Also known as Green scurf, the Algal leaf spot disease is caused by a parasitic algae called Cephaleuros Virescens. Its spores, which are spread by rain, create a big problem for more than 200 plant species, especially plants growing in warm, humid climates. They are marked by rough, net-like orange, brown, gray, or green blotches on the leaves. Although the disease affects primarily foliage, it sometimes impacts branches and twigs, causing a stunted appearance with reddish-brown or pale green lesions.

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Source: Gardening Know How