There are mainly two types of pathogens in the mosaic leaf spot, one is the Cercospora fungus and the other is the Cylindrosporum fungus. The former is mainly infected with Cymbidium, Dendrobium, and Burning Blue, while the latter is limited to the earthly species of Guolan. In the early stage of Cercospora leaf spot, a round or irregular yellow zone appeared on the upper surface of the leaf, and the lower surface also had a small lesion of a corresponding color, and then turned dark brown or sometimes purple black. When severe, there is a layer of black powdered spores on the lower surface of the leaves, which is a particularly serious threat to the seedlings and can cause death. The control was sprayed with 80% zeocin and Manson (2.5 g plus 1 L water), especially the lower surface of the leaves. C. pallidus occurs mainly in the middle and lower part of the leaves of the genus Cymbidium, and quickly expands into pea-sized or slightly larger dark-brown spots, and finally becomes lighter in the center, forming tan-brown on both sides of the leaves. Protuberances (spore discs of pathogens), when severe leaves wither and die. It can be sprayed with Bordeaux mixture (1%) or 50% carbendazim 500 times. In addition, leaf spot disease is caused by infection with pathogens such as Macrophomina, Phyllosticta, Selenophoma, and Septoria, but it is rare in China.
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