The performance of physiological diseases in the field has two typical characteristics: First, large areas occur at the same time, and the whole plant exhibits the same symptoms. For example, the whole field shows yellow leaves, and it is not possible to be dotted. Here one is there. Second, there is no disease center, there will be no gradual infection, and you can recover when the environment changes.
According to these two points, it is possible to judge invasive diseases and physiological diseases. In general, when there is a large area of ​​spot, deformity, wilting, yellowing, etc. in the field, it is mostly caused by improper use of pesticides , chemical fertilizers or drastic changes in the environment.
In the field, invasive diseases are still highly correlated with physiological diseases. Physiological diseases reduce the resistance of plants to pathogenic bacteria and their adaptability to the environment. It is like opening the door for pathogen infection. If the root system is injured due to improper operation, excessive watering, excessive top dressing, etc., it is easy to cause The roots are infected by pathogenic bacteria, and the roots are not easy to cause the stems and leaves to become yellow and weak, which is also beneficial to pathogen infection. In other words, physiological diseases are the cause of many outbreaks of infectious diseases. Therefore, correct judgment of physiological diseases, cultivation of robust plants, and enhancement of plant resilience are of great significance in controlling the occurrence of invasive diseases.
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