Just noticed a shiny, white, sticky substance on some leaves. Photos show several leaves with more substantial damage. What is it? How to treat? Any help/ideas would be appreciated. Thank you!
problems with River Birch trees
Yes, read all about it here - Spiny Witchhazel Gall also called the River birch Aphid.
http://bygl.osu.edu/bygl_archive2015/content/spiny-witchhazel-gall-aphid-0
Try getting some ladybugs or lacewings, something that likes to eat aphids.
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