Sweet potato bitter silk disease is a common disease of sweet potato. How to prevent it?

It is the characteristic of tillering, and the ear is related to tillering. The sign of strong maize plants: less tillering. Tillering usually occurs at the big bell mouth stage. Sweet potato bitter silk disease can be controlled by chlorothalonil, thiophanate and other drugs. The control effect of chlorothalonil or thiophanate-methyl and borax fertilizer on sweet potato bitter silk disease should be better. Sweet potato bitter silk disease is mainly caused by many factors such as element deficiency. Control method: Ten-element borax fertilizer can be applied once every 20-25 days from one week after planting. After the occurrence of bacterial black rot, it can be controlled by 1000 times fungicide or agricultural streptomycin spray. Prevention and control methods. Garden cleaning: eliminate rotten potatoes and vines with poor poison bait control in time: in early winter and early spring, soak fresh potato tendons or small fresh potatoes in 500 times of 90% trichlorfon solution for 24 hours to make poison bait, and put it into sweet potato fields for disinfection.

Chemical control: in summer and autumn, the edge fertilizer is combined with broken ridge application, and 50-60 kg of 20% triazophos 1000 times or 50% boiling element 75- 120 ml of water is sprayed per mu; You can also use sexual temptation. If sweet potato lacks boron, it will directly affect the tissue growth of branches and roots. The initial symptom is often that the tender leaves thicken and become brittle near the top of the main stem. In severe cases, the growth point is necrotic, but boron deficiency is rare in the field. The surface of sweet potato roots treated with severe boron deficiency will appear leathery, the surface is not smooth, shiny and red. If the roots are cut horizontally or vertically, it can be clearly seen that there are black blocky spots inside the boron deficiency treatment, similar to radish bran, and the sweet potato meat is bitter, which seriously affects the quality of sweet potatoes.

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