How to Control Maize smut caused by smut

Corn smut, commonly known as Wumi, is the main disease of corn. The disease is a budding invasive and systematic infectious disease. The pathogen invades the maize bud, then extends to the seedling growth point, and extends to the whole plant with the growth of the maize plant. Generally, it shows typical symptoms at the ear stage, mainly harming the female and male ears of corn. Once the disease occurs, it often can not bear fruit.

Maize smut

The symptoms of seriously damaged maize at seedling stage were as follows: more tillers, clustered type, obvious dwarfing of plants, shortening of internodes, dark green and straight leaves, chlorotic yellow-white stripes parallel to leaf veins in some varieties, and heart leaves of some maize seedlings tightly coiled together. twisted like a whip. The diseased ear of corn at adult stage can be divided into two types: black ear type: the damaged ear is short, the base is thick, the tip is pointed, and there is no filament. Except for bracts, the whole ear becomes black powder bag, which is mixed with filamentous host vascular bundle tissue. Abnormal type: the male spike floral organ is deformed, does not form stamens, the glume is leafy, and the female spike glume may overgrow into tubular long thorns, showing a "hedgehog head" shape, and the whole ear is deformed. Most of the diseased plants of maize in the field were damaged by both female and male ears.

Prevention and cure method

1. Disease-resistant maize varieties were selected.

two。 Adjust sowing time and improve sowing quality. Appropriate postponement of sowing date, seed selection and drying before sowing to improve the germination potential of maize seeds. Promote fast emergence and strong seedlings, reduce the chance of pathogens infecting maize buds, and improve the disease resistance of corn.

3. Cover with plastic film. Plastic film mulching can increase soil temperature, maintain soil moisture, speed up the emergence and growth process of maize, and reduce the chance of disease.

4. Remove diseased plants, remove diseased tumors, and reduce the source of bacteria.

5. Chemical control. Corn seeds are treated with chemicals before sowing, and the most commonly used treatment is seed dressing, which can be treated with 15% triadimefon wettable powder or 50% thiophanate-methyl wettable powder according to 0.3%-0.5% of seed weight. The seed can also be mixed with 12.5% diniconazole wettable powder or 2% tebuconazole seed mixture according to 0.2% of the seed weight.