Q: I have root tumour disease in the "Jiufeng" grape that I planted. Among them, the seven or eight years old vines and the newly planted vines that have just been planted for two years are more severe.

Answer: "root tumor disease" is also called "root cancer disease." If it is not serious, you can use a knife to scrape off the tumor, apply 200 times liquid Hao Leke +200 times solution Yi micro, 7 days once, two consecutive times. Other non-infected ones can be sprayed with 3000 times solution and 350 times finer microemulsion, and then limestone residue is used to disinfect the root soil. If it is serious, the vines will be excavated and burned immediately. Because the disease is contagious, the land cannot be planted within a few years. Only the field crops can be changed. After 6 years, the fruit trees can be planted. Prevention of grapevine root cancer: First, improve the soil. After measuring the pH value of the soil (the pH value is severe at the time of 5.4 to 6.5), the local acidity of the soil is adjusted to a slightly alkaline pH to create an environment that is not conducive to the survival of the pathogen. The second is seedling disinfection. When introducing grape seedlings, strict quarantine should be conducted to avoid the introduction of diseased seedlings. Seedlings should be disinfected before colonization. The third is to minimize the wound. In the onset of the disease, human and livestock machinery should be avoided to damage the grape plants, and pay attention to eliminate the underground pests, reduce insect damage, and prevent the invasion of bacteria from the wound. The fourth is to spray 3 to 5 Baume degrees of lime sulfur before the spring vine sprouts. To spray grape plants, stone pillars, iron wire, and ground sprays, spray more medicine on the old grapevines on the plot. The fifth is to strengthen field management. Control the amount of nitrogen fertilizer application, re-apply phosphorus and potassium fertilizers, make up for trace elements, and reasonably load, and gradually strengthen tree vigor and improve plant resilience.