The garlic blight is mainly harmful to the leaves. In the early stage of the disease, the leaves are pale to pale yellow water-immersed spots in the middle of the leaves or at the tip of the leaves. The edges are light green and the lesions spread rapidly. Three to five days and a half of the leaves or the whole leaves are sag, when the humidity is high. The lesions rot, which produce sparse grayish white mold, which is the pathogen cysts and sporangia. The flower stems are stained with water and water, causing the whole plant to die. It is necessary to timely carry out pesticide control. Art Blade,Runner Art Blade,Utility Knife,Utility Blade Chunlei Quntification Co.,Ltd , https://www.hychunleitools.com
Occurrence law: the pathogen is the flagellate subtilis fungus. The pathogens are overwintered in the underground part of the diseased plant or in the soil by mycelium and chlamydospores. Spore vesicles and mobile spores are produced in the diseased part when the spring conditions are suitable. The spores spread by wind and rain and irrigation water for initial infection and reinfection. .
More rainfall, large amount of precipitation, more foggy days, higher temperatures, easy to develop. Generally, the temperature is 25 to 32 ° C, the relative humidity is higher than 95%, and the incidence is heavy under the condition of water droplets. Premature or excessively applied plots of nitrogen fertilizer are severe. The number of waterings is high, resulting in high humidity in the field, easy to be ill, pouring over large water and causing heavy rain. The density is too large, the foliar coefficient of the field is large, the lower leaves are poorly ventilated, and the humidity in the field is large, which is conducive to the rapid propagation of pathogenic bacteria.
Control method:
1 Agricultural control uses disease-resistant varieties, pay attention to drainage, prevent excessive moisture, and properly water. It is cultivated with small ridges or sorghum. Do not plant onion and garlic vegetables within 2 to 3 years of the disease, remove the sick body in time after harvest, and concentrate or bury it. Add organic fertilizer and biological fertilizer, potassium fertilizer, less nitrogen fertilizer, and enhance disease resistance.
2 In the early stage of chemical control, 72% cymoxanil-manganese-zinc wettable powder 800-1000 times liquid, or 72.2% frost-proof water-repellent 800 times liquid, 60% succinyl aluminum WP 500 times liquid can be used. , 58% metalaxyl · manganese zinc wettable powder 500 times liquid, 40% aluminum triethylphosphinate wettable powder 250 times liquid, 68% fine metal cream, manganese zinc water dispersible granules 300 times liquid, 64% fungicide The anti-wet powder WP WP 400 ~ 500 times liquid spray control. Spray once every 7 to 10 days, even 2 times. When the above bactericide is resistant, it can be controlled by spraying with 69% dimethomorph·manganese zinc wettable powder 1000 times.