Sod Webworms on Florida Lawns

By mid February in Sarasota and Venice, small tan moths often flutter up when you walk the lawn at dusk. That is usually your first clue that sod webworms are active. These tiny caterpillars feed on grass blades at night and hide in the thatch by day. On Saint Augustine or Zoysia, the damage starts as ragged leaf edges and thin spots before larger brown patches appear.

This guide explains what homeowners in Bradenton and coastal neighborhoods should watch for, and how Greener Fields USA folds Insect Control into a full lawn program instead of treating every brown spot as a webworm problem.

Why Sod Webworms Show Up in Late Winter

Warm soil and fresh spring growth give caterpillars plenty to eat. Lawns that are already stressed from uneven water, dull mower blades, or thin shade areas often show damage first. Webworms rarely kill an entire yard overnight, but they can leave a patchy look that invites weeds and slows recovery.

Not every brown patch is a caterpillar. Drought, chinch bugs, and fungus can look similar from the driveway. A quick walk at dusk, plus a look at individual blades, usually tells the story.

Signs Your Lawn Has Sod Webworms

• Ragged blades: Chewed edges or translucent "window" spots on individual leaves.
• Small moths at dusk: Tan moths that scatter when you step on the turf.
• Green pellets in thatch: Caterpillar waste left near the soil surface.
• Patchy thinning: Areas that look scalped but still have some live stolons.

A simple check you can do at home

Mix a few tablespoons of dish soap in a gallon of water and pour it over a one foot square of suspect turf. Irritated caterpillars often come to the surface within a few minutes. If nothing appears, the problem may be water, disease, or another insect entirely.

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Step by Step: How Professional Insect Control Helps

Step 1: Confirm the pest

We look at blade damage, thatch depth, and recent weather before treating. Spraying the wrong product on a drought stressed lawn adds stress without solving the real issue.

Step 2: Time treatments to feeding habits

Webworms feed on the leaf surface, so applications are planned around when larvae are active and when your irrigation schedule will not wash product off target.

Step 3: Protect the grass you want to keep

Product choice and rate matter on Saint Augustine. Our Insect Control visits follow label rules for turf type, beds, and tree roots near the treatment zone.

Step 4: Follow up on recovery

After caterpillar pressure drops, steady Fertilization and sensible mowing help the lawn fill back in. Skipping that step leaves thin areas where weeds move in later.

When Brown Patches Mean Something Else

Yellowing that spreads along sidewalk edges may point to chinch pressure or dry irrigation zones. Greasy spots after humid nights can mean Fungus Treatments should lead. We sort those lanes first so you are not chasing caterpillars through a water or disease problem.