plus 75 % chlorothalonil wettable powder 1000 times, or 40% polysulfide suspension 500 times, or 50% benomyl WP 1000 times, or 50% thiophanate WP 1000 times, or 30% copper oxychloride suspension 800 times spray, spray once every 10 to 15 days, continuous spray 2 to 3 times.
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