1. Non-invasive diseases: Caused by unfavorable environmental conditions, there are many environmental factors such as temperature, moisture, light, oxygen, and malnutrition of nutrients. 2. Infectious diseases: The plant diseases caused by biological infestation should be diagnosed from the following three aspects: host plant and diseased plant's environmental conditions and pathogens: (1) Fungi are mainly classified according to the morphology, usually in the diseased tissue. Propagation of fungi on the surface, such as conidia (black spots seen by the naked eye), can be recovered from the diseased tissue and incubated in the laboratory or isolated and cultured to obtain pure culture and identification. (2) The simple identification method for plant bacterial diseases is to observe the diseased leaves by light, whether the edges of the lesions are oily or transparent, and cut small pieces of diseased tissue to observe under low magnification microscope, if there are a large number of bacteria from the tissues. The spilled part of the victim can be initially identified as a bacterial disease. (3) Plant virus disease is mainly based on the chlorosis, malformation, and other special symptoms that appear after the onset of the plant. At the same time, the victim site does not form fruit bodies, bacteria spills are not seen, and no fungi or bacteria can be isolated. The initial diagnosis can be made. (4) Nematode diseases and diseases caused by parasitic seed plants can be detected on the affected tissues by pathogenic nematodes or parasitic seed plants.
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