Corn leaf spot disease, also known as Cercospora leaf spot, is the most common leaf disease in corn. When the disease is severe, most of the leaves become yellow and dry and scorch. The ear drops, the grain looses, and the grain weight decreases, which seriously affects the yield and quality.

Symptoms: The disease mainly occurs on the leaves, leaf sheaths, and temporal lobes of late-to-mature corn growth. At the beginning of the disease, water-stained light-brown spots gradually expand into light-brown stripes or irregular gray-to-brown long-stripes, which extend parallel to the veins and are rectangular in shape. The lesion is gray in the middle and has brown lines on the edges. The lesion size is 0.5-20mm and 0.5-2mm. The pathogenic bacteria first infect the lower part and cause disease. Sometimes the diseased spot is contiguous. When the weather conditions are suitable, it can be expanded to the entire leaf and the leaves die. In the later stage of the lesion, a white or gray mold layer is formed on the back of the leaf, ie, the conidiophore and conidia of the pathogen.

Second, prevention and control methods: 1, selection of disease-resistant seed. 2. Implement large-scale deep turning and rotation, strengthen field management, timely drainage after rain, reduce the humidity in the field, and promptly remove and destroy field residues after harvest. 3, combined with soil testing formula fertilization, scientific and rational fertilization, to promote robust growth of plants, improve disease resistance. 4. Chemical control: After corn flowering and pollination or at the early stage of disease development, chemical control is mainly carried out during the three key periods of corn horn, tasselling and initial filling, and it is best to spray from the lower leaves of the corn to the upper part of the blade when spraying. Application, spray wet on each blade. Because the gray spot disease of corn begins with the damage and spread of the leaves from the bottom of each corn, the purpose of spraying the leaves first is to control the spread of pathogenic bacteria in the lower leaves. Pharmacy selection can be used 25% propiconazole 1500 times or 25% tebuconazole 1500 times or 50% thiophanate-methyl 500 times alternating spray.

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