Harm of garlic leaf blight and its control technology
Garlic leaf blight is one of the main diseases of garlic. It occurs in different degrees in different periods, mainly affecting garlic cultivated in open fields. Garlic has a large number of precipitation during the growing season, and the incidence of heavy rainfall is heavy. When the disease is severe, the plant often causes death, premature aging, reduced garlic production, garlic moss and mildew, which directly affects the yield. Its pathogenesis and prevention methods are: First, the symptoms It mainly harms the leaves and, in severe cases, also harms the garlic. The damage of the leaves begins at the tip of the leaf. At the beginning, it is white with small dots. After development, it is irregular or elliptical. It is grayish-white or gray-brown lesions, which develops downward and the upper part of the diseased leaves die. When it is wet, it produces black mold on it, and the garlic is easily broken from the diseased part. Finally, the disease part produces many black small grain spots, and when it is serious, it does not convulsion. Second, the route of transmission and disease conditions The pathogens are overwintered with the mycelium or ascospores with the diseased remains. The ascospores are released in the following year, causing initial infection, and the conidia are produced in the diseased part, and spread by the airflow to re-infect. Any land that is weak and poorly managed is prone to disease. Third, prevention and treatment methods 1. Agricultural control Choose garlic that is fertile and easy to drain in the soil, and drain it in time after rain. The plot with heavy disease should be rotated for 2-3 years with non-onion garlic crops. Apply sufficient organic fertilizer and increase phosphorus and potassium fertilizer. Planting should not be too dense, in order to facilitate ventilation and light, promote growth and enhance plant disease resistance. Clean the garden in time after harvest. 2, in the early stage of drug control, you can choose 75 chlorothalonil WP 600 times solution, 64 antivirus WP WP 500 times solution, 50 bacteriostatic WP 500 times solution, 40 grams of bacteria WP 400 times Spraying and controlling the liquid, 50 chlorhexone wettable powder 1500 times liquid. Spray once every 7-10 days, even spray 3-4 times. More pesticide knowledge , please pay attention to China Pesticide Network Other Machinery Parts,Construction Equipment Parts,Earthmoving Parts,Hyundai Machine Parts JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.stszcmparts.com