How to prevent corn seedling blight?
Maize seedling blight is a newly discovered disease. Viewing from the fields, the occurrence of heavy weight on Yandan No. 17 corn is basically not affected by dressing with Shile.
After the diseased plant was found, the mixture was sprayed with mitomycin 6000 at a ratio of 96% and Tianda 2116 at 1000 times for 10 days and sprayed once again after 10 days.
How to prevent corn rough dwarf disease and dwarf mosaic disease?
Maize rough dwarf disease and dwarf mosaic disease are transmitted by aphids and migratory locusts. On the basis of seed dressing, at the four-leaf stage of the corn, they are sprayed with 3% Tianda acetamiprid 2000 times and Tianda Yufeng 1500 times. It can completely prevent viral diseases. The land where the virus disease occurs is treated with Tianda Yufeng 1000 times and 1000 times Tianda 2116 mixed spray, which has a good inhibitory effect.
How to identify and control corn large and small leaf spot disease?
Maize big spot disease and corn leaf spot mainly damage the leaves and sometimes invade the leaf sheath and temporal lobe. In addition to damaging these sites, small spot disease can also harm the ear. These two diseases are often collectively referred to as "corn spot."
The typical symptoms of corn spot disease are rapid expansion from small lesions to large rhomboids, up to 10-30 centimeters in length. Some long spots even exceed 30 centimeters. Sometimes several lesions are connected together to form irregularities. Big spot. The lesions were initially immersed in water and quickly turned blue-gray, eventually turning brown with dead spots. When the air is wet, black molds can grow on the lesions.
Symptoms of corn leaf spot are characterized by small lesions, generally no more than 1 cm in length, and limited to only two veins, nearly elliptical, with a darker, darker rim. In addition, the number of lesions is generally more. The pathogenic bacteria of large and small spotted corn are overwintering on contaminated spores on the contaminants, or wintering on mycelia in diseased tissues, and the first infection caused by spore germination in the second year. Produce a large number of conidia, causing re-infection.
Prevention and control points: At the beginning of the disease, 50% of the enemy will be used for 0.5 kg, or 50% of thiophanate-methyl, or 50% of tetrazine for 2000-3000 times + Tianda 2116 for grain 600 times + Tianda Yufeng 1500-2000 Liquid spray, spray 2-3 times, spray once every 10-15 days. Or use 50% of procymidone 50-100g to spray 1-2 times in the end of the leaf stage to silking stage.
How to prevent pests in corn fields?
Select disease-resistant varieties, increase organic fertilizers, implement appropriate fertilization for appropriate sowing, reasonably close planting, and cultivating strong strains. Focus on the following:
(1) Chemical seed dressing, 2.5% Shilok 10g plus Tianda 2116 (for seed dressing only) 12.5g plus 50% phoxim 10ml water 100ml seeded 5kg corn seed, sowing after drying.
(2) Spray, spray for the first time at the four-leaf stage of corn, use 98% of hymexazol (5g), add Tianda 2116 (for strong seedlings), add 25g (3g) of 3% dartaacetacin cream (15ml), and mix with water (15). Kilogram spray. The second spray in the corn seven leaf stage, mu 70% mancozeb 50g plus 20% triadimefon 50ml plus 52.25% farmland 20ml plus Tianda 2116 (food only) 50g watered 30kg Evenly spray.
According to the above-mentioned measures, corn can be substantially protected from diseases and insect pests during the whole growing period, achieving high yields, good quality, and increasing production by more than 15%.
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