Avoid corn black spikes from scratching

Corn smut and corn schistosomiasis can cause corn ears to darken. The head smut of corn is mainly characterized by symptoms in the ears of corn. In addition to obvious symptoms in the ears, smuts of corn smut also present melanoma in the rest of the body. However, the characteristics of these two diseases are similar, and the methods for prevention and control are similar. All of them need to be strengthened from the beginning of sowing.

Corn head smut is a systemic disease caused by fungi, and the pathogen is silkworm smut. Contaminated mainly with soil, manure, seeds, etc., the chlamydospores on diseased soils in soil are the main origin of infection, and spores adhered to seeds can also be transmitted. When the seeds germinate, the germs also germinate and infect the seedlings (the pathogens invade more before the 5th leaf stage of maize), and typical symptoms emerge at the ear stage. Occurrence of tassel, part or all of the flower deformation, filled with black powder. The incidence of ear, in addition to loquat leaves, the whole was damaged by the bacteria, the appearance of Jianjian, all internal black powder. Black powder is outdated, leaving only the host vascular bundle. Prevention methods are as follows:

1. Rotation of severe disease areas can be selected to rotate crops such as soybeans, vegetables, and potatoes to reduce the accumulation of pathogens in soil. The rotation period is 3 years, and it cannot be done with Gao Hao.

2. Selection of Disease-Resistant Varieties Suyu 18, Suyu 19, and Suyu 20, as well as the Shandan series, Nongda series and Zhongdan series, have a high resistance to disease. Both are strong.

3. Seed Solving This is the key to preventing and controlling corn head smut. It is best to use coated seeds and to use seed dressing. For seed dressing, seeds are sowed before being sowed, placed in a container, added with 1% water, and the seeds are wetted. Afterwards, 12.5% ​​of diniconazole (Tropizol) powder with 0.1-0.2% of seed weight is evenly distributed. Stir the seeds and dry them to dry. Mix the drug must be uniform. Applicable pharmaceuticals include: Triadimefon with a seed weight of 0.4% (25% of active ingredient); Carbendazim and Veratryingen (0.5% active ingredient) with a seed weight of 0.5-0.7%; 12.5% ​​of seed weight 0.3-0.5% Speed ​​Poly WP, 50% thiophanate-methyl wettable powder.

4, remove diseased plants and early removal of field bamboo shoots, dwarf clumps, leaves on the leaves and stems and leaves abnormalities, deformed plants, brought out of the field to focus on deep buried or destroyed, can not be easily thrown away, do not feed livestock . Straw manure must be fermented to kill germs.

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