NOVELTY - Preventing and treating ginger blast disease comprises administering multi-microorganism fertilizer, inhibiting soil fungal and nematode and plant root pests, avoiding continuous cropping, implementing more than 3 years crop rotation, planting ginger, selecting high terrain, good drainage and sandy soil block, noting ditch clearance underground drainage, preventing poor drainage, field water during rainy season, ensuring disease-free fungus fertilizer and mature organic fertilizer, and adding chaff, silicon fertilizer and fertilize potassium fertilizer.    USE - Method for preventing and treating ginger blast disease (claimed).    ADVANTAGE - The method has good economic benefit, reduces ginger blast disease average incidence, and increases yield and grade.    DETAILED DESCRIPTION - Preventing and treating ginger blast disease comprises:    (A) ecologically treating, administering multi-microorganism fertilizer, inhibiting soil fungal and nematode and plant root pests, avoiding continuous cropping, implementing more than 3 years crop rotation, planting ginger, selecting high terrain, good drainage and sandy soil block, noting ditch clearance underground drainage, preventing poor drainage, field water during rainy season, ensuring disease-free fungus fertilizer and mature organic fertilizer, and adding chaff, silicon fertilizer as base fertile and fertilize potassium fertilizer as additional fertilizer;    (B) pouring clean water, irrigating well water, preventing pollution, eradicating plant with disease, removing and digging soil fungus, spreading 1 kg slaked lime or 0.125 kg chlorinated lime, watering, decomposing organic fertilizer using HM-decomposing inoculant, uniformly mixing, and soaking ginger using 72% agricultural streptomycin for 500 times for 48 hours; and    (C) root pouring on onset initial stage with 40% agricultural streptomycin wettable powder for 2000 times every 7-10 days for 2-3 times, selecting disease-free ginger, strong growth, multi-branch and healthy and strong plant, separately harvesting, storing, germinating to yellow, smooth and disease-free ginger, irrigating on onset initial stage with Bordeaux mixture every 10-15 days for 3-5 times, and foliar spraying.