1, avoid the source of the virus.
In the first year of planting yam, rice must be planted, wheat, wheat seeds and other Cyperaceae crops must be planted in winter, and broadleaf plants such as rape and cabbage must never be planted, so that yam will have an excellent natural growth and development environment and be less infected by pastoral viruses. Planting sites should be selected in fields with light yellow or dark brown sandy soil layers, which have not been planted with yam for more than three years.
With a good natural environment and good planting, yam will surely grow and develop healthily. In addition, Huang Liang and disease-free Dioscorea opposita should be selected as seeds, and plant ash should be applied to the wound when cutting the seeds.
2. Innovative management
After the end of August, spray pesticides and fungicides every ten days on rainy and sunny days. You can use "mancozeb+"made in Britain and "thiophanate methyl" made in Japan for 3-4 times. Herbicide can be used to weed. After the previous crop is harvested, paraquat can be used to weed, and then "acetochlor" and "steel rope" can be sprayed every 10- 15 days after rain and fine weather. Practical experience has proved that if the soil layer is soaked too much, yam will die if it is put in water. The way to control the dead vine of Dioscorea opposita is that Dioscorea opposita likes drying and is afraid of flooding, so it should be planted in a narrow box with a width of 1 m and a depth of 20-35 cm.
If it doesn't rain for a long time, the rhizome of yam will not grow well because of lack of water. You can fill more than half ditch water in the cold soil in the middle of the night or in the morning to make the surface of the carriage wet by 80%. Don't irrigate in the hot sun at noon, or yam will die because it can't stand the change of cold and heat, leading to physiological imbalance.
The correction method of yam dead vine is sent here with everyone. I firmly believe that everyone has a certain degree of certainty. I hope this article will be helpful to everyone. Good luck.