In the field of crop production in Daejeon, when the appearance of the crop is abnormal, many farmers think that the crop is a disease, consider how to choose pesticides for prevention and control. However, the abnormal symptoms of many crops are not caused by diseases, but caused by excessive fertilization or improper balanced fertilization.
In the rapeseed production, there are often flowers and intangible phenomena, that is, only see the flowering is not solid, serious reduction in production, this is not a disease caused by pathogens, but ignore the application of boron fertilizer, lack of physiological factors caused by boron. During the period of flowering and scabbing of rapeseed, in the event of a rainy weather in which rapes are exposed to nitrogenous fertilizers, rapeseeds growing under nitrogenous conditions tend to grow thicker in the fields and often cause more severe sclerotial sclerotia, and rapes with reasonable fertilization, good ventilation and light transmission, It is not disease or mild disease.
In the production of vegetables, many vegetables appear mosaic, dwarf, twigs, and lines, which are generally diseases caused by viruses. However, applying enough zinc fertilizer or applying zinc fertilizer in time in basal fertilizer will reduce or This abnormal growth does not occur. When umbilical rot occurs in tomatoes and peppers, heart rot occurs in cabbages and cabbages, and the edges of cauliflower leaves turn yellow and brown to death, and the leaves of celery leaves yellow, the common cause is the lack of calcium-induced physiological diseases. The invasion of pathogenic bacteria is irrelevant, but vegetables that lack calcium and sulfur deficiency may provide conditions for bacterial diseases. In addition, the changes in temperature and moisture factors may also cause the occurrence of physiological diseases in vegetable crops. For example, when tomato enters the “cross-border†period, when the average temperature is lower than 15°C, the fruit may be deformed, and the yield and quality will be affected. Another example is high temperature, drought, tomato bud blight may occur, as long as the timely irrigation and cooling can be alleviated without the use of pesticides to prevent disease.
Therefore, when encountering crop diseases in agricultural production, it is necessary to make investigations and studies in advance, scientifically and accurately identify crop diseases, and belong to the diseases caused by pathogenic bacteria. Therefore, different pesticides should be used to prevent and treat diseases. If the physiological disease caused by non-pathogenic bacteria, the response to disease to improve the ecological environment, do a good job formula fertilization, balanced fertilization.
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