Occurrence and Control of Garlic Blight

I. Symptoms Garlic diseases mainly damage the leaves. In the early stage of the disease, pale white to light yellow water dips in the center of the leaves or leaves. The edges are light green, the lesions spread rapidly, and the leaves or the entire leaf fall for 3 to 5 days. When the humidity is high, the lesions rot and the whole plant dies. Second, pathogens and transmission of pathogenic bacteria with mycelium and chlamydospore in the underground part of the disease plant or soil overwintering, when the conditions of late spring suitable disease Department of sporangia and fluid spores, mobile spores by wind and rain and spread of irrigation water, at the beginning Infestation and reinfestation. Third, the impact factor 1. Large amounts of precipitation, high temperatures, and high foggy days are prone to disease. Generally, the temperature is 25°C to 32°C, and the relative humidity is higher than 95%. The occurrence of water droplets is more severe. 2. There was a certain difference in the degree of disease among the varieties and sowing dates. The sowing date is too serious. Sowing according to local conditions is the key link. 3. The management of fertilizer and water management increases organic manure, phosphate fertilizer, and potassium fertilizer. However, the excessive application of nitrogen fertilizer on the plots is more severe. Under different conditions, the incidence of poor fertility is heavier. There are many times of watering, and the humidity in the field is easy to be affected. For this purpose, when watering, it depends on soil moisture and weather changes. 4. The proper planting density of garlic is 35,000 plants per acre. The higher the density is, the heavier the disease is. The main reason is that the density is too large, the leaf surface coefficient of the field is large, the ventilation of the lower leaves is poor, and the humidity in the field is large, which is conducive to pathogenic bacteria. Rapid propagation. Fourth, comprehensive prevention measures The selection of disease-resistant varieties should be based on local conditions or use better local or foreign varieties such as "high", "Po tree" and so on. 2. Pay attention to drainage, prevent excessive humidity, and properly water. 3. After the harvest, the diseased body was promptly removed, and was deeply buried and burned. 4. Promote the application of organic fertilizers and biological bacterial fertilizers, potash fertilizers, and less nitrogenous fertilizers to increase disease resistance. 5. At the beginning of the disease, 72% Kelu WP can be sprayed 800 to 1000 times, 72.2% Precair 800 times, and M-45 wettable powder can be used 600 to 800 times. 7 to 10 days spray 1, control 2 times.

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