Maize leaf spot and leaf spot mainly damage the leaves and sometimes invade the leaf sheath and temporal lobe. In addition to damage to the above sites, small spot disease can also damage the ear. In many regions, these two diseases are collectively referred to as "maize spot disease." 1. Symptom identification: The typical symptoms of corn leaf spot disease are rapid expansion and growth of large prismatic spots from small lesions, up to 10-30 centimeters severe. Sometimes several lesions are connected together to form irregular large spots. . The lesions were initially immersed in water and quickly turned to gray-grey. They eventually turned brown and dead spots. When the air was wet, black molds, namely conidiophores and conidia, could grow on the lesions. The symptoms of corn leaf spot are characterized by small lesions, generally no more than 1 cm in length, and only limited in width between two veins, nearly elliptical, with a darker rim of the lesion. In addition, the number of lesions is generally more. The pathogens of corn leaf spot and blight were overwintering on conidium-attached diseased remnants, or latent in myasthenia in the diseased tissue, and the second year spore germination caused initial infection. Plants produce a large number of conidia, spread by wind and rain, causing re-infection. 2. Influencing factors: Germination, invasion, and formation and spread of spores of germs all require certain climatic conditions, of which temperature and humidity are the main ones. The optimum temperature for the formation, germination, and infestation of P. fulgidus spores is 20–25C0. The P. blight is slightly higher than P. sativae, and the optimum temperature is 20–32C0. Therefore, the spotting is more serious in the summer corn planting area, and the large spot disease occurs. It is more serious in the spring corn area. 3. Control methods: The epidemic of diseases is determined by three factors: first, planting susceptible varieties in large areas; second, there are a large number of pathogens; and third, there are environmental conditions suitable for disease development. Therefore, the prevention and treatment of diseases should start from these three aspects. (1) Selection of disease-resistant varieties: This is the fundamental approach for preventing and treating large and small spot diseases. The resistance of different varieties to diseases has obvious differences. (2) Elimination of overwintering bacterium sources and reduction of bacterial count at the early stage of disease: Rotation of crop rotation can reduce the amount of bacteria. In addition, after the harvest of corn, field residues should be completely removed and deep-dipped in time. This is an important measure to reduce primary infection sources. (3) Chemical control Orbital 40% chlorsulfuron or 70% mancozeb WP spray 600 times. 50% Carbendazim wettable powder 500 times, or 70% thiophanate-methyl wettable powder 500 times spray. The application of pesticides should be started at the beginning of the disease, so that the development of the disease can be effectively controlled, and spraying again and again after about 7 days.
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