On large shrubs and trees, remove basal suckers, twiggy growth, crossing branches, and branches growing toward the center of the plant. Like the algae, lichens manufacture their own food. They almost look like the aftermath of physical injury, perhaps from hail damage or an animal chewing. Okay, jumping off that soapbox, let’s talk about the Crapemyrtle Bark Scale. They are symbiotic growths of algae and funguses as they nourish one another. Spots or White Powder on Crape Myrtle Leaves? In old, overgrown landscapes, mosses and lichens are a common sight on trunks and branches of trees and shrubs. In sunny areas, algae and fungus combine to produce lichens. The crape myrtle is a popular woody ornamental plant. As a reminder, crape murder is the extreme pruning of crapemyrtles that results in weakened and deformed trees. All crepe myrtles bloom on new wood and should be pruned in winter or early spring. No problems there. Like all trees, Crape Myrtles can develop fungus or mildew on their leaves. Many leaves fall during the summer, although some are the normal green. Lichens have two components—a fungus and an alga living in association with one another to give the appearance of a single plant. The gnarly tissues are more puzzling. Asked September 5, 2016, 4:26 PM EDT. Rarely are they found in water. If you aren’t sure how to properly prune your crapemyrtles, check out this post. When to know a crape myrtle is dying. What do I … Fungus on Crape Myrtles. The gray growths are called lichens and they are harmless. At first, we thought that this was a reaction to the drought. However, the Crape Myrtle does boast a higher resistance to pests and diseases than other flowering tree varieties, and when they are affected, the issues are easy to mediate quickly. Tags: Fungus, fungi, funguses,Crape Myrtles, lichens, treatment, fertilize, fertilizer, knockout rose bush, general purpose fertilizer, rose fertilizer, tree fertilizer, spikes, lawn and garden, the southern garden ... Lichens are self-sustaining organisms that attach and grow on the bark of trees and shrubs. With crape myrtles, the life of lichens and moss is often short-lived as these trees and shrubs shed their bark to cleanse the surface. Lichens are fungal epiphytes, not parasites, meaning they get their nutrients from the air, not the tree they’re growing on. Lichens grow on soil, on trunks and branches of trees and shrubs, and on rocks. Queen's crepe myrtle, L. speciosa, grows only in the Tropical South. Despite its usual hardiness, in the spring and fall, some leaves may turn grayish white. Q: I trimmed my crepe myrtles back recently and there was a lot of mossy green ruffly stuff growing on the branches.They haven't been blooming very well either. 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