Maize big spot mainly infects leaf sheaths and leaves, temporal lobe. In the early stage of disease, water-soaked blue-grey spots appeared on the leaves, and then they gradually expanded along the veins toward the two ends to form a central yellowish-brown, brown-colored shuttle-shaped large spot. When the temperature is high and the humidity is high, the lesions produce a large number of brownish brown mold layers on both sides of the leaf, namely the conidiophore and conidia of the pathogen. Lesions can bind contiguously to make plants die early. Prevention: (1) Selection of disease-resistant varieties. (2) Clear the field sickness, concentrate burning, or deep plowing, buried the pathogen. (3) Strengthen field management, timely timely sowing, reasonable close planting, increase organic fertilizer, timely top dressing, timely irrigation, and timely drainage after rain. In addition, no-tillage and continuous cropping will aggravate the occurrence of diseases. (4) Pharmaceutical treatment: thiophanate methyl was sprayed 2-3 times. Use 50% carbendazim WP 500 times, or 50% TB wettable powder 800 times, or 80% dexamethasone WP 500 times, or 75% chlorothalonil WP 500 ~800 times liquid, spraying 1 to 2 times during the flowering period of corn, spraying once every 10 to 15 days.
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