Q.joe pye weed
I planted a joe pye weed last year and the leaves are being eaten. I used an organic pest killer but it doesn’t seem to help. We have had an unusual amount of rain. Could this be a cause?
Neem Oil treatment should take care of most sucking insects on your plants.
You can reapply weekly to help control the pests.
The rain my have washed off your application of the insecticide.
Here are some links with more information.
https://www.gardeningknowhow.com/ornamental/flowers/joe-pye-weed/growing-joe-pye-weed.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm