1. Symptoms mainly affect the leaves. Leaf spot round or suborbicular, born in semicircle of leaf margin or tip, 2 to 15 mm in diameter or more, brown margin, middle to pale brown to grayish brown, with obvious or inconspicuous surface Patterns, scattered on the wet or black particles that are conidia. The disease is sometimes associated with anthrax.
2. Control methods
1 Agricultural Measures During the rainy season, attention should be paid to the elimination of water accumulation in the fields and timely construction to improve the permeability of the planting area. Do a good job in field health, promptly clear the initial diseased leaves and reduce the bacteria source. Regular spraying foliar spray or foliar spray to make the plants robust.
2 In the early stage of the disease prevention and control, spray more than 40% sulfur sulfuric acid 500 times, 70% thiophanate-methyl wettable powder 600 times, or 50% compound thiophanate-methyl wettable powder 1000 times, or 72%. Ke Lu WP 600-800 times, 72% Ke Kang WP 60 times, or 50% WP 1500 times, or 58% Methion MnZn WP 500 times , Or 25% bactericidal WP 1500 ~ 2000 times, or 50% Isodermic WP 1000 times, or 77% can kill WP 600 times liquid and other agents, once every 10 days , A total of 3 to 4 times.
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