When the appearance of crops is abnormal, many farmers think that a disease has occurred and consider how to choose pesticides for prevention and control. In fact, sometimes the abnormal symptoms of many crops, including vegetables, are caused by over-fertilization or unbalanced fertilization.
1. Rape uses less boron fertilizer and often "flowers but not solid": In the rape production, the phenomenon of "flowers but not solid" often occurs, that is, only the flowers do not see fruit, and the yield is severely reduced. Generally speaking, this is not a disease caused by pathogenic bacteria, but neglect of plant physiological obstacles caused by the application of boron fertilizer. During the blooming and podging period of rapeseed, if it encounters continuous rainy weather, the rapeseed with partial nitrogen fertilizer will grow vigorously and the field shade will be larger, which will often induce more serious sclerotinia disease. No disease or mild disease.
2. Insufficient micronutrient fertilizers in vegetables and deformed leaves and fruits: mosaics, dwarfing, arbuscules, and threaded leaves appear in many vegetables at the seedling stage, which are generally diseases caused by viruses, but adequate zinc fertilizer is applied to the base fertilizer or timely Zinc fertilizer will reduce or prevent this abnormal growth. Tomatoes and peppers have umbilical rot, Chinese cabbage and cabbage have heart rot, cauliflower leaves turn yellow and brown and die, and celery core leaves yellow and scorch. The common cause is the lack of calcium in the soil, which induces the above-mentioned physiological diseases. Usually it has nothing to do with the invasion of pathogenic bacteria, but vegetables lacking calcium and sulfur may provide conditions for bacterial diseases to take advantage of the weakness. In addition, changes in temperature and moisture factors may also trigger the occurrence of physiological diseases of vegetable crops. For example, when tomatoes enter the "pull cross" period, when the average temperature is lower than 15°C, the fruit may be deformed, and yield and quality will be affected. Another example is that during high temperature and drought, tomato may have bud blight, which can be alleviated by timely irrigation and cooling, without the need to apply pesticides.
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