Mother Nature’s Moment - July 2021
by: Lesley Bruce Smith, ISA Certified Arborist

It has been a “good” year for funky leaf galls, or a bad year, I guess, depending on how you look at it. Galls are “abnormal vegetable growths caused by various agents, such as, insects, nematodes, fungi, bacteria, viruses, chemicals and or mechanical injury”. When our clients ask about these funny bumps on their tree leaves, I usually stop at the short explanation that they are completely harmless to the tree and normally caused by beneficial insects that lay their eggs in the leaf tissue which causes the strange growth they are seeing.