4. Bare or ragged patches
Bare spots in your lawn may be a sign of nothing more than heavy traffic or too much dog stuff. If heavy traffic is the culprit, consider replacing grass with a gravel walkway, and make dog-poop cleanup part of your weekly lawn maintenance. However, bare spots may also be caused by armyworms, which you’ll probably be able to see crawling around in the soil. Rather than resort to fertilizers or additional grass seed, kill the armyworms off with beneficial nematodes, which you can buy from online retailers.