Grub insecticide harmful to Earthworms?

Recently I repaired section of my lawn by removing the soil and placing new soil and seed. I took note that I didn't see a single earthworm. I feel this is odd and not healthy... In my research I have learned to treat the lawn for grub prevention in Fall for best results. Is it possible that my grub... show more Recently I repaired section of my lawn by removing the soil and placing new soil and seed. I took note that I didn't see a single earthworm. I feel this is odd and not healthy... In my research I have learned to treat the lawn for grub prevention in Fall for best results. Is it possible that my grub prevention efforts in the past killed beneficial critters like earthworms?
2 answers 2