Potato should be prevented from ring rot before sowing

Potato ring rot is a common disease, but because the symptoms of potato tubers, especially the external symptoms are not obvious, it is easy to cause cutting infection; second, after the development of the disease during storage, often a large number of rot, resulting in sufficient sources of the disease. The following situations often occur in production: rotten seeds in the process of accelerating germination; no seedlings after sowing; death after emergence; formation of diseased plants, few tubers, small tubers, rotten seed potatoes, resulting in short ridges and serious lack of seedlings.

The disease is a bacterial disease with a short survival time in the soil, mainly overwintering in the potato block, and can spread with the diseased potato over a long distance. As long as the seed potato is free from the disease, there will be no diseased plants in the field. Therefore, pre-sowing prevention and control is very important.

The prevention and control measures are self-propagating, and the diseased potatoes should be removed while harvesting; after the tubers are harvested, they should be spread out in a ventilated place for 2-3 weeks, so that the tubers can enter the mature dormancy stage. Enter the cellar when the temperature is stable at 0 ℃. Before entering the cellar, the seed potato is strictly selected and the sick rotten potato, mechanical damage, insect injury, flooded and cold-damaged potato pieces are removed. Storage, choose places with good drainage from the wind and the sun. Ensure ventilation during storage

Disease-resistant varieties suitable for local planting were selected, such as Luyin 1, Zhengshu 4, Kexin 1, Wumeng 684, 697, 715 and so on.

Advocate small whole potato sowing, first whole potato teeth before cutting, knife strict disinfection. Small whole potato has strong vitality and good disease resistance, while avoiding cross-infection such as ring rot bacteria, poor section healing and the invasion of saprophytic bacteria. In production, it is advocated to give priority to the selection of small whole potatoes as seed potatoes. When it is necessary to cut the potato, it is recommended to sprout the whole potato first and cut it now before sowing, so as to avoid the long contact between the section and the section. Strict selection and elimination of diseased potatoes before budding. When cutting potatoes, each person should prepare a knife as much as possible. The knife should be disinfected with alcohol or flame first. When the section is observed, it is found that when the vascular bundle changes from milky yellow to dark brown, first remove the diseased potato, and then change the knife. Before cutting, soak the knife in 50 mg / L copper sulfate solution for more than 10 minutes.

Plant ash mixed with seed section and sprinkled with a layer of plant ash, not only keep the section dry, control bacteria, but also increase the application of potassium fertilizer, drought and cold resistance.

The chemical was evenly sprinkled with 50 mg / kg of copper sulfate poisonous soil in each hole.

The proportion of nitrogen, phosphorus and potassium was about 2.5 ∶ 7 ∶ 4.5.The calcium superphosphate was used to supplement calcium, and ridging planting enhanced the disease resistance of the plant.