Vegetable pathogenic diseases include fungal diseases, viral diseases, 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 pathogenic diseases and deficiency traits are very similar in appearance, especially in the early stage of disease, which brings certain difficulties to disease prevention and control. In this case, the distinction can be made from the following three aspects.
See the relationship between illness and soil
Vegetable pathogenic diseases are not particularly related to soil types and characteristics. No matter what kind of soil type, if any pathogens, can occur in the case 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, if the soil pH in the north is high, it is not easy to lack molybdenum, while in southern acid soils, molybdenum is easy to be lacking, and molybdenum-deficient plants show poor growth, short stature, whip-tailed leaves, cup-shaped leaves or yellow-leafed leaves. For some nutrient-rich soils, some or some deficiency syndromes may occur, but infertile soils occur frequently.
See the process of development of illness
Vegetable pathogenic diseases are contagious, generally have obvious disease centers, and then quickly spread to the surrounding, usually in pieces. If they are not controlled in time, they can cause great harm 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 weather
Vegetable pathogenic diseases generally occur frequently on cloudy days and high humidity weather or re-emergence, and plant groups are more prone to occur when they are sheltered. Should pay attention to observe the weather and the growing condition of the plant population, early prevention and treatment. The lack of disease has little to do with air humidity. However, long-term accumulation of water or drought in the soil can promote the occurrence of certain deficiency diseases. Such as long-term accumulation of water can lead to plant potassium deficiency, the performance of the leaves from the bottom to the edge of the leaves scorch, like the fire. The soil moisture content is unstable and fluctuating. It is prone to cause calcium deficiency, resulting in physiological diseases such as umbilical rot, heart rot, pseudo-black spot disease, and celery stem disease. It also affects fruits and vegetables in varying degrees. Flower bud differentiation.
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