How to identify citrus red coat disease?

Red coat disease is distributed in Zhejiang, Jiangxi, Taiwan Province, Sichuan, Guangxi, Guizhou, Guangdong, Yunnan and other provinces (autonomous regions). It mainly harms branches, leaves and fruits. When citrus branches are damaged, sometimes resin will be secreted, and when it dries, it will crack. White (or reddish) hyphae are produced in the affected area, and then smooth films are grown, which are tightly attached to the shady side of the branches, and the colors are bright after the rain. The mycelium is dark brown after aging and can be torn into strips. Sometimes hyphae can be seen spreading between branches and covering leaves and fruits. The mycelium will cover the front and back of the leaves, causing the leaves to wither. When the mycelium wraps the fruit, the fruit stops developing and becomes stiff and hangs on the treetops. Citrus trees infected with red skin disease will cause defoliation, fruit drop and dry branches, which will affect growth and reduce yield, and even the whole plant will die.