The early stage of corn rust lesions was pale yellow, with small spots of chlorotic stains. Afterwards, the lesions gradually became round and uplifted. The lesions were tan-brown and later ruptured and rust-colored powder was scattered.
Control methods:
1, choose resistant varieties.
2, rational close planting, strengthen field management, reasonable fertilizer management, improve plant disease.
3. Chemical control: At the beginning of the disease, use triazolidine, polysulfide suspension, and speed poly. Follow the instructions to add water to make the spray at a suitable concentration. Prevent it once every 7-10 days. Apply 2-3 times. Use alternately. it is good.
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