Common Lawn Pests by Damage Type
Lawn pests fall into three categories: root feeders that kill grass from below (grubs), surface feeders that chew grass blades (armyworms, sod webworms, chinch bugs), and burrowers that disrupt the soil surface (moles, voles). Identifying the damage pattern tells you which category you’re dealing with before you ever see the pest itself.
| Pest | Damage Type | Season | Key Sign | Treatment |
|---|---|---|---|---|
| Grubs | Root feeder | Late summer to fall | Turf pulls up like carpet | Preventive: May to June. Curative: August to September |
| Chinch Bugs | Surface feeder | Summer | Irregular yellow patches spreading outward | Bifenthrin or trichlorfon when damage appears |
| Armyworms | Surface feeder | Late summer to fall | Grass chewed to soil overnight | Bifenthrin spray at first sign (evening application) |
| Sod Webworms | Surface feeder | Summer | Small brown moths flying at dusk, chewed patches | Bifenthrin or carbaryl when larvae are active |
| Moles | Burrower | Spring and fall | Raised tunnels and volcano mounds | Trapping is the most effective method |
| Voles | Burrower and surface feeder | Winter | Surface runways visible after snow melts | Habitat reduction, bait stations |
Prevention vs Curative Treatment
Preventive treatments work before pests cause visible damage. For grubs, preventive products (chlorantraniliprole, imidacloprid) applied in May to June kill larvae before they hatch. Curative treatments are applied after damage is visible and are generally less effective and more expensive. The best pest management strategy: prevent the predictable ones (grubs), monitor for the unpredictable ones (armyworms), and act fast when damage appears.
Lawn Diseases vs Pests
Brown patches can be caused by pests or diseases, and the treatments are completely different. The key difference: pest damage has a physical cause you can find (grubs in the root zone, larvae on the surface, tunnels in the soil). Disease damage shows fungal signs (spots, rings, threads) and usually correlates with weather conditions (humidity, temperature). When in doubt, do the tug test: if the grass pulls up easily with no roots, it’s grubs.
