First, the hazard characteristics
Corn brown spot is a fungal disease that seriously damages corn yield, mainly in corn leaves, sheaths and stems. The lesion first occurs at the tip of the top blade, initially pale yellow, gradually turning into a tan or dark brown, round or oval. Small lesions often come together. In severe cases, several or even all of the lesions appear on the leaves, and large brown spots appear on the sheath and veins. At the end of the disease, the epidermis of the lesion was ruptured, the leaf cell tissue was necrotic, and brown powder was scattered. The veins and vascular bundles remained as filamentous. Once the susceptible variety is infested by the pathogen, the whole plant leaves will quickly produce a large number of small yellow spots, and the leaves will dry quickly.
Second, prevention and treatment methods
1. Agricultural measures. Pay attention to the elimination of water in the field, reduce the humidity in the field, timely weeding and weeding, promote the healthy growth of plants and improve disease resistance.
2. Chemical control. Use 25% of rust-negative WP 20g per acre; or 70% of methyl thiophanate 70g per acre; or 50% carbendazim 50g per acre; or 12.5% ​​of granules 30g per acre, water 30 kg. In order to improve the control effect, it is possible to add some foliar treasure, potassium dihydrogen phosphate, urea, etc. in the medicament to promote the robustness of the corn and improve the disease resistance of the corn. The spraying interval is about 7 days, even spraying 2 or 3 times. Pay attention to the uniformity of the spray when spraying. In case of rain within 6 hours after spraying, it should be sprayed in time after the rain.
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