I said I didn't think I had any direct insect damage. However, this spring when I lifted the tree tubes to start weeding, I had a few tubes that had a hundred? June Bug husks inside!
If you want to go the nematode route now is the time to acquire your product. Sept-Oct is the perfect time for applying the treatment.
Arbico Organics is the outfit that I use for earth/food friendly pest management solutions.
https://www.arbico-organics.com/category/beneficial-nematodes