Dry rot control measures for corn

1. Symptoms: The corn can be killed during the growth period, and it is heavier when it grows later. Injury stems and ears. The stalks at the base of the stalk and at the culm were brown, dark brown, and purplish red. The culms were severed from the diseased part. The ear of the disease is loose and easy to be broken, and the grains below the ear become brown and dull. The white mycelium is often present between the grains, and the diseased ear and the temporal lobe adhere to each other and are not easily peeled off.

2, the incidence of the law: dry corn rot disease with mycelium and centuries in the diseased plant residues and seeds overwintering, corn growth seasons produce contagious air flow, high temperature and rain is conducive to the spread of pathogens and disease. Seed carriers are the main route of long-distance transmission. Precipitation after sowing, soil moisture, low temperature, seedling growth is weak, easy to disease.

3. Measures for prevention and control: (1) Selection of agricultural measures and selection of disease-resistant varieties. A 2-3-year rotation is carried out to deepen the schizophrenic soil in the autumn, clearing sick and sick organizations in the field and reducing the source of infection. Strengthen the cultivation and management, timely sowing, increase organic fertilizer, etc., to cultivate strong seedlings and improve resistance to disease. (2) Chemical control Soaking with 50% carbendazim WP 1000 times before sowing for 24 hours. After soaking, rinse with water to sow. The heading stage was sprayed with 50% carbendazim WP or 50% thiophanate-methyl wettable powder 1000 times. Focus on spraying the ear and the lower stems and leaves, spraying again every 7 days.

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