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Gall in Maple Trees
These are maple bladder galls. The silver or soft maple trees are often attacked by tiny mites that cause small, wart-like growths on the foliage. These growths are first red, then turn green and finally they turn black.

They occur alone or in clusters and may be so abundant that the leaves become crinkled, deformed and drop early. Once formed, the galls cannot be removed from the leaves because they are composed of plant tissue and are actually part of the leaf.

Many homeowners become alarmed when they discover infestations of the maple bladder gall, fearing that their trees might die unless control measures are taken, this is not likely. The galls never cause permanent injury and have little effect on tree health and vigor. The galls do, however, detract from the normal beauty of the foliage.

Rake leaves from the base of tree in the fall and bag the leaves.
Maple Trees with Gall
Maple Trees with Gall
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