Recently, readers of the Tang and Lingshou groups came to the phone and asked that due to the repeated planting of cold-shedded potatoes for many years, the pests and diseases have been increasing year by year. Among them, the incidence of potato mealy mildew is more serious, and it is very good to prevent them. Potato mealy mildew is a flagella flagellum fungal disease. Whitefly disease mainly damages the tubers and roots, and sometimes the stems are also infected. Once the disease is infected, the appearance of its commodity potato will be greatly reduced, and the price will be lowered, which will seriously affect the economic benefits. In the early stage of tuberculosis, small brown spots appear on the epidermis, with semitransparent halo rings on the periphery. After the small spots gradually bulge and expand, they become "freckle" with a diameter ranging from 3 to 5mm. The epidermis has not yet broken and is powdered.痂 “ 疱 疱 疱 "closed 疱 阶段" phase Followed by the development of the disease, the "freckle" epidermis ruptured, reversed, the subcutaneous tissue was orange-red, and a large number of dark brown powders (sporangium spheres) were scattered. The "freckle" subsidence was crater-like, and there were cork bolts outside. The halo ring is a “open pod†stage for whiteflies. The side of the root that is infected with the root grows out of soy-sized or aggregated nodules. There are many causes of whitefly disease in potato. One is the transmission of seed potatoes. The second is the late growth period of potato, the rapid expansion of potato pieces, long-term water holding capacity in the field is large, there is a big relationship. Third, the soil organic matter content is low, the soil ventilation is poor, and the occurrence of acidic pH in the soil will increase the incidence of disease. Fourth, the availability of boron and calcium in the soil is severely deficient, and it is also an increase in the incidence rate. 1. Select disease-free seed potatoes. We must harvest, store, and sow off crops, remove diseased potatoes, and if necessary, soak for 5 minutes with 200% trichloroisocyanuric acid 1000 times solution or 40% formalin 200 times solution, and then cover with plastic cloth for 2 hours. , Let dry sowing. 2. During site preparation, 300-500 kg of microbial organic fertilizer, 40-50 kg of organic calcium fertilizer of green primal oyster, 300 gram of wolfberry granule zinc, and 150 gram of eucalyptus granule boron are used as base fertilizer per acre. 3. When the potato is budding, it is necessary to use 1~2kg of microbial agent + 500ml/100ml of sugar alcohol chelated calcium per mu, or 2~3 bottles of 500ml/100ml of fruit and vegetable calcium fertilizer. 1 to 1 kg of Cobo (Manson Manganese Zinc Bordeaux Liquid) can play a very good preventive effect. 4. In the late growth stage of the tuber, the amount of water in the field must be controlled so that it will be dry and wet. The watering is prohibited 7 to 10 days before the harvest to promote the ripening of the tubers. Dried fruit products as the name implies, dried fruit products are pre-treated fruits after selection, washing and dehydration to the water content of 15 ~ 25% products. The volume of dried fruit is about 11 ~ 31% of that of Fresh Fruit, and the weight is about 10 ~ 25% of that of fresh fruit, so it can significantly save the cost of packaging, storage and transportation, and it is easy to eat and carry. Common dried fruits are raisins, red dates, dried mango, dried kiwi, dried strawberry and so on. Dried Fruit,Dried Mango,Raisins,Red Dates,Dried Kiwi,Dried Strawberry Xi'an Gawen Biotechnology Co., Ltd , https://www.seoagolyn.com
How to prevent potato plague in cold house