Vegetable diseases mainly include fungi, viruses and bacterial diseases. Deficiency disease, also known as physiological disease, is the specific symptom that vegetable crops lack certain nutrients. In general, the two differ greatly in appearance. However, sometimes the disease and deficiency traits are very similar in appearance, especially in the early stage of disease, which brings certain difficulties in disease prevention and control. In this case, the following three aspects can be comprehensively considered for identification.
See the process of developing the disease. Vegetable diseases are contagious. Therefore, the occurrence of disease generally has a clear center of disease, and then quickly spread to the surrounding, usually into a film, if not timely control, can cause great damage to the growth of vegetables. The lack of disease is generally not the center of disease, to disseminate as much, if you do not take remedial measures, will seriously affect the yield and quality.
See the relationship between illness and soil. Vegetable diseases are not particularly related to soil types and characteristics. No matter what kind of soil type, if there is a source of disease, it can occur in the field of high nitrogen fertilizer application without paying attention to the combination of phosphorus and potassium fertilizers. The occurrence of crop deficiencies is closely related to soil types and characteristics. For example, in the north, the pH of the soil is high, and it is not easy to lack molybdenum. However, the acid soils in the south tend to lack such elements. For some nutrient-rich soils, some or some deficiency syndromes may occur, but infertile soils occur frequently.
Seeing the relationship between illness and weather Vegetable diseases generally occur frequently on cloudy days and in humid weather, and it is more likely to occur when plant groups are covered with dehiscence. Attention should be paid to observing the weather and the condition of the plant population and early prevention and treatment. The lack of disease has little to do with the air humidity above the ground, but the long-term water retention or drought can cause some of the deficiency. For example, long-term retention of water in plants can lead to potassium deficiency, which is characterized by leaf scorch from bottom to top, like fireballs. Unstable soil moisture, high and low, easily lead to calcium deficiency, leading to physiological diseases such as umbilical rot, heart rot, pseudo-black spot disease, celery stalk disease, but also affect the flower buds of fruits and vegetables in varying degrees. Differentiation.
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