Inquiries: Experts Hello, how does corn black powder fight?
Answer: There are two types of corn smut, head smut and tumor smut.
First, the symptoms: 1. Tumor smut can occur in various stages of corn growth, the tumor is white at first, gradually gray, white inside. With the increase in the number of tumors, the tumors became soft and hard, the color changed from shallow to dark, and finally the epidermis ruptured and a large amount of black powdered teliospores were released. 2. Head smut only infects ears and filaments. The ear of the affected fruit was shortened, and the base was thick and the tip was pointed. The inside of the loquat leaves was peeled off into a pack of black powder. After the tassel was victimized, the whole floret turned into a black powder packet, and a large amount of black powder was scattered after the tasselling.
Second, prevention and control methods: 1. Selection of disease-resistant varieties. 2. Reduce the initial infestation source and completely remove the diseased body. Tumor smut should be promptly removed before the tumor grows, and brought to the field for destruction. The use of straw as fertilizer must be fully decomposed. Severe disease fields should be implemented for two to three years of rotation. 3. Strengthen field management. The fertilization of corn should pay attention to the balanced use of organic fertilizer and inorganic fertilizer. Topdressing should be reasonably matched with N, P, and K to avoid partial application of nitrogen fertilizer to cause bribery. Appropriate use of zinc-containing and boron-containing microelement-free fertilizers has a clear control over diseases. 4. Chemical control. Head smut is a seed carrier, and seed dressing is used. The control effect is very good. Seed weight 0.2-0.3 ‰ of triadimefon or 8% of ketene seed dressing seed dressing, the control effect of up to 93%. Cornoma smut should be sprayed with 15% triadimefon 1000 to 1500 times, 7.5% loquat WP 2000 to 3000 times, or 0.5 torr copper sulphate spray before or at the onset of disease. Have a good control effect.
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