First, see the process of development of illness
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.
Second, 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, the high soil pH in the north is not easy to lack molybdenum, while the acidic soil in the south is easy to lack such elements. The plants are characterized by poor growth, short stature, whip-tailed leaves, cup-shaped leaves or yellow-leafed leaves. For some soils with different nutrient levels, some or some of the deficiency diseases can occur, while infertile soils occur frequently.
Third, see the relationship between illness and weather
Vegetable diseases generally occur frequently on cloudy days and in high humidity weather or re-emerged, and it is more likely to occur when plant groups are covered by dew. 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 the above-ground air humidity. However, long-term water retention or drought in the soil can contribute to some of the deficiency. For example, long-term water retention in plants can lead to potassium deficiency, which is characterized by leaf scorch from bottom to top, like a fire pot. 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.
YT-H706
YT-H706
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