Plant disease types can be roughly divided into four categories: fungal disease, bacterial disease, viral disease, physiological disease.
The proportion of fungal diseases is the largest. The vegetative body of fungi is mainly mycelium, which grows in and out of plants. At a certain stage of growth, spores will be produced and continue to propagate. The environment of fungal diseases is mostly humid, and mildew and powder will grow in the tissue of the host. From the outside, fungal diseases are manifested in rot and discoloration, tissue necrosis, wilting deformity, decay and cataclysm.
Bacterial diseases
The proportion of plant infection with bacterial diseases is small, and most of them are acute necrosis. The external manifestations of bacterial diseases are: spots, ulcers, water stains, oil stains and bacterial pus.
Virus diseases are mainly caused by virus invasion and infection. There are many kinds of flowers and plants that are harmed by virus diseases. Virus pathogens are shown in discoloration, spots, rings and veins from the outside. Clustering, dwarfing, abnormal necrosis and other symptoms. The source of the virus is mainly through the inhalation of various insect mouthparts plant transmission.
Physiological diseases are mostly caused by poor environment, such as high temperature, low temperature, or lack of nutrition, and other external causes, which are manifested in the external performance of flowers: leaves. Falling fruit, withered branches and leaves, etc.
