First, the symptoms Corn rust mainly affects corn leaves. In severe cases, it can also invade the ears, loquat leaves, and even male flowers. At the onset of the disease, at the base of the leaf blade and on the upper main vein and on both sides, light yellow spots were scattered or aggregated, and after the protrusions formed reddish-brown freckle, ie, the pathogenic summer spores heap. Late lesions form black freckle, the pathogenic teliospores heap. When the corn rust occurs seriously, the leaves are covered with spore piles, causing a lot of leaves to dry, premature aging of the plants and incomplete grain, resulting in reduced production, and lighter people reduce production by 10%-20%, and the heavy ones reach 30%. When it is heavier, the leaves are broken off from the damaged parts and the whole plant is dry. Second, control methods 1. Breeding resistant varieties. 2, a reasonable fertilization. Formula fertilization, application of phosphorus and potassium fertilizer, to avoid partial application of nitrogen fertilizer, in order to improve plant disease resistance. 3, cultivation measures. Appropriate early sowing, reasonable close planting, cultivating loose soil, appropriate amount of water, pay attention to rowing and dehydration after rain, spray foliar nutrient when necessary, create a favorable environment conducive to crop growth and development, improve plant disease resistance, reduce The occurrence of disease. 4, pharmaceutical control. The role of chemical agents is to inhibit spore germination and prevent disease. (1) The application of spores at the peak of the spores inhibited spore germination. 97% of the enzymic eruna drug 250-350 times, 50% of the eutectic WP 800 times. (2) In the early stage of the onset of corn rust, medication is used for prevention and treatment. 25% Triadimefon WP 1500-2000 Diluent, 50% Carbendazim WP 500-1000x, 20% Versilight EC 400x, 40% Fuxing Emulsion 9000x, 50% Colloidal Sulfur 200 times liquid spray. 7-10 days once, continuous prevention and treatment 2-3 times. 5. After corn is harvested. Collect and burn diseased plant debris to reduce the source of infection.
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Corn rust prevention and control work