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淡黄的白色斑点略微升高，并逐渐扩展到淡黄棕色斑点，最终变成红棕色，叶子似乎被燃烧。 Finally, the leaves are dry, function is lost, and the plants are aging and die. The pathogens are Basidiomycetes and Monocytic Rust. The source of infection is the diseased body of beans planted in spring or the pile of summer spores left in the fields.夏季孢子发芽以产生芽管，并通过气孔侵入宿主。当空气湿度高或雾很重时，主表面上有一个水膜，夏季孢子最有可能发芽和侵袭。 The diseased strain spreads summer spores through airflow, insects, humans and animals, causing frequent reinfection. The pile of wool spores produced became the initial source of infection for the legume crops planted in the spring of the following year.