Garlic field susceptible to leaf blight, gray mold, root lice, onions and other pests and diseases, should pay attention to timely prevention and treatment.
Disease (1) Leaf blight. The disease is a fungal disease. The pathogens mainly overwinter on sicknesses. Under conditions of adequate rainfall and temperature, leggy and weak seedlings are susceptible to disease due to excessive nitrogen fertilizer application. The pathogens mainly invade the leaves and pedicels, and they mostly start from the tip of the leaf and gradually expand downward. A white, round, round spot first appeared, followed by an enlarged lesion, dense black powdery mildew layer, and the last leaves and pseudostems yellowed and died, and were broken off from the diseased part. In severe cases, garlic is not easy to twitch. Control methods: Strengthen field management, improve disease resistance of plants; remove diseased bodies in time and focus on treatment; use 75% chlorothalonil WP overnight 600 times or 70% Mancozeb WP; Liquid spray. (2) Gray mold. The disease is a fungal disease, which mainly damages the leaves. It mostly occurs in the late and late stages of plant growth. The lesions are water-stained at the beginning, followed by white or gray-brown, and the lesions expand to form fusiform or oval-shaped gray and white spots. The leaves and even the entire leaf surface are covered with a taupe villus layer, and the pseudostems of the diseased plants and the underground garlic are rotted. The bacteria overwinters the mycelium on the soil or the diseased body. Control methods: Strengthen field management, close planting, timely drainage and rainwater after rain, increase phosphorus and potash fertilizers, and increase plant disease resistance; Spray 70% mancozeb WP 500 times or 50% Pythium in the early stage of disease. Lee WP 1500 to 2000 times liquid.
Pests Common pests in the garlic field include root lice, onion thrips, leaf miners, and nymphs. Control methods: Apply adequately decomposed organic fertilizer as base fertilizer, and properly separate garlic seed from fertilizer; where the root rot is seriously endangered, use 90% crystals of trichlorfon per acre to dissolve 750 grams of water and add 50 kg of water. Sprinkle on 750 kg of waste soil. After the mixture is applied, the root soil of the plant can be sprayed with a 1000-fold solution of 90% trichlorfon. Control of onion thrips and leaf miners can be sprayed with suitable insecticides.
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