Garlic leaf blight is one of the common main diseases of garlic. It has occurred in different degrees in different periods, and it mainly damages garlic cultivated in open field. The number of precipitations during the growth period of garlic is more, and the incidence of heavy rainfall is heavy. Severe onset often causes plants to die, premature aging, garlic production, garlic mold rotten directly affect the yield, its pathogenesis and control methods are:
First, the symptoms
It mainly damages the leaves, and it also harms garlic sprouts in severe cases. The victim of the leaves started at the tip of the leaf and was initially a small white dot. After development, it was irregular or elliptical. It was grayish or gray-brown and developed downward. The upper half of the diseased leaf was withered. When it is wet, black moldy material is produced on it, and garlic sprouts are easily broken off from the disease department. Finally, the disease department produces a lot of black and small grain spots. When it is severe, it does not cause convulsions.
Second, transmission routes and conditions
The bacteria used mycelia or ascospora shells to survive over the winter in the soil left over from the diseased body, and the ascospore was released in the following year, causing initial infection. The diseased part produced conidia, which spread through the airflow and reinfected. Those areas that are weak and poorly managed are prone to disease.
Third, control methods
1. Agricultural control The soil with fertile soil and easy-to-drainage land is planted with garlic, and it is drained in time after rain. Sites with severe disease should be rotated for 2-3 years with non-harvested crops. Apply organic fertilizer and increase phosphorus and potassium fertilizers. Planting should not be too dense to facilitate ventilation and light transmission, promote growth, and enhance plant disease resistance. After the harvest, clean the pastoral area.
2. In the early stage of disease prevention and treatment, 75 chlorothalonil wettable powders 600 times, 64 antivirus WP 500 times, 50 retort wettable powder 500 times, 40 grams conjugated wettable powder 400 times can be used. Liquid, 50 pounds of sea WP for 1500 times liquid spray control. Spray once every 7-10 days, even spray 3-4 times.
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