Sod Webworms Description:

Sod webworms are grayish-green caterpillars with dark brown heads and brown spots along the length of their bodies. The caterpillars live in silken tunnels at the base of grass blades, feeding on the grass blades at night and hiding in their tunnels during the day. Some species do not construct silken tunnels, but also live in the thatch layer.


Common grasses subject to sod webworm infestation include:

  • Kentucky bluegrass
  • Perennial ryegrass
  • Fine fescue
  • Bentgrass

Warm-season grasses such as bermudagrass and zoysiagrass are rarely affected, however, a tropical sod webworm may invade St. Augustinegrass.

Biology & Symptoms:

Small, brown areas appear as scalped turf enlarge as sod webworms continue to feed. An easy indicator is the presence of small moths flying just above the grass in the early evening hours or that flush out during mowing. Small green pellets (frass) may also be seen at the base of grass blades. Spring and summer are the common feeding seasons


Early detection is key by looking for close areas that appear scalped and caterpillars in silken tunnels. Insecticide treatments and fertilization are the most effective treatments. Schedule a consultation with your local landscape professional to learn more about the best practices to rid your lawn of sod webworms.

See More Articles

Armyworms Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn

Fall Armyworms

Fall armyworm caterpillars eat the leaves and stems of turfgrasses, but typically do not destroy the crown of the plant. Early feeding damage can resemble drought stressed turf, but can quickly progress to complete browning of the entire stand when caterpillars are present in large numbers.
Read More
Pest And Disease Bagworms Banner 1440X500
Leaf or Needle Dropping


Bagworms are destructive pests of shrubs and woody ornamentals that are native to North America. Their spindle-shaped protective bags made from silk, debris and foliage provide camouflage, so they go unnoticed until there is significant plant damage.
Read More

Get In Touch With Us!

We pride ourselves at Davey Tree on providing prompt, professional and personalized service from certified arborists that live, work and engage in your community. Contact one of our Davey Tree specialists for your residential needs.

Let's Find What
You're Looking For!