(游动孢子) (孢子) sporangium sporulation t young 春季幼苗上 germ tube (卵孢子) 孢子形成) oospore (叶片上孢子形成) tion on leat 88期 sexual reproduction only when boti 只在间件之配量都存在时发 o股的 This is a simplified disease cycle for late blight of potato. (这是简化的晚疫病病害周期)