Control methods of common diseases and insect pests of the latest Chinese yam

Chinese yam, also known as Huaishan, is a common Chinese herbal medicine for both medicine and food in our life. It has the effect of helping digestion, sweating and diarrhea. It is also matched with Ganoderma lucidum. It is an excellent medicine for preventing and treating diabetes. With the development of its medicinal and health functions, the planting area is increasing year by year, but with the arrival of diseases and insect pests, they cause huge losses to the yield and quality of yam. So what are the pests and diseases of yam and how to prevent them? Let's take a look at the common pest control methods of yam.

1. Anthrax

Anthracnose mainly damaged leaves and stems of yam. Yellow-white spots appeared on leaves at the initial stage of disease, which gradually spread into irregular spots. The spots were brown when joined with leaves, and black spots appeared in the center. At the late stage of the disease, the spots perforated and the stems withered. It is caused by spores overwintering safely on the diseased body and spreading in the coming year. It is most serious in summer high temperature, often leading to plant wilt and death.

Control method: avoid continuous cropping, rotate with other crops for 2-3 years, remove the diseased body in time before winter, disinfect the soil before planting, apply phosphorus and potassium fertilizer during planting, enhance the disease resistance of plants, spray 1000 times solution of thiophanate-methyl when disease occurs.

2. Brown spot disease

Brown spot disease is also called dead leaf disease, which mainly damages the leaves of yam. Yellow-white spots appear in the lower part of the leaves when the disease occurs. In the later stage, the spots spread and become brown, and there are black small dots in the center. When these small dots break, they will lead to perforation of leaves, and often the leaves of plants wither and die when the disease is serious. The disease is also a spore pathogen on the diseased plant safe winter, to be the next year with the wind and rain transmission, especially in wet, rainy season, the incidence of disease is extremely high.

Control methods: rotation is also carried out, field cleaning is done well, winter pathogens are eliminated, diseased leaves are cut off in time after disease is found, then zinc is sprayed, and then chlorothalonil wettable powder is sprayed on a large scale for control.

3. Root rot

Root rot mainly damages the rhizome of yam, and the disease is not easy to find in the root system. Brown spots appear at the base of vine stem in the early stage of disease. With the passage of time, the disease spots gradually expand and become dark brown, and the center of the disease spots is depressed. When the disease is serious, brown mold filiform matter is present in the disease spots, the rhizomes atrophy and rot, and finally the plants die.

Control method: The disease is mainly transmitted through soil and fertilizer with disease. It is easy to occur in high temperature and high humidity environment. Rotation, collection and cleaning of sick and disabled materials, disinfection of seed soil once before planting, root irrigation with 600 times solution of 75% chlorothalonil wettable powder when it occurs.

4. White grubs, red spiders

White grubs mainly harm the root system of yam, often gnaw the root block of yam, make it grow slowly, and affect the quality; while red spiders mainly harm the leaves, it often gathers on the back of yam leaves, sucks the juice of leaves, causes the leaves to lose water and wither and fall, causing plant atrophy and premature aging.

Control methods: white grubs can be used trichlorfon 1000 times the liquid cast poison, and red spiders can be used to kill acaricide 1200 times the liquid spray.

The above are the common pest control methods of yam brought by farming network. The characteristics of yam are different due to factors such as region and climate, but the pest control should not be taken lightly. The prevention and control of pests and diseases is the premise of realizing high yield and excellent yield of yam.