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One of the big problems with lawns (in my neighbourhood) are grubs which eat the roots of the grass and kill it. they are also tastey for critters such as racoons and skunks, who who will tear up your grass overnight trying to dig up the grubs. I've had large patches of my grass torn up due to this.
You can use a chemical to kill them (diazanon) but I shudder at the thought of putting that on my grass. Here the cycle of the grub is early spring, then august (i mean that is the time to treat the grass) after the grubs mature they turn into june Bugs or japanese stag beetles.
another option to kill grubs is a worm that you can by at any garden centre (nemotodes) which you hydrate (they are in a sponge) in a bucket then spray over your lawn. these worms like to eat the grubs. But their effectiveness is somewhat less than the chemical solution.
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