Ginger's disease, also known as rot disease or soft rot disease, occurs widely in the ginger seeding area in our region, generally losing 20% ​​to 30% of its yield, and severely reaching more than 50%. Jiangyan mainly invades the roots of underground stems, and the fleshy stems of victims are yellow-brown water stains and lose their luster. They gradually soften and rot, and the diseased part can be discharged with sloppy rice-like juice and emit odor. The leaves were wilted and dead. The leaves were bright yellow to yellow-brown with curled edges and eventually the whole plant drooped and died. Symptoms of the disease and fungi caused by root rot similar to the diagnosis can be used with microscopy or using the clip glass method to observe the presence of light bacteria, such as see watery turbidity, can be diagnosed as the disease. In the case of continuous cropping, soil viscidity, low-lying water, no covering, partial application of nitrogen fertilizers, and injury to planted crops, ginger borer disease is serious. Prevention and control of ginger borer disease: (1) Planting disease-free fields or selecting disease-free planting; (2) Crop rotation, selecting high-drainage land plots, applying lime treatment after deep turning, and increasing phosphorus and potassium fertilizers; (3) Use Agricultural streptomycin 500ppm soaking for 48 hours or 30% copper oxychloride 800 times liquid soaking for 6 hours, ginger seed indentation after cultivating wood ash; (4) timely removal of diseased plants and application of control, with 72% agricultural streptomycin Soluble powder 3000 ~ 4000 times liquid, 0.5 to 1 kg per hole or 30% copper oxychloride 800 times the Suspension agent applied, every 10 days, a total of 2 to 3 times control. In addition, as mentioned in your letter, lime is used to disinfect soil before planting; ginger strains must be burned and burned, and should not be littered in the fields. It is also one of the methods to prevent ginger plague. There are two causes of ginger leaves. One occurs at the ginger seedling stage and is caused by the infestation of pathogenic fungi. The first is that the leaves become light green and then gradually turn white to form a “white seedling†phenomenon; this occurs mainly in low-humidity ginger fields before the end of May. The situation occurred only after those species encountered low temperature, rain, and a slow emergence. The other situation is caused by deficiency of nutrients, mainly boron and zinc deficiency. The first is the chlorosis of the leaves, which gradually turns into white bars or aging, and finally the leaves die. Generally occurring after May, this situation is very common. The loss of ginger production is great. Control measures are as follows: increase boron, zinc fertilizer, with borax 3 ~ 4 kg / acre plus zinc sulfate 5 kg / acre mixed with basic fertilizer, the effect is good. If there are sporadic diseased seedlings after the end of May, 50 kg of water plus borax and 150 g of zinc sulphate are used. The borax is first dissolved in water and sprayed 2 or 3 times at intervals of 10 days.
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