What Is Eating My Florida Lawn? How to Spot Chinch Bugs, Armyworms, and Sod Webworms
If you have brown spots on your lawn and have found yourself searching “what is eating my grass?”, you are not alone.
Florida’s heat, humidity, and long growing season create ideal conditions for a variety of lawn pests. In areas like Panama City, Panama City Beach, and Fort Walton Beach, three pests homeowners should know how to recognize are chinch bugs, armyworms, and sod webworms.
Here’s how to recognize some of the clues these common Florida lawn pests leave behind.
Why Is My Florida Grass Turning Brown?
A brown lawn does not automatically mean your grass needs more water.
In fact, one of the biggest warning signs of a possible pest problem is grass that continues to brown or thin even after receiving adequate irrigation.
Common signs that something may be feeding on your lawn include:
- Brown or yellow patches that continue to expand
- Areas of grass that look thin or weak
- Grass blades that appear chewed, notched, or ragged
- Bare areas developing within previously healthy turf
- Damage that seems to appear very quickly
- Sections of lawn that do not improve after watering
- Caterpillars, small insects, or increased moth activity around the lawn
The pattern of the damage can provide important clues about what might be happening beneath your feet.
Chinch Bugs in Florida Lawns: Look for Expanding Brown Patches
If you have St. Augustine grass, chinch bugs should be high on your list of suspects.
These tiny insects feed on the grass and can cause areas of turf to turn yellow, then brown, and eventually die if the infestation becomes severe. Damage commonly begins in sunny, hot, or water-stressed portions of the lawn.
One helpful place to inspect is the border between healthy green grass and damaged brown turf. Adult chinch bugs are tiny and typically black and white, while younger nymphs can appear orange or reddish.
Armyworms in Florida: When Damage Seems to Happen Overnight
Fall armyworms are actually caterpillars that feed directly on grass foliage. While the name suggests they are only a fall problem, armyworms in Florida can affect turf at other times of the year depending on conditions. UF/IFAS reports that they feed on a variety of grasses and can produce widespread damage when populations become large.
Mature fall armyworms can reach roughly 1.5 inches long and may be green, brown, or darker in color. One of their more recognizable features is a light-colored, upside-down “Y” shape on the head.
Sod Webworms: Look for Chewed Blades and Thinning Turf
Another caterpillar that can cause trouble for Florida homeowners is the tropical sod webworm.
Sod webworms feed on warm-season grasses commonly found in Florida. Unlike some insects you may easily spot during the day, sod webworm larvae tend to feed at night and hide in the thatch during daylight hours.
Chinch Bugs vs. Armyworms vs. Sod Webworms
While a professional inspection is the best way to determine exactly what is damaging your lawn, the pattern can give you an early clue.
| What You’re Seeing | Possible Culprit |
| Yellow or brown patches in hot, sunny areas | Chinch bugs |
| Brown grass that does not improve with watering | Chinch bugs or another turf problem |
| Large areas suddenly looking closely mowed or stripped | Armyworms |
| Jagged, chewed grass blades | Armyworms or sod webworms |
| Gradual thinning with irregular brown patches | Sod webworms |
| Caterpillars visible in or around the turf | Armyworms or sod webworms |
| Tiny insects near the edge of brown and green grass | Chinch bugs |
These signs are only a starting point. Drought, irrigation problems, fungal disease, improper fertilization, soil conditions, and other pests can create similar symptoms.
Professional Lawn Pest Control in Panama City Beach & Fort Walton Beach
When brown patches begin spreading, catching the problem early can make a major difference.
Brock Lawn & Pest Control provides professional lawn pest control in Panama City Beach, Panama City, Lynn Haven, Callaway, and communities throughout Northwest Florida. Brock also provides lawn care in Fort Walton Beach, Destin, Niceville, and surrounding areas.
Rather than guessing at what is causing your lawn to turn brown, let an experienced lawn professional take a closer look.
Stop Asking “What Is Eating My Grass?” and Find the Real Cause
If your lawn is thinning, developing brown patches, showing chewed blades, or failing to improve despite regular watering, it may be time for a professional evaluation.
Whether the culprit is chinch bugs in your Florida lawn, armyworms, sod webworms, or another lawn health issue, Brock Lawn & Pest Control can help identify the problem and recommend the right approach for your property.
Lawn Pests FAQs
How do I know if brown patches are caused by lawn pests or heat?
Heat and drought stress often improve with proper watering, while pest damage may continue to spread even when the lawn receives enough moisture. Chewed grass blades, visible insects, rapid thinning, or expanding damaged areas can also point to a pest problem.
When are lawn pests most active in Northwest Florida?
Many Florida lawn pests become more active during the warm, humid months. Summer and early fall can be especially problematic for chinch bugs, armyworms, sod webworms, and other insects that thrive in warm conditions.
Who provides lawn pest control in Panama City Beach and lawn care in Fort Walton Beach?
Brock Lawn & Pest Control provides professional lawn care and lawn pest control services throughout Northwest Florida, including Panama City Beach, Panama City, Fort Walton Beach, Destin, Niceville, and surrounding communities.
