Banana scab is a fungal disease, which is caused by the infection of the fungus Mycelium Banana, which mainly damages the leaves and green fruits. In susceptible leaves, many small dark brown to black spots appear on the leaves at the beginning, densely integrated into a heap, like soot, and appear as stripes from the midrib to the edge of the leaves; then the spots expand, the outer edge has a pale yellow halo, and the center is light yellow. Brown or gray. Seriously damaged leaves turn yellow and wither and die prematurely. The damaged green fruit often produces many scattered or dense dark brown granules, short stripes and round or oval lesions on the curvature of the back of the fruit and the epidermis of the upper part of the fruit finger. The lesions are brown on the periphery and have a light yellowish brown halo on the periphery. When the fruit matures, the disease is aggravated, the surface of the fruit surface becomes dark, the diseased fruit is unevenly soft and ripe, the diseased tissue is rotted and subsided, and many small black spots are born.

Control methods

1, not partial nitrogen fertilizer, especially before and after budding banana plant more less nitrogen fertilizer, organic fertilizer and potash fertilizer added to promote the growth of plants and young fruit robust.

2. In the early stage of disease, 250/l pyraclostrobin EC can be used 84-250/mg/kg, 250g/L Diphomycloprazole EC 84-125 mg/kg, 22.5% picoxystrobin suspension 143 -167 mg/kg spray, once every 5 days, 2-3 times in succession, alternating use.

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