Banana brown spot gray spot disease is the main disease of bananas, and timely pesticide control to improve banana quality and yield. China Pesticide Network Xiaobian collects relevant prevention and control materials for your reference:
Banana brown spot gray spot disease is invaded by the leaf surface or leaf back. The disease usually occurs in the lower leaves first, and then gradually spreads upward to the upper leaves, and initially produces light brown stripes or spots parallel to the veins on the back of the leaves. Small, oval-shaped, after the spot expands into a dark brown large spot, the central brown color, the edge color is dark, surrounded by a bright yellow halo, forming a large necrotic area along the leaf margin, irregular; the surface of the lesion is gray Mildew. The young leaves of bananas have been infested when they are unfolded, and they have been going through 35-45 days from the onset to the dryness of the whole leaves.
(1) Planting disease-resistant varieties to strengthen the management of banana plants, remove excessive buds, remove weeds, and rationally fertilize, paying attention to the reasonable ratio of nitrogen, phosphorus and potassium (1:0.4:2) to meet the demand for potassium in plants. Make plants grow stronger and improve disease resistance.
(2) Cut off sick leaves in time, burn or bury them deeply.
(3) In the early stage of the disease, it is recommended to spray 25% Shili emulsifiable concentrate 1500 times solution or 25% enemies (propiconazole) emulsifiable concentrate 1000-1200 times liquid, 75% thirteen morpholine emulsifiable concentrate 500 times liquid, 25~ Once every 30 days, or spray thirteen morpholine 0.6L per hectare, add 5.7L of mineral oil, add 50 ~ 70 (ml) emulsifier, water to 20 ~ 25L, once every 18 ~ 21 days, have good defense effect. Pesticide manufacturers recommend spraying 50% carbendazim WP 800 times solution, 70% methyl thiophanate WP 800 times solution, once every 10 to 15 days, even spraying 4 to 5 times. When preparing pesticides, you must strictly follow the standards to avoid phytotoxicity.
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