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Corn smut
1. Symptoms: mainly in corn stem, ear, male inflorescence, leaves and
There are tumors of different sizes on the grain. Cracked, shed a large amount of dark brown powder (Bacterial chlamydospore). After the ear is infested, the grain is not full, and even the entire ear becomes a melanoma and no heading. When the leaves and stalks are damaged, rice or bean-sized nodules are formed, causing the diseased plants to produce dwarfism.
2, the cause of the disease: this pathogen to crust spores in soil, soil surface and
Overwintering on diseased stalks becomes the primary source of infection for the onset of corn in the following year. The pathogenic spores spread by wind and fall on corn plant parts. In general, the incidence of high-temperature, high-humidity, heavy sorghum, corn borer damage and corn plant damage is higher.
3, control methods: 1 selection of varieties with strong disease resistance; 2 in corn plants
Remove the diseased plants as soon as possible before the tumors have matured, remove them to the outside of the field; 3 implement a rotation system for more than three years to reduce the chance of pathogenic infection; 4 use fermented and decomposed organic fertilizers; 5 10 days before corn picking About 50% of Fairchild's WP can be sprayed with 500-800 times of liquid to reduce reinfection of smut. It can also be sprayed with 1% Bordeaux mixture, which can play a protective role.
Corn smut disease prevention and control technology
Corn smut, commonly known as melanoma. The occurrence of very common and very serious diseases on corn, the general incidence rate is about 50%, and the incidence of severe land can be as high as more than 60%.