First, the symptoms
The main damage leaves, starting from the old leaves. The first is the appearance of pale green lesions on the foliage, which gradually enlarges to a yellowish-yellow color. The lesions are irregular or polygonal due to the limitation of veins. When the humidity is high, a white frosty mildew layer is formed on the back of the leaves. When the leaves are severe, the leaves are yellow. The color is dry.
Second, the incidence conditions
The bacteria can be attached to seeds, sicknesses or soils and spread by rain or air flow. The optimum temperature is 14-20 degrees and the relative humidity is more than 90%.
Third, control methods
1, with 69% of Kean manganese zinc WP 0.15 kg, 120 kg of water spray;
2, with 40% of the epidemic frost spirit 0.3 pounds, 120 pounds of water spray;
3, with 58% metalaxyl manganese zinc WP 0.25 kg, 120 kg of water spray;
4, with 72% of Meng Zhuangshuang urea wettable powder 0.2 kg, 120 kg of water spray;
5. Use 72.2% of Propomos Water 0.2 kg and spray 120 kg of water;
6, with 25% of metalaxyl water agent 0.2 kg, 120 kg of water spray;
The above pesticides are used alternately, sprayed once every 7 days, sprayed 2-3 times in a row, and the spray must be meticulous and thoughtful, especially the back of the old leaves.
In addition, in cultivation, it is necessary to rotate crops with other different families, remove old leaves, clean the pasture, reduce the source of pathogens and re-infestation.
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