The latest control measures of yam root rot

Chinese yam is a vegetable with edible and medicinal health value, which is deeply loved by consumers. Many people eat it in detail, its market demand is great, and there are many people who grow it. However, in the process of yam planting, root rot is a disease that seriously affects the yield and quality of Chinese yam, which has a great impact on growers, so how to prevent and control it? Let's get to know it.

1. Symptoms of root rot

The root rot of Chinese yam is mainly harmful to the underground stem of Chinese yam. When the underground stem is damaged, it first appears water-stained spots or yellowish-brown necrotic class, and gradually develops into dark brown spots. In the high temperature and rainy season, sometimes the disease will produce white or pink mildew, that is, pathogenic conidia, after the plant is infected, the leaf color is not correct, the leaf color is chlorotic or the leaf edge is necrotic, preferably leading to plant death. After being infected with germs, Chinese yam is also very perishable during storage, which often brings huge losses to growers.

II. Causes of occurrence

There are many causes of root rot of Chinese yam, such as too much planting density, too small row spacing, luxuriant stems and leaves from July to August, poor permeability, and easy to occur disease when the humidity is high. Or continuous cropping, the accumulation of soil bacteria is more, or the occurrence of root nematodes is more serious, it will also induce root rot. When applying unrotten farm manure or organic fertilizer, the bacteria in the fertilizer will also occur root rot when they enter the field, or choose heavy clayey soil when planting, which is poor in air permeability and water permeability, and is easy to be infected with diseases. The precipitation is relatively heavy from July to August, and it is easy to suffer from disease when planting in low-lying land which is prone to stagnant water or poor drainage.

III. Prevention and control measures

Pay attention to crop rotation, and corn, wheat, radish, watermelon and other crops should be rotated once in three years, sowing in high terrain, low humidity, fertile and loose soil, and turning the diseased body into the soil during soil preparation in autumn. kill the pathogen after freezing in winter and sun in spring. The harvest is to burn the diseased bodies, weeds and rotten stems, or take them out of the field and bury them deeply, reduce the number of pathogens in the field, pay attention to drainage in the rainy season, reduce the field humidity, increase the application of rotten organic fertilizer, increase the looseness and permeability of the soil, and reduce the occurrence of diseases. At the initial stage of the disease, 30% carbendazim water agent (Ruimiaoqing), 50% carbendazim 1000 times solution, 58% metalaxyl manganese zinc solution and other medicament root irrigation treatment.

The above is the introduction of Chinese yam root rot prevention and control measures, hope to help you, want to know more related knowledge, please pay attention to us.