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Corn seedling blight generally refers to corn seedling blight, with the long time of heavy stubble planting corn, some plots appear, corn seedling blight occurs. Corn seedling blight will cause the appearance of corn seedling shortage and broken ridges, which will affect the uniformity of corn field, and the corn with less damage will become weak seedlings, which will have a serious impact on the yield of corn.
1, the harmful symptoms of corn seedling blight, corn seedling blight mainly occurs in the summer corn planting area, from the germination of corn seeds to the 3 leaf stage can be diseased, the first manifestation of the upper leaves of corn seedlings yellowing, leaf edges and leaf tips are dry, and there is a bottom leaf upward gradually spread, resulting in heart leaf curling, the lighter one becomes a weak seedling, the disease is serious, the peripheral leaves are dry, and the heart leaf wilt plant dies. Some corn seedlings are diseased, the root system is underdeveloped, there is no secondary root, the root tip of the seed root becomes brown and rotten, and gradually spreads upward, when the humidity is small, the stem base is water-stained and rots into brown, and there is mildew when the humidity is large.
2. The main reasons for the occurrence of corn blight are: soil reasons, corn stubble planting time is too long, and more pathogenic bacteria have accumulated in the soil, which will harm corn seedlings at the right time. In particular, the incidence is more severe in poor soils, low-lying terrain, saline-alkali soils and clay soils with poor air permeability. The resistance of maize varieties is poor, and some maize varieties introduced from other places are not suitable for the local climate, resulting in weak growth potential of maize seedlings and more susceptible to blight disease. Some maize varieties have strong resistance to maize diseases in the later stage, but weak resistance to maize seedling diseases. In the climate of low temperature and high humidity, corn likes temperature and is not cold-tolerant, and after corn sowing, it is easy to cause the occurrence of corn seedling blight when encountering continuous low temperature and rainy weather.
3. Prevention and control methods of corn seedling blight: (1) Corn seedling blight needs to strengthen field management, and avoid root burning caused by partial application of nitrogen fertilizer through reasonable fertilization. When sowing corn, when using seed fertilizer, it is necessary to sow seeds and fertilizer separately, and the seeds and fertilizer should be spaced about 10 cm apart, so that they cannot be in direct contact. Phosphorus fertilizer should be added to the base fertilizer to promote the growth and development of the root system.
2) Seed dressing, the use of seed coating agent before the sowing of corn seeds is an effective method to effectively prevent corn seedling blight. Corn seed coating has a variety of different agent composition, mainly divided into insecticide seed coating, insecticide seed coating, containing a variety of trace elements of seed coating, containing plant growth regulators, containing compound fertilizers, and voles and more selected rodenticide seed coating, according to the actual situation to choose. To prevent and control corn seedling blight, choose a seed coating agent containing fungicides. For example, 03% carbendazim wettable powder can be dressed, or you can choose seed coating containing fungicides such as fludioxonil, methacryl, tebuconazole, difenoconazole and other fungicides.
3) Spraying pesticides at the seedling stage, for the diseased plots, you can use 1000 times of 20% ** ketone solution, or 600 times of 50% mildew and mildew can be wetted powder. It is also possible to use 500 times of methyl tobuzine + 1500 times of benzconazole suspension to spray or water the agent in the early stage of the disease. Jinggangmycin also has a certain control effect on corn seedling blight. To learn more corn high-yield cultivation techniques, it is recommended to click on the relevant column to continue reading and learning. Well, that's all for the sharing of this chapter, welcome to follow, like it and then go.
The author Mu Yu listens to the wind, has many years of technical experience in agricultural production, and has accumulated rich experience in how to achieve high quality and high yield in planting crops, if you have related questions, please feel free to consult me, click on the card below to ask me questions.