According to a recent survey conducted by the city’s pest monitoring sites, corn smut occurred in some spring maize fields in the north, and the incidence of field disease was 2%–8%. Maize tassels and some of the ear were seriously affected, and most of the fungal blasts had been ruptured. Dispel black powder. Maize smut is a systemic infection that invades the seedling stage. It usually shows typical symptoms at the ear stage. It mainly damages tassels and ears of corn. Once the disease occurs, the whole plant usually has no yield. Severely affected plants may show symptoms at the seedling stage. The growth of tillers is clustered, the plants are obviously dwarfed, the internodes are shortened, and the leaf color is dark green and straight. Some varieties have yellow-white streaks parallel to veins on their leaves. The leaves of the seedlings are tightly rolled together and bent into a whip. There are two types of adult stage disease ear: (1) Black panicle type: Sensitive female ear is shorter than Jianjian, the lower part of the panicle is swollen, the top is more pointed, and many of them do not spit filaments, and all except the temporal lobe and cob are dark brown. Powder, with black filaments in the middle; (2) Abnormal metamorphosis: The flowers of the affected tassels were deformed, the inflorescences turned dark, no stamens were formed, and the glumes became longer and leafy. The disease easily occurs in cold regions. Long continuous cropping of corn, soil drought after sowing, low temperature, and slow emergence of corn are all conducive to the disease. Early prevention is the key to controlling the disease. In areas where the incidence is heavy, select disease-resistant varieties, timely pluck sowing, and reasonably rotate crops; in order to prevent spread of seeds, seed dressing should be done before sowing, and 2% tebuconazole can be used as wettable powder, or 15% Triadimefon WP can be seeded at a seed weight of 0.4%-0.6%; in the early stage of the disease, the diseased plant should be removed in time. The symptoms of seedling stage should be combined with the removal of the seedlings. After the disease, the disease should be extracted before the rupture of the end of the disease. Diseased plants, and brought to deep outside the field or burned to prevent overwintering spores increase the number of pathogenic bases in the coming year.
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Anti-corn smut in mountain areas
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