St. Petersburg's warm, humid climate is ideal for lawn pests. The good news is that most damage follows recognizable patterns — if you know what to look for, you can catch problems before they destroy your lawn.
Chinch Bugs — #1 Pest in St. Pete
Southern chinch bugs attack St. Augustine grass almost exclusively and are worst during hot, dry summer months. They suck sap from grass blades and inject a toxin.
Damage: Irregular yellow-to-brown patches in the sunniest areas. The damaged zone slowly expands outward. Unlike drought stress, patches do not recover after watering.
Treatment: Bifenthrin or permethrin-based insecticides applied to the affected area and a buffer zone. Multiple treatments may be needed. Florida law requires a licensed applicator for certain pesticide applications.
Sod Webworms
The larvae of tropical sod webworm moths feed on grass blades at night and hide in the thatch during the day. Damage appears as irregular, scalped-looking patches.
How to spot: Small moths flying just above the lawn at dusk. Larvae are 3/4-inch greenish caterpillars with dark spots — look in the thatch with a flashlight at night.
Treatment: Bt (Bacillus thuringiensis) is an organic option effective against young larvae. Spinosad or conventional insecticides also work. Apply in the evening when larvae are active.
Mole Crickets
Mole crickets tunnel through the soil just below the surface, severing grass roots and creating raised tunnels. Especially damaging to Bermuda and bahia grass lawns.
Treatment: Treat in late spring when nymphs are small. Beneficial nematodes are a biological option. Chemical treatments include imidacloprid or bifenthrin. Timing is critical — large adults are much harder to kill.
Grubs
White grubs feed on grass roots, causing turf to die in patches. Tug test: try to roll back the turf like a carpet — if it lifts easily with no root resistance, grubs are likely present.
Treatment: Preventive grub treatments applied in spring (imidacloprid) are most effective. Curative treatments work on young grubs but are less effective on large ones.
When to Call a Professional
Florida law (Chapter 482) regulates lawn pest control applications. If you are unsure what pest you have, or if the infestation is severe, hire a licensed pest control operator.
Consistent mowing means healthier, more pest-resistant grass.
Well-maintained St. Augustine lawns are more resilient to pest pressure. Amber Lawn Care keeps your lawn mowed at the right height, every visit. Request a quote.
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