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Does anyone know what this is on the leaves of my Witch Hazel? Should I be concerned? Favorit tree in my whole yard - I don't want to lose it!
Thanks,
NorfolkLiz
It looks to me like it's galls. There's an aphid that causes galls on witch hazel--here's a little info (scroll down to the bottom of the page for witch hazel) http://www.ca.uky.edu/entomology/entfacts/ef403.asp I'm not super familiar with this particular type of gall, but most galls don't do much harm to the plant.