Phyllostictina leaf spot

The pathogen is Phyllostictina citracarPa, at first glance, its symptoms are like mosaic caused by virus, but careful examination can find that there are black spots all over the disease department. These are the fruiting bodies of pathogenic fungi. If you do not have much control over the pathogen, you can wipe the disease part of the leaves with a wet cloth, and the spores of the fungi will be released, showing a good-looking powder in dark color. (Liu Zhongjian)