Control methods of common diseases and insect pests of Chinese yam

Chinese yam, also known as Huaishan, is a common Chinese herbal medicine for both food and medicine in our daily life. it can help digestion, sweat, and stop diarrhea. it is also matched with Ganoderma lucidum. It is an excellent medicine for the prevention and treatment of diabetes. With the development of its medicinal and health care functions, the planting area is increasing year by year, but there are diseases and insect pests, which cause huge losses to the yield and quality of yam. So what are the diseases and insect pests of Chinese yam and how to control them? Let's take a look at the common pest control methods of yam.

1. Anthrax

Anthracnose mainly harmed the leaves and stems of Chinese yam. At the initial stage of the disease, the leaves appeared yellow-white small disease spots, which gradually spread into irregular disease spots. The disease spots joined with the leaves in brown, and black spots appeared in the center. In the later stage of the disease, the disease spot was perforated and the stem withered. It is caused by spores safely overwintering on diseased remains and infecting in the coming year. The disease is most serious at high temperatures in summer, often leading to plant wilting and serious death.

Control methods: avoid continuous cropping, rotate with other crops for 2-3 years, remove the disease and residue in time before overwintering, disinfect the soil before planting, increase the application of phosphorus and potassium fertilizer during planting, enhance the disease resistance of the plant, and spray with 1000 times of methyl topiramate when the disease occurs.

2. Brown spot

Brown spot, also known as leaf blight, mainly harms the leaves of Chinese yam. Yellow-white spots appear in the lower half of the leaves at the onset of the disease, and in the later stage, the spots spread and turn brown, and there are black particles in the center. When these particles break, it will lead to leaf perforation and often wither and die when the disease is serious. The disease is also a spore pathogen that survives the winter safely on diseased plants and spreads with wind and rain in the coming year, especially in wet, rainy seasons.

Control methods: also carry out crop rotation, do a good job of cleaning up the field, eliminate the pathogens of overwintering, cut off the diseased leaves in time after finding the disease, then spray Dysen zinc, and then spray large-scale control with chlorothalonil wettable powder.

3. Root rot

Root rot mainly harms the rhizome of Chinese yam, the disease is not easy to find in the root system, the plant appears small brown spots at the base of the rattan stem at the beginning of the disease, with the passage of time, the disease spot gradually expands and becomes dark brown, and the center of the disease spot is sunken. When the disease is serious, there are brown mildew filaments in the disease spot, and the rhizome atrophies and decays, which eventually leads to plant death.

Prevention and control methods: the disease is spread mainly through soil and diseased fertilizers, and it is easy to occur in a high-temperature and high-humidity environment, rotation, collecting and cleaning up the disease residues, and disinfecting the seed soil once before planting. When the disease occurs, the root is irrigated with 75% chlorothalonil wettable powder 600 times.

4. Grub, red spider

Grubs mainly harm the root system of Chinese yam, often gnawing on the root block of Chinese yam, making it grow slowly and affecting quality, while red spiders mainly harm leaves, which often cluster on the back of yam leaves and absorb the sap of leaves, resulting in loss of water and yellow and fall of leaves, resulting in plant atrophy and premature senescence.

Control methods: grubs can be poisoned by pouring 1000 times of trichlorfon, while red spiders can be sprayed with 1200 times of mites.

The above are the common pest control methods of yam brought by pro-agricultural network. Yam is affected by region, climate and other factors, and its characteristics are different, but pest control should not be taken lightly. Doing a good job in pest control is the premise to achieve high yield and high yield of yam.