First, the symptoms of ginger Stem rot in the early stages of the disease, the stem base appears watery spots ranging in size, and gradually expanded, yellow leaves, lesions around the base of the disease around the week, resulting in stem base tissue gradually rot. As the transport of moisture nutrients is hindered, the main stems of the aboveground stems die from top to bottom and the leaves become black and wilted. When the humidity is high, the soil is opened and white cotton floe is visible in the diseased area and soil. Great harm. Second, the transmission of pathogenic bacteria with mycelium latent in diseased ginger and sickness on the winter, or mycelium and chlamydospore in the soil in winter, the conditions can be suitable for disease. It usually begins in May, and the germ-bearing ginger can still continue to develop after the harvest, continuing until the seedlings are planted in March of the following year. Third, the incidence of conditions of high temperature and humidity is conducive to the occurrence of ginger stem rot, the appropriate incidence temperature of 20 °C -25 °C. Ginger is a light-tolerant drought-tolerant plant, and it is easy to develop on plots with poor ventilation and light transmission. Yellow mud loam and sticky heavy soil are heavy. Should use deep soil, good drainage, loose soil, sandy loam rich in organic matter, soil pH value of 6-7 is appropriate, phosphorus, potash fertilizer can effectively promote ginger growth, improve disease resistance. The bacteria can survive in the soil for a long time, and the amount of bacteria accumulated in the replanting plots is relatively heavy. Fourth, prevention and control measures (1) selection of pest-free, no rotten ginger, to prevent spread of pests and ensure seedlings full seedlings. When sowing, use 40% of Fuxing Star EC 8000 times soaking, but also use 50% carbendazim 200 grams 100 kg of water per 100 kg of seeds, soak for 4-5 minutes, dry and wait for broadcast. (2) Soil disinfection. In the severely diseased plots, 70% of thiophanate, 50% of carbendazim, 50% of dextromethorphan, or thiram, 1-1.5 kg of fine soil, 30 kg of fertilized soil are applied to the soil per mu. The use of lime for disinfection in acid soils can prevent soil-borne diseases. (3) Reasonable rotation. With the grass crops for more than 2 years, turn crops to prevent disasters. (4) Use fertilizer scientifically to improve the soil. Ginger likes better soil permeability, available per kilogram of potassium sulfate no-tillage 100 kg and 250,000 kilograms of well-adapted soil miscellaneous fertilizer, boron 1 kilograms of the family, zinc family, 1.5 kilograms. (5) Cultivation with ridges to improve soil aeration and promote underground stem growth. The ridge is 1 meter wide and the ridge height is 20 centimeters. When the seedling height is 30 centimeters, four bamboo vines per square meter are used to build an adult frame to promote ventilation, light transmission and moisture flow, promote photosynthesis of leaves, and prevent disease. . (6) At the beginning of the disease, use multi-purpose 250 times liquid plus natural brassin--Shufeng 481 to irrigate or spray the leaves, and also use 40% of Fuxing EC 8000 times and 75% of chlorothalonil 1000 times. Irrigate the roots at the site of the disease, and irrigate 50-100 ml per plant. Irrigate once every 10 days.
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