Lettuce brown spot is a fungal disease that primarily harms leaves. Symptoms: One is water-stained at the beginning of the disease, and then gradually expands to a round to irregular shape, with brown to dark gray lesions; the other is dark brown lesions with irregular edges and watery stains on the periphery. Halo. When the ambient humidity is high, dark gray mold is formed on the lesions. In severe cases, the lesions merge with each other, causing the leaves to become brown and dry, which greatly reduces the yield and benefit. So, how prevention lettuce leaf spot it?
The first is to eliminate the source of the disease. Before the land preparation, the sick body will be taken out of the garden and burned to reduce or eliminate the source of the disease.
The second is to rationally fertilize and water. After deep-drying the ground, apply appropriate amount of quicklime, apply enough organic fertilizer, apply formula fertilization, increase the application of phosphorus and potassium fertilizer, avoid partial application of nitrogen fertilizer, and avoid causing longevity. Reasonable watering, one watering should not be too large, control the humidity in the field.
The third is chemical control. In the early stage of the disease, it can spray 40% sulfur suspension 500 times solution, 75% chlorothalonil wettable powder 1000 times solution and 70% methyl thiophanate WP 1000 times solution, 50% chlorhexidine WP 1200-1500 times. Liquid or 60% succinylphosphine aluminum wettable powder 500 times liquid, etc., spray once every 10 days, continuous control 2-3 times. Stop taking the drug 5-7 days before harvesting to ensure safe food for sale.
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