Most dead patches blamed on chinch bugs are actually drought stress, fungus, or a broken irrigation head.
One call reaches a licensed, local exterminator who covers your address — and a real person answers, 24/7.
Talk to a licensed exterminator now
Call and we’ll connect you with a licensed, local exterminator who covers your address. It takes about two minutes, and a real person answers.
Free to get matched. No obligation. The licensed operator gives the quote.
24/7 line · A real person answers · Availability of same-day and emergency service depends on the provider.
What is actually killing the grass
These are the realistic causes of a dying patch in a Polk County lawn. The first three are insects; the rest are the things most often mistaken for them.
Southern chinch bug
The single most damaging insect pest of St. Augustinegrass in Florida. Tiny black-and-white insects at the soil line, concentrated at the edges of the dying area rather than in its dead center. Damage appears as expanding yellow-to-brown patches, worst in hot dry weather and in sunny areas along driveways and sidewalks.
Tropical sod webworm
Larvae of a small moth that chew grass blades, producing ragged, notched leaf edges and a scalped, uneven look rather than a distinctly dead patch. Feed at night. Most active in the warm wet months, roughly summer into fall. Look for green pellet-like droppings in the thatch.
Mole crickets
Primarily a bahiagrass and bermudagrass problem in Florida rather than St. Augustine. They tunnel just below the surface, disturbing roots and creating spongy soil that feels loose underfoot, with soil pushed up in irregular trails.
Drought and irrigation failure
By far the most common misdiagnosis. A stuck or blocked irrigation head, poor coverage, or simple water restriction produces bluish-grey wilting grass with folded blades and lingering footprints — a pattern that maps to the sprinkler layout rather than spreading organically.
Fungal disease
Large patch and gray leaf spot both affect St. Augustine in Florida’s humidity. Large patch produces roughly circular patches often with a distinct edge, typically in cooler wet conditions; gray leaf spot produces lesions on the blades themselves. Insecticide does nothing for either.
Nematodes and soil issues
Microscopic root feeders that produce thin, weak, poorly rooted turf that never quite responds to fertilizer or water. Common in Florida’s sandy soils, difficult to diagnose without a soil assay, and not addressed by surface insecticide.
Patches spreading and you are not sure why?
One call reaches a licensed, local exterminator who covers your address — and a real person answers, 24/7.
Free to get matched. No obligation. The licensed operator gives the quote.
Why Polk County lawns struggle in specific ways
St. Augustinegrass dominates, and chinch bugs specialize in it
The overwhelming majority of residential lawns across Lakeland and Polk County are St. Augustinegrass, chosen for its tolerance of heat and its performance in the region’s sandy soils. The southern chinch bug feeds almost exclusively on it. That combination — a near-monoculture of the one host species across an entire county — is why chinch bugs are such a persistent regional problem, and why a neighborhood can see damage move from lawn to lawn across a summer.
Sandy soil drains fast and holds little
Polk County’s sandy soils, and particularly the deep well-drained sands along the Lake Wales Ridge, drain rapidly and retain little water or nutrient. Turf here moves from adequately watered to drought-stressed much faster than on heavier soil, and drought-stressed St. Augustine is both more attractive to chinch bugs and less able to recover from feeding damage. A great deal of what gets diagnosed as an insect problem in Polk County is a soil and irrigation problem that made an insect problem possible.
Heat and sun concentrate the damage
Chinch bug damage characteristically shows first and worst in the hottest, driest, most sun-exposed parts of a lawn — strips along driveways, sidewalks and south-facing walls where reflected heat raises soil temperature. If your dying areas are in full sun along hardscape while the shaded areas stay green, that pattern is meaningful and worth pointing out to whoever inspects.
Water restrictions and rules constrain the fix
Polk County and its municipalities operate under water management district rules that govern irrigation days and times, and Florida also has statewide restrictions on fertilizer application in some circumstances. This genuinely limits the response available — you cannot simply water a stressed lawn back to health on demand — which is another reason correct diagnosis matters. Check current local irrigation rules before assuming more water is the answer.
How the work is actually done
Diagnosis at the edge of the damage
A competent inspection looks at the boundary between healthy and dying turf, parts the grass to the soil line, and checks for insects, thatch depth, root condition and moisture — because the dead center tells you nothing.
Confirm before treating
Techniques like flushing a section with soapy water to bring chinch bugs and webworm larvae to the surface, or simply examining blades for lesions, distinguish insect damage from disease and drought in minutes.
Treat the confirmed cause
Insecticide for a confirmed insect population, fungicide for a confirmed disease, and irrigation or cultural correction where that is genuinely the issue. These are different products and different licenses from structural pest control.
Fix the underlying condition
Correcting irrigation coverage and timing, managing thatch, mowing at the correct height for St. Augustine, and appropriate fertility. Without this, the same problem returns next season regardless of what was sprayed.
What decides the operator’s quote (we never set prices)
- Lawn size and the extent of damage — Treatable area drives most of it, and a lawn needing partial renovation is a different conversation from one needing a corrective treatment.
- Whether it is a one-time treatment or a program — Recurring pressure in a St. Augustine lawn on sandy soil often does better on a maintenance program than on reactive spot treatment.
- What the actual diagnosis turns out to be — An insect treatment, a fungicide application and an irrigation correction are entirely different scopes, which is exactly why the diagnosis comes first.
Pricing is set by the independent licensed operator after inspection — never by us. Free to get matched, and you owe nothing until you accept the operator’s own quote. The cost guide covers the general factors.
How the lawn pest dispatch works
Full transparency: Lakeland Exterminators is a dispatch and matching service, not a licensed pest control operator. Your request routes by ZIP to an independent, FDACS-licensed operator covering your part of Polk County; they own the inspection, treatment, pricing and any service warranty under Chapter 482, Florida Statutes. Verify any operator at the FDACS license search before you hire — honest companies expect it.
Worth knowing before you call: in Florida, lawn and ornamental pest control is a distinct licensing category from general household pest and rodent control and from termite and wood-destroying organism work. Not every company holds every category, so if you need both indoor pest service and turf work, ask directly rather than assuming one visit covers both.
Lakeland lawn pest questions, answered straight
How do I know if it is chinch bugs or just drought?
Look at the edge of the damage and look at the pattern. Drought-stressed St. Augustine turns bluish-grey before it browns, the blades fold along the midrib, and footprints stay visible where you walked — and the pattern usually follows irrigation coverage, with dry arcs and wedges matching sprinkler throw. Chinch bug damage is yellow-to-brown and expands outward, worst in full sun along driveways and walls, and the insects themselves are found alive at the margin between green and dying grass. Parting the grass to the soil at that boundary, or flushing a patch with soapy water, settles it quickly.
Will regular pest control service treat my lawn too?
Usually not, and this surprises people. Household pest control and lawn and ornamental work are separate FDACS license categories in Florida, and many companies hold one but not the other, or price them as entirely separate services. If your quarterly service is for ants, roaches and rodents inside and around the structure, it almost certainly does not include turf insect treatment. Ask specifically whether lawn treatment is included and which license category the company holds for it.
When is chinch bug season in Polk County?
Damage is most pronounced during the hot months, generally building through late spring into summer and often peaking in the hottest, driest stretches. Florida’s warmth allows multiple generations per year and activity over a longer span than in cooler states, so the practical guidance is to start watching for the characteristic sun-exposed yellowing patches as soon as the weather turns consistently hot, and to check the edges of any expanding patch rather than waiting to see whether it recovers on its own. Early detection makes a substantial difference to how much turf you lose.
Can I treat lawn insects myself?
Consumer turf insecticides exist and can work against a correctly identified surface-feeding insect, so it is not hopeless. The failure mode is almost always diagnosis rather than product: people treat repeatedly for chinch bugs when the real problem is a fungal disease, a failed irrigation zone, nematodes or compaction, and the lawn keeps declining while they conclude the product is weak. If you are going to treat yourself, do the confirmation step first — get down at the boundary of the damage, part the grass, and actually find the insects before you buy anything.
Why does the same patch keep dying every year?
Because the underlying condition was never corrected. Recurring damage in the same location usually points to something structural about that spot — an irrigation head that does not reach it, reflected heat from a driveway or south wall, compacted or exceptionally sandy soil, excessive thatch, or shade and drainage conditions that favor disease. Insecticide addresses the insect that exploited the weakness, not the weakness. If the same three-metre patch has died three summers running, the answer is in the irrigation audit and the soil, not in a stronger product.
Do mole crickets affect St. Augustine lawns here?
Much less than they affect bahiagrass and bermudagrass, which are their preferred hosts in Florida. Since most Polk County residential lawns are St. Augustine, mole crickets are a comparatively uncommon cause of residential damage here, though they matter a great deal on pasture, sports turf and bahiagrass areas. If your turf feels spongy underfoot with soil pushed up in irregular tunnels, mole crickets are worth investigating — but on a St. Augustine lawn showing sun-exposed expanding brown patches, chinch bugs, drought or disease are far more likely.
Diagnose it properly, then treat it once.
One call reaches a licensed, local exterminator who covers your address — and a real person answers, 24/7.
Free to get matched. No obligation. The licensed operator gives the quote.
Disclosure
Lakeland Exterminators is a dispatch and matching service. We connect Polk County callers with independent, FDACS-licensed structural pest control operators. We are not a licensed pest control operator. We do not perform lawn treatments or turf inspections, set prices, issue warranties, or carry pest control trade insurance. All pricing, scheduling, treatment plans, warranties and service terms are determined by the independent FDACS-licensed operator dispatched to your address under Chapter 482, Florida Statutes.
Same-day and 24/7 emergency services are subject to provider participation, location, technician availability, and demand. Availability is not guaranteed and may vary by market and appointment capacity.
License status of any operator you connect with is publicly verifiable at the FDACS license search.