Ok. Worm - grub. Started really small. Now at least inch long. I have put enough product on this lawn to treat 6 lawns. I see dead crickets, dragon flies, etc....there still here. Very heavy grass, alot of thatch - should it to power raked (dethatched) and mowed short to what I see in my eyes to break the barrier b/t these little pest and the granular to get down there? Also the irrigation is down to 2 days a week - should we shut it off completely. I have never had an entire yard with grubs - at best a little spot and that was it.