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1病害的初侵染源病原物从一个寄主到另一个寄王的一系列传播，叫做病原物的浸染链（浸染循环）。病原物从一种或一类植物上传播到同一种或同一类植物上，叫做同主浸染链（单主寄生）。寄生物在不同种的寄主上循环寄生，叫做异主侵染键（转主寄生）。侵染链可分为连续侵染链和间
A primary source of disease spread from one host to another sent to the king of a series of spread, called the disseminated chain of pathogens (dip cycle). The pathogen spreads from one or a group of plants to the same or same type of plant and is called the same dominant dip strand (sole parasitic). Parasites circulate parasites on different hosts, called heteromorphisms (transposons). Infectious chains can be divided into successive infection chains and between