What to Do About Dead Vines in Chinese Yam? Cause Analysis and Control Methods
Chinese yam, also known as Huaishan and tushu, is a medicinal food ingredient often used to make medicinal dishes, but during the growth of Chinese yam, the phenomenon of dead vines can occur, seriously affecting the growth of Chinese yam and in severe cases even causing total crop failure. So what causes dead vines in Chinese yam? How should they be controlled? Let's take a look at the detailed introduction below.
I. Causes of Dead Vines
During the cultivation of Chinese yam, if the temperature drops, combined with rainfall, or in high-temperature and high-humidity weather, the resistance of Chinese yam weakens, making it highly susceptible to pathogen invasion. At this time, if the growing environment is unsuitable or management is improper, problems of reduced yield and quality will occur. At this point, the Chinese yam is already growing weakly, and if management is improper, it is very likely to cause the phenomenon of dead vines. After the vines die, the Chinese yam lacks leaf photosynthesis, nutrients decrease, the underground tubers stop growing, and in severe cases the root system dies, causing great harm.
II. Control Methods
1. Eliminate Viruses
When selecting a planting plot, choose a plot where Chinese yam has not been planted for more than three years. The previous crop can be rice, wheat, barley and other gramineous plants, but vegetables such as rapeseed and cabbage are not suitable. Such fields have fewer viruses, allowing Chinese yam to grow in a good environment. If conditions permit, the plot can be exposed to the sun and disinfected in combination with land preparation to reduce pests and diseases. When planting, select bright yellow, disease-free Chinese yam as seed, and after cutting, apply plant ash to sterilize the cut surface. Only under these conditions can Chinese yam grow healthily and avoid dead vines.
2. Scientific Management
Chinese yam prefers a dry environment and fears waterlogging, so when cultivating it, adopt the cultivation method of narrow beds and deep furrows. After the previous crop is harvested, weed in time. To avoid weed damage, spray herbicide once every half month on sunny days after rain to prevent weeds from growing. After the end of August, spray fungicide every half month on sunny days after rain to prevent dead vines. Mancozeb and thiophanate-methyl can be used for 3-4 sprays. During drought, furrow irrigation can be adopted, keeping the bed surface 80% moist. Note that irrigation should not be carried out under the midday sun, so as to prevent Chinese yam from being unable to tolerate the change from cold to heat, causing physiological disorders that lead to leaf drop and vine withering.
The above is an introduction to the causes of dead vines in Chinese yam and control methods. We hope it can help you. To learn more related knowledge, please follow us.