Yam is a delicious and nutritious food. It is planted all over China, which is very fashionable and has a very large scale of operation. At present, one mu of Chinese yam is planted artificially, and the yield is about 4,000 Jin, while the market price recovered from the sales market can reach 2.5 yuan, and the yield per mu can exceed 1 10,000 yuan. Root rot of yam is fatal to the cultivation of yam. Because its economic benefits come from underground stems, the stems are rotten, so it has no economic value and is considered white, which immediately causes property losses. Therefore, farmers must have a certain grasp of yam root rot.
Symptoms: The key to the disease is the outbreak period from July to August every year. Water spots or brown atrophy will appear in the early stage of underground stem disease. With the deepening of the disease, the lesion slowly developed into dark red. Under the action of high temperature and rainy weather, underground stem diseases and insect pests developed rapidly, and the internal structure of stem block rotted. This is also the occurrence of underground stem disease. However, it is not easy to find underground stems because they are hidden in the soil. So it is necessary to inquire from a part of the ground. Some symptoms of diseased potatoes on the ground are skewed leaf color, green around petiole or atrophy of leaf margin. In the whole process of yam planting, there are often many symptoms, and root rot is a common symptom, which is particularly harmful.
This symptom usually occurs in the season with high temperature, especially in rainy days, or it is very serious. There are many underground pests, especially land resources, which are particularly serious. This will seriously affect the yield and quality of yam. This symptom is very obvious for the underground rhizome of yam, and there are often some small spots like water marks or some yellow-brown atrophy. It will gradually turn brown or dark red, and the internal structure will rot. Root rot is a soil-borne disease, and precipitation, continuous cropping, pests and diseases, and soil layer are all the causes of root rot. According to the soil layer, the key is drug prevention! In fact, before you explicitly asked these questions, you tried a lot of drugs, but you just couldn't hold back!
It is highly recommended that Tianlu Jiedu Wang, a pharmaceutical preparation, can be eaten by all fungi and bacteria, which has a good avoidance and treatment effect. However, we should pay attention to several stages: planting after seed treatment, according to experience, irrigating roots about 10 days before onset, and irrigating twice every 10 days. After that, it is almost no problem to irrigate the roots moderately according to the precipitation. However, there are other pests and diseases, such as scab, which can be controlled. Root rot is caused by one or more harmful bacteria, which can be avoided and treated from two aspects: destroying the living environment of pathogenic bacteria; Repair the growth and development of rhizome and plant type. According to the popularization of compound probiotics, the improvement of soil acidity in organic cache and the filling of various calcium elements to promote root development are all reasonable control measures at this stage. The prevention and control of root rot must nip in the bud and attach great importance to the improvement of land quality. If we only rely on biological pesticides, the control effect will be short, the index value will not treat both the symptoms and the root causes, and it will be very easy to attack in the later stage.