Li Qiang, Xuzhuang Town, Tongshan County, said on the 18th of March that his garlic in more than 4 mu of land has recently developed. The diseased plant leaves have red, yellow, shriveled leaves, and the plants are not long. The field strain rate is up to 2%. . According to the preliminary diagnosis of the technical staff of the township agricultural technology station, garlic had purple spot disease. He asked whether the garlic had purple spot disease and what medicine was used to prevent it. A variety of pathogens can cause garlic tip redness and yellowing. Shrinkage, plants are not long and other symptoms. Field diagnosis needs to examine more symptoms. Garlic purple spot disease mainly damages leaves and pedicels. The affected area is initially stained with water-stained white dots, and is slightly sunken. After that, it gradually expands into a yellow-brown to brownish brown mold layer, and when severe, it causes the leaves to yellow and die or break. The pathogen is Aspergillus spp. The mycelia spread over winter in the host body or along with the diseased body in the soil. The next year, conidia are emitted and transmitted through air currents or rainwater. They penetrate through the stomata, wounds, or directly penetrate the epidermis. The incubation period is 1-4. day. According to the report of the occurrence and control of garlic purple spot caused by Zhang Cuiling and Liu Chenglin from Chenzhou Plant Protection Station, garlic pests and diseases have been aggravated year after year in garlic and Quzhou. Garlic purple spot caused about 8% loss every year. In severe years, the loss is up to 17%, which affects the yield and quality of garlic. The disease usually starts from the beginning of March 25-30, April 10-15 is the beginning of the onset of disease, on April 20 before and after the onset of the peak. The disease is often accompanied by downy mildew or a mixture of leaf blight, the appropriate temperature for the disease is 25-27 °C, not less than 12 °C. Germs produce spores that require high humidity, and germination and intrusion require the presence of water droplets. Therefore, the warm and humid spring is generally heavy. Sandy soil, dry land, dry seedlings or old seedlings, and fertilizer-deficient fields are susceptible to disease. To prevent and treat garlic purple spot disease, comprehensive measures should be taken. Agricultural measures include: Non-onion and garlic vegetables for more than 2 years of rotation; Shizu base fertilizer, per acre Shi high-quality soil-fertilizer 3000-4000 kg, increase the application of phosphorus and potassium fertilizer; use of garlic, disease resistance is good Cangshan big white Such species; close planting in a reasonable manner, cultivating strong seedlings, and enhancing the disease resistance of plants; removing diseased plants, removing diseased leaves, and removing diseased bodies completely after harvesting. After the onset of the disease, the drug is used for prevention and treatment in the early stage of the disease. You can use 500mg/litre iprodione WP wettable powder 1500 times, or 58% rosin MnZn wettable powder 500 times, or 25% chloramphenicol wettable powder 1000 times, or 2% more Antimycin WP 700 times spray, every 7-10 days once, continuous control 2-3 times.
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