Corn smut, farmers call it "gray bag." It can occur in every growth period of corn, damage tassels, male and female, and stems and leaves. Symptoms The symptoms before and after corn tassel identification become apparent. The affected area grew tumors of different sizes. The tumor was white or red-purple at the beginning of the tumor and turned gray afterwards. After the rupture, the black powder was scattered. The diseased male flowers and glumes often grow into leaves. The disease differs from the symptoms of head smut in that the head smut only attacks the ear, but does not have a long-standing tumor, and has filaments like hair filaments; whereas smut can damage various parts of the corn plant. It also produces tumors with no residual filaments.
Prevention
1, choose resistant varieties. The selection of disease-resistant varieties is the most cost-effective method of prevention and control. The main disease-resistant varieties currently promoted include: Nongda 60, Xingkang 2, etc.
2, remove the source of the disease. The disease was found and removed early, concentrated or burned. After harvesting, the leaves of field stubs are completely removed, reducing the source of overwintering bacteria in the soil. Heavy-field disease should try to avoid continuous cropping.
3, seed dressing prevention. For each kilogram of seed, use 25% triadimefon 200 g; or use 50% carbendazim powder 0.25 kg. When dressing, wet the seeds with a wet towel and mix the herbs. Mix after sowing.
4, pay attention to agricultural operations, reduce the wound. Timely prevention of corn borer and other pests. Try to avoid damaging the plants when operating in the field.
5, timely removal of diseased plants. The disease symptoms of this disease are often not obvious. It requires careful observation to discover. The earliest disease that usually appears in the field is the stalk base of the plant when the seedlings are 3-5 leaves. At this time, the plant height of the corn is 30 cm. The symptoms of the seedling stage include stem and leaf distortion, dwarfing, leaf sheath, and rupture of the heart leaf. After being uprooted, a diseased tumor at the base of the stem or at the root of the stem was observed. In severe cases, the diseased plant died. Should be timely combination of seedlings, Dingmiao, cultivator, weeding, completely remove the seedlings suspicious seedlings.
6, after the jointing of the main tumor. After jointing, the symptoms became more pronounced with the increase of leaf age. It is necessary to remove the tumor in time.
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