In the past two years, corn rust has generally occurred in summer corn fields. The onset of the disease is concentrated and spreads rapidly, causing the leaves to die prematurely, which seriously restricts the yield and quality of corn.
Maize rust occurs in various parts of the corn plant, mainly in the infected leaves, in severe cases can also infect the ear and temporal lobe. In the affected area, the color of lesion changed from milky-yellow-yellow-brown, and eventually became red-brown. After the epidermis ruptured, rust-like uredia spores were emitted, and the infection could be repeated. When the corn rust occurs seriously, the leaves are covered with spore heaps, causing a large number of leaves to dry, premature aging of the plants, and the grain is not full, resulting in a reduction in production, light production loss of 10% to 20%, and weight of 30%. When heavier, the leaves are broken from the victim's site and the whole plant is dry.
Corn rust is an epidemic disease that spreads through the air flow. Prevention and control should be based on the cultivation of disease-resistant varieties on the basis of combination of cultivation and drug control measures.
Agricultural control. Timely sowing, reasonable close planting, promotion of basic application N, P, K compound fertilizer and foliar spraying of potassium dihydrogen phosphate solution, to avoid partial application of nitrogen fertilizer, in order to improve the corn's anti-infection ability. Strengthen field management, remove weeds and sick bodies, and concentrate deep or burn to reduce the source of infection. Low-lying plots of water must be drained in time.
Chemical control. Based on the "prevention-based" approach, medication should be administered immediately in the early stages of rust disease. Can be used with 15% triadimefone powder 100 ~ 150 grams or 25% triadimefone EC 100 ~ 120 grams and 12.5% ​​diniconazole powder 50 ~ 60 grams of water 30 kg uniform spray. Severely affected plots were sprayed twice, with intervals of 7 days.
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