Why can the same disease show different symptoms?

The cause of the disease varies and the location of the disease is different.

In the process of cultivation, medicinal plants are affected by pest infestation or adverse environmental conditions, and the normal metabolism is disturbed, from physiological functions to tissue structure.

A series of changes and destruction occur, so that abnormal lesions appear in the external morphology, such as wilting, rotting, spots, mildew powder, flowers and leaves, etc., collectively referred to as diseases.

The causes of the pathogenesis of medicinal plants include biotic and abiotic factors. by biological factors such as fungi.

Diseases caused by bacteria, viruses and other invasion of plant bodies are infectious, called infectious diseases or parasitic diseases, and diseases caused by abiotic factors such as drought, waterlogging, severe cold, nutrient imbalance, etc., which affect or damage physiological functions, are not infectious, and are called non-infectious diseases or physiological diseases.

In infectious diseases, the pathogenic parasites are called pathogenic organisms, among which fungi and bacteria are often called pathogenic bacteria. The infected plant is called the host plant. The occurrence of infectious diseases not only depends on the role of pathogenic organisms, but also is closely related to the physiological state of the host and the external environmental conditions, which is the result of the interaction between pathogenic organisms, host plants and environmental conditions.

LS 2b- - for the hair will come out of Panax notoginseng powder?

Because the same disease occurs in different parts of the host, different growth periods, different stages of disease and different environmental conditions, it can show different symptoms, that is, the same disease and different diseases. (This is called leveling).

Discoloration, necrosis, decay, wilting, deformity, complications, syndromes, and so on...

Good evening! The reference is rice sheath blight.

The treatment of pathogens in the field was not thorough. In the investigation, it was found that due to the continuous cropping of rice, although most of the rice straw was removed from the field, it was not completely removed, and the diseased rice straw was directly left in the field without sterilization and decay, resulting in the accumulation of bacteria and aggravation of the disease.

It is difficult to rotate crop and stubble, after the paddy field is converted to dry field, it is difficult to cultivate and prepare the land, the yield of dry crops is not high, and the benefits are not good, so the rice farmers are unwilling to rotate, resulting in continuous cropping of rice, thus causing the amount of pathogenic bacteria in the soil to accumulate year by year, accumulating more and more, and the harm is aggravated.

For the teacher's reference only.

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Diseases are divided into infectious and non-infectious diseases (physiological, natural damage), i.e., damage.

From the first element: the disease is caused by the first child, the injury is not, it can be caused by animal and plant injuries, or natural injuries and other factors.

From the onset of symptoms: the disease depends on the fungus, the bacterial infection, there are different secretions, and the color of the symptoms, such as the bacteria are pus.

From the distribution of the disease: the damage may be local, with obvious non-spreading, but the invasion of germs has obvious spreading, and generally occurs in large areas.

Pests: As the name suggests, it is caused by insect damage, and the first cause is different.

Secondly, the symptoms are different, insect pests generally have gnawing, flowers and leaves, yellowing, leaf rolling, root breakage and other phenomena in all parts of the plant. . . Diseases are generally different, and the most striking feature is that the disease secretions are obvious.

The names of some diseases of bacteria, fungi and viruses are derived from the characteristics of the disease, such as grape powdery mildew, the symptom is that there is "white powder" in the disease, root rot is obviously the symptom of root rot, and rice black streak dwarf disease is the appearance of black stripes on rice leaves and the dwarf of rice plants, which are all named after the characteristics of the disease.

Another point: it is to judge what the disease is according to the characteristics of some of the affected diseases, which is also an important basis for many agricultural experts to determine the disease.

Consider zinc deficiency.

The pathogen of zinc deficiency in cucumber:

In addition to soil zinc deficiency, the cause of zinc deficiency in the soil is too high soil phosphorus, and cucumbers are prone to zinc deficiency symptoms when the soil available phosphorus content is too high. In addition, the pH of the soil is high, even if there is enough zinc in the soil, but it is insoluble, and the root system cannot absorb and utilize, which will cause zinc deficiency. Excessive light exposure can aggravate zinc deficiency in cucumbers.

For the teacher's reference only.

Potato leaf blight.

Cause of BAI pathogenesis: pathogen DU

Sclerotia or hyphae can be overwintered in soil with diseased tissues, and plates can also overwinter on the residues of other right hosts.

When the conditions are suitable in the following year, the ground pathogens are splashed on the leaves or stems through rainwater to cause initial infection, and after the onset of the disease, the diseased part produces sclerotia or conidia with the help of rainwater propagation for repeated infection, resulting in the spread of the disease.

Warm and high humidity is conducive to the occurrence and epidemic of the disease. Continuous cropping plots, low-lying terrain, excessive irrigation, poor drainage, over-dense cultivation, partial application of nitrogen fertilizer, man-made wounds or insect wounds are more severe.