Reader Mary Heide shared this photo of a maple leaf with “strange spikes sticking out of it,” which she found at her home in Taylor County, Wisconsin. What is happening here?
Answer
These are maple spindle galls. As noted in this article by PennState Extension, maple leaves can be host to a variety of galls, and although “these galls may be aesthetically unappealing to some, they do not affect the overall health of the infested tree.”
This week’s contest winner was Rob Anderegg