I've seen many ways to kill grub worms, but nothing on whether the treatment for grub worms will effect earthworms. Do the treatments also destroy earthworms?
Certified GKH Gardening Expert
That could be a possibility; however, there are also natural ways to kill grubs but not earthworms. This article will help with that, look towards the bottom: https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm