1 symptoms
The main damage leaves, diseased leaves spread from the bottom up. In the early stage, there was a pale yellow dot on the leaf, and the edge was not obvious. After being limited by the veins, it expanded into a polygonal lesion. When the humidity was high, the back of the lesion grew a grayish-black or off-white mildew layer, and the leaves of the whole plant were yellow withered when severe.
2 Pharmaceutical control methods
At the beginning of the onset, 58% of nail cream is used. Manganese zinc wettable powder 500 times liquid is sprayed on the back of the leaves or closed in the evening. 45% of chlorothalonil aerosol 200-250 grams per acre is smoked or 5% per acre. Bacteria clear dust or 5% cream urea. Manganese zinc dust 1000 grams sprinkled.
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