Worms are great for the soil! If u have a lot of them, that generally means your soil is fertile and "workable".
The two most common grubs would be the japanese beetle grub and the june beetle grub. Although i have them in my
flower garden soil, they don't seem to bother anything. Although they can be troublesome if there's an infestation (they can eat the roots of
plants), i think they are most likely to cause damage to the roots of grass
growing in your yard.
I will also say that the adult japanese beetle is by far the worst nuisance to my garden! I hate them. This past year they were terrible.
As far as the topic of compost is concerned, i'll let other people in the forum give u advice on that. That's not my expertise...
The second worst pest in my garden would be the slug... and i am NOT afraid to use chemicals to kill them or japanese beetles!
I use the pellets for the slugs and assorted sprays for the beetles.
No, i don't have to worry about poisoning cats or dogs, because i am happily FREE from that "ball and chain"!!!