Corn cultivation is common in China, so is it possible for every grower to grow high-yield corn? This small series is hard to say. After all, corn planting still needs skill, otherwise how to prevent pests and diseases. The following small series will talk to you about the field management techniques and pest control methods for corn high-yield planting. 1 Major diseases and control measures in corn fields 1.1 Introduction to corn spot disease Corn spot disease is one of the most common corn diseases in the Mishan area. Once the disease is infected, it will be difficult to contain in large areas, and it will occur almost every year. It will generally reduce the local production by 20%~55%. From the perspective of pathological properties, large spot disease is a worldwide fungal disease, which occurs not only in the northeast region, but also in hot and humid regions such as the south. In terms of scientific name, big spot disease is what people often call "loose leaf disease". It occurs on the eve of corn jointing, mainly from the last disease of the old leaves to the position of the new leaf heart, and finally to the whole plant. The infection rate of large spot disease is extremely high. Once a corn plant in the field is infected, the virus infection will form a leaf lesion, and finally the whole plant will die, and the corn yield will be seriously reduced. In the northeast, July-August is a concentrated rainfall period, which is also the fastest growing season for local corn. Due to the high temperature in the field, if there is continuous rainy weather, it will cause the air humidity to increase, which will create conditions for the spread of pathogens. At this time, the pathogens in the corn field are the most serious. At this time, if a large amount of nitrogen fertilizer or other organic fertilizer is applied to the corn field, the occurrence and spread of the corn leaf spot will be aggravated. 1.2 Effective control measures for corn spot disease The effective control measures against corn big spot disease are mainly based on agricultural control. The large spot resistance varieties such as Jingzao 1 can be selected to keep the plant spacing reasonable (50~60cm), and then try to reduce the humidity of the corn growing area. The diseased straw should be treated in time and all kinds of pathogens that may cause the onset of corn should be removed. The method for inhibiting corn pathogens can be used for large-area spray control by using 90%~95% concentration of Mn-Mn WP wettable grading with fungal bactericide, and then rational fertilization in corn field to ensure nitrogen fertilizer and organic fertilizer in corn field. Control in the appropriate scale range (1:3), and finally do the cultivating and weeding work in the corn field. In addition, it is also feasible to use the following chemical control, for example, a sputum emulsion with a dilution concentration of 500 to 800 times, and a 50% concentration of a bacteriostatic WP, which is guaranteed to be sprayed once every 5 to 9 days. In addition to large spot disease, it is necessary to take precautions against diseases such as viral diseases and sheath blight in corn fields. 2 Main pests and control measures in corn fields Insect pests in corn fields are also very common, such as corn borer, corn underground pests, corn armyworms, etc. Here, the corn borer and its control methods are mainly introduced. 2.1 Introduction to corn borer pests and diseases Corn borer belongs to the main pest of corn in Northeast China. It is a lepidopteran insect. For example, the famous corn borer in the Mishan area is quite harmful to local corn. This corn mash will feed fresh and tender corn granules directly on the corn cob and cause obvious mildew on the wound surface. Over time, it will affect the healthy growth of other healthy corn plants, resulting in rapid reduction of corn yield. In addition, corn borer also directly feeds on corn plants, which causes the corn plants to become slender and fragile, and it is easy to die directly due to external environmental influences or human touch. The leaves of corn plants that are eaten by corn borer lose their photosynthesis function, which in the long run causes the corn plants to wither. The stalk part of the corn plant also loses its water transport capacity due to corn foraging, which eventually causes the whole plant to lose water and die. 2.2 Effective control measures for corn borers The effective control measures against corn aphids are mainly based on biological control methods. For example, Trichogramma can be placed in the field and bee spots are fixed. In addition, the corn borer can be thoroughly eliminated and removed in the winter in the Mishan area. The specific method is to apply 50% concentrated octyl sulfate oil to the corn field to ensure that the application amount reaches 2kg/hm2, and then mix fine sand or fine. The soil is at least 300kg or more. It is ploughed before winter, applied on the ridge side, and then covered with soil to reduce the breeding possibility of corn borer in winter. In the second year of spring, the number of corn borer can be effectively reduced, and the pest damage can be reduced. The normal planting effects of field corn in the coming year. In the northeast, bird killing of field pests is also one of the prevention methods that can be used during corn planting. It can alleviate the pest damage of underground pests and protect the healthy growth of corn plants. Corn pests and diseases are one of the most important factors affecting the northeastern region of China. It is necessary to adapt to the specific natural conditions of the northeastern region, and do a targeted prevention and control strategy to ensure that corn in the northeast is always in a high-yield and high-yield state. Corn is the main food crop in China. It can be used for oil extraction, feed or processing into agricultural and sideline products. It has a wide range of uses and great prospects for planting. The above is a high-yield planting method for corn. An insulin injection pen is a medical device used to administer insulin
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