Knowledgebase
What's wrong with My Joe Pie Weed? #582400
Asked July 22, 2019, 11:48 AM EDT
Hennepin County Minnesota
Expert Response
The papery tan spots in the leaves of your Joe Pye weeds are the larvae of a fly like insect called a leaf miner. They do little permanent damage to your plant. Unfortunately insecticides can not work once they are inside of the leaves.
https://extension.umn.edu/yard-and-garden-insects/leafminers
https://hort.extension.wisc.edu/articles/leafminers-vegetables/