This is on one of my mother’s maples. What is it and what should she do about it?

      • LibertyLizard@slrpnk.net
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        1 year ago

        Hi, arborist here. I would advise against using pesticides to control this issue. The galls are completely harmless to the tree and the pesticides may cause harm both to you if you were accidentally exposed, and definitely to other invertebrates, many of which may be beneficial. Some may even help control the mites in future years.

        • Flying Squid@mander.xyzOP
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          1 year ago

          Thanks. I think what my mother will do is just pick off the affected leaves that are really bad and leave the rest.

          • LibertyLizard@slrpnk.net
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            1 year ago

            Great, that’s basically what I’d recommend. Disposing of any leaves you pull off the tree and those on the ground away from the tree should help reduce the intensity of the issue.