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Pathogenic classification of parasitic diseases in plant.

Ruanpanun Zhang

Infection of plants occurs when spores of the pathogen fall on susceptible host leaves or stems and germinate, each spore producing a germ tube. Tubes grow on the surface of the host until an opening is found. The tube then penetrates the host, spreading branches between the host's cells and forming a hypha within the penetrated tissue. The germ tube of some fungi produces a special compression organ called the aspersorium, from which microscopic needle-like pins compress and pierce the epidermis of the host. After invasion, the mycelium develops in the usual way.