While these leaf blemishes may be alarming to tree owners, the bumps are only cosmetic and treatment is not needed. Galls will be a pinkish-red color and, as the season progresses, will turn light green and finally black by season’s end. Few leaves will be affected to this extent and leaf loss is inconsequential. Occasionally there may be so many galls on one leaf that the weight of the galls themselves will cause the leaf to fall from the tree. Maple bladder gall mites live, eat and mate inside the galls and are well-protected from any application of a miticide.Īre the mites harmful to the tree? Most assuredly they are not. The galls themselves are made up of plant tissue and are a part of the leaf. Whatever they are called, maple bladder galls are caused by a very tiny mite. Tree owners will call them “freckles”, “measles” and sometimes even “zits”. If you have a sliver or red maple tree, you’ve most likely noticed small raised bumps on the leaves.
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