(1) Regular occurrence of corn brown spot disease is a fungal disease, and its pathogen is the genus Jade, which belongs to the genus Flagellate. The pathogens overwinter in the soil or diseased bodies by the dormant sporangia. In the second year, they spread to the corn plants by the wind and rain. When they meet the appropriate conditions, they sprout a large number of zoospores, and the zoospores swim in the water droplets on the surface of the leaves and form Infecting silk, invading the tender tissue of corn. In the middle and late stages of corn growth, there are many rainy and rainy weathers, especially in high-humidity and high-temperature conditions, which is conducive to disease occurrence; low-lying land and continuous cropland are seriously affected.
(II) Control methods Agricultural disease control uses disease-resistant varieties, and severe disease is carried out for more than 3 years; reasonable fertilization and watering in the corn growing period promotes robust growth of plants and enhances disease resistance; corn is completely removed after harvest, and timely Deep turn, reduce the source of overwintering bacteria.
Pharmacy prevention and treatment before the onset or early onset, timely use 20% powder rusting emulsifiable concentrate 3000
Spraying liquid, 50% carbendazim WP 500-800 times or 25% enemy de-emulsion 1500 times, spraying once every 7-10 days, spraying 2-3 times; if adding appropriate amount in the liquid Foliar fertilizers such as foliar treasure, potassium dihydrogen phosphate, and urea are more effective. When spraying, focus on spraying the middle and lower leaves and sheaths.
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