In recent years, the occurrence of white rot in grapes has been aggravated year by year, and the occurrence and control techniques of the disease are described as follows.
1. Symptoms mainly affect the leaves, shoots, cobs and fruits. At the beginning of the disease, first from the cob or small fruit stem close to the ground, light brown irregular water-spotted lesions appear, gradually spread to the fruit, the incidence of fruit in the base first becomes light brown, soft rot, after The whole grain turned brown and rotted, and the fruit stems shrank.
2. Pathogens and Occurrence Laws Diseases and debris that are scattered on the ground and in the topsoil are the major sources of infection at the beginning of the year. Bacteria can survive in the soil for more than 3 years. On the base of the conidiospores on the fruit, there are some dense mycelia, which have strong resistance to adverse environments and can survive for more than 10 years in dry spikes. Conidia spread by rain and spread through the wounds of the plants. The climatic conditions of high temperature and high humidity are major factors in the occurrence and prevalence of the disease. Poorly soiled orcharded orchards have a heavy incidence; heavy orchards with poor ventilation have a heavy incidence; individuals with a large amount of load are also affected; fruits enter the coloring and maturation stages, and their degree of susceptibility is gradually increased.
3. Prevention and control techniques to clear the disease source: timely removal of diseased leaves and diseased fruit in the growing season, cutting off diseased vines, and collecting ground defoliation, ears, vines, granules, and other diseased bodies immediately after the autumn harvest, clean and remove the infection source. Reasonable fertilization: Fertilization is mainly based on organic fertilizer and base fertilizer, and appropriate nitrogen fertilizer is applied before flowering to promote shoot growth. After the results, nitrogen, phosphorus and potassium were applied in combination with appropriate application of trace fertilizer to improve the disease resistance of the plant body. Strengthen the cultivation and management: reasonable pruning, improve the results of the site, to reduce the chance of pathogen infection; vines in a timely manner, picking the heart, hit the shoots and the appropriate sparse leaves and thinning fruit, improve ventilation and light conditions, do a good job in drainage work, reduce humidity. Chemical control: After grape results, the lower ear should be checked frequently to remove the diseased ear in time. 70% thiophanate-methyl 1000-fold solution, 50% trehalose 500-fold solution, 50% thiram 500-fold solution, 80% phosphine-aluminum 800-fold fluid, etc. When mixed with potassium dihydrogen phosphate and other leaf surface fertilizer. Severe disease parks can be used to spread sterilizing drugs to the ground during the initial stage of the disease, such as 1 part of thiram, 1 part of sulphur powder, 2 parts of calcium carbonate, and 1.5 to 2 kilograms per 667 square meters. Sprinkle once every half month. A total of 3 to 4 times, at the same time with the spraying of pesticides, spraying the effective agent "Sang Lan 990A" 500 times the liquid; or use 3000 times the sterilized fertilizer type 3000 to spray two or three times.
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1. Commodity name: Fresh Onion
2. Feature: Natural color, Thick and full skin, No stain and soil on outer skin, Firm and no rotten.
3. Size: 3.0-5.0cm, 5.0-7.0cm, 7.0-10cm
4. Variety: Yellow Onion and Red Onion
Fresh Onion
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