I'm getting ready to Aerate, seed, and fertilize my lawn for the fall. The other day I found a few white grubs just under the surface. I live in NJ so I thought that they might die this winter and it may not be worth treating them now. Should I treat for them before I do my fall prep or just do the prep and let them die this winter? or would this be a good time to lay down a slow release grub killer for next season?