Your lawn faces threats from below (grubs, mole crickets), above (chinch bugs, armyworms), and within (fungal diseases). This guide covers identification, treatment timing, and prevention for every common lawn problem.
Below-ground pests feed on grass roots, causing patches of turf that wilt, turn brown, and pull up like a carpet. Damage is often mistaken for drought stress or fungal disease.
White grubs — the larvae of Japanese beetles, June bugs, and other scarab beetles — are the most common below-ground lawn pest in the eastern United States. C-shaped white larvae feed on grass roots from late summer through fall and again in spring.
Damage signs: Irregular brown patches that peel back easily. Increased bird, skunk, or raccoon digging (they are eating grubs). More than 10 grubs per square foot in a 4×4-inch deep soil sample indicates treatment is needed.
Treatment: Imidacloprid or chlorantraniliprole applied preventively in June–July before eggs hatch. For existing infestations, carbaryl or trichlorfon provide curative control. Organic options include milky spore and beneficial nematodes.
Mole crickets tunnel through soil and feed on grass roots, primarily in the Southeast. Their tunneling creates spongy, uneven turf that dies in irregular patches.
Treatment: Bifenthrin granular applied in June when nymphs are small. Water in immediately after application. Beneficial nematodes (Steinernema scapterisci) are an effective biological control for mole crickets.
Chinch bugs suck sap from grass blades and inject a toxin that causes yellowing and death. They prefer hot, sunny areas — damage typically starts along driveways, sidewalks, and south-facing slopes. St. Augustine grass is particularly susceptible.
Treatment: Bifenthrin or lambda-cyhalothrin applied to affected areas. Water the lawn the day before treatment to bring chinch bugs to the surface.
Sod webworms are the larvae of lawn moths. They chew grass blades at the soil surface, creating irregularly shaped brown patches. You may notice small tan moths flying in a zigzag pattern over the lawn at dusk — these are the adults laying eggs.
Treatment: Bt (Bacillus thuringiensis var. kurstaki) is an effective organic option that targets caterpillars without harming beneficial insects. Apply in late afternoon when caterpillars are actively feeding. Bifenthrin or spinosad are also effective.
Fall armyworms can devastate an entire lawn in 48 hours. They migrate from the south in late summer and feed voraciously on all grass types. Watch for bird flocks feeding on your lawn — this often precedes visible armyworm damage.
Treatment: Speed is critical. Apply bifenthrin or spinosad immediately upon detection. Mow the lawn short first to improve product contact with the caterpillars.
Lawn diseases are caused by fungi that thrive under specific temperature and moisture conditions. Correct identification matters because different diseases require different treatments.
Circular patches of brown, thinning turf with a distinctive dark "smoke ring" at the outer edge, most visible in early morning dew. Caused by Rhizoctonia solani. Most active when nighttime temperatures exceed 65°F and humidity is high. Common on tall fescue, perennial ryegrass, and St. Augustine grass.
Treatment: Reduce irrigation frequency (water deeply but infrequently). Improve air circulation. Fungicide applications with propiconazole or myclobutanil can control active infections. Avoid high-nitrogen fertilizer during hot, humid weather.
Small, silver-dollar-sized tan spots that can merge into larger damaged areas. White, cobweb-like mycelium visible in early morning dew. Most common on nitrogen-deficient lawns during warm, humid weather.
Treatment: Apply nitrogen fertilizer — dollar spot often resolves when the lawn is properly fed. Reduce thatch buildup. Water deeply in the morning so grass blades dry before evening.
Circles or arcs of dark green grass, dead grass, or mushrooms. Caused by fungi decomposing buried organic matter (old tree roots, construction debris). Not directly harmful to grass in most cases.
Treatment: Core aerate through the ring to improve water penetration. Drench with water to push the hydrophobic fungal mat below root level. Fairy ring is persistent but rarely kills grass permanently.
A healthy lawn is the best defense against pests and diseases. Organic lawn care focuses on building soil health and grass vigor rather than reactive chemical treatment.
For complete organic garden pest management, see our Organic Pest Control Guide and Organic Pest Control Hub.
Content on this site is reviewed by Derek Giordano, a former pest control company owner and previously licensed Pest Control Operator in Florida with several years of field experience servicing thousands of regular customers. Reviews check treatment recommendations against current EPA-registered products and label use directions, cross-reference major treatment claims against university extension publications and CDC public health guidance, and verify that any product mentions reflect current registration status and reasonable consumer availability. Pages get updated as treatment recommendations evolve — pesticide products are deregistered, resistance patterns shift, regional pest distributions change. The 'Updated' date at the bottom of each page reflects the most recent review pass on that specific page; the site-wide approach to E-E-A-T (experience, expertise, authoritativeness, trustworthiness) follows Google's published guidance on health and safety topics.
Pesticide efficacy is highly sensitive to the conditions at application and immediately after. Temperature affects both vapor pressure (volatility) and residual binding — products applied above ~90°F often volatilize before binding to surfaces, while applications below ~50°F can fail to spread properly. Surface porosity changes residual duration: a residual that lasts eight weeks on a sealed concrete slab might last three weeks on bare wood. Rainfall within four hours of an outdoor application typically washes off most surface deposits, though microencapsulated products are more rain-fast. UV exposure degrades many pyrethroids within days to weeks on sunny surfaces, which is why fence-line applications often fail mid-summer. Indoor humidity affects bait acceptance — dry baits perform worse in high humidity as they absorb moisture and lose palatability. Reading conditions correctly explains many otherwise mysterious treatment failures.
Editorial sources used consistently across this site: the EPA pesticide registration database for current product use directions and active ingredient information; CDC for public health context on pest-borne disease; the National Pesticide Information Center (NPIC) for homeowner pesticide questions; university Cooperative Extension publications (UC IPM, NC State Extension, Penn State Extension, University of Florida IFAS, and others) for region-specific identification and treatment guidance; the National Pest Management Association (NPMA) for industry context; and peer-reviewed entomological literature for biology, resistance management, and emerging issues. Product reviews reflect editorial testing and aggregated user-reported outcomes rather than manufacturer-supplied claims. Where regional information matters, we link to state and local extension publications rather than generalizing across regions.
This guide is one entry point in a connected library. Each pest profile, treatment guide, and tool on this site links to related references that go deeper than any single page can. Working through a pest problem effectively usually means starting with identification (so you know what you're treating), reading the species-specific treatment guide, checking the product or tool references for specific selection guidance, and confirming approach with the FAQ and troubleshooting sections. Bookmarking a few core references — the species profile, the relevant treatment guide, and one tool that supports the decision-making (product selector, cost estimator, treatment schedule) — gives you a workflow you can return to as the situation evolves. The structure is intentional: surface-level summary first, then increasing depth, with the deepest detail in the dedicated tool and reference pages.
Integrated Pest Management (IPM) is the framework most pest management professionals follow and the framework the EPA recommends for residential and commercial settings. IPM is not anti-pesticide; it's a sequencing approach that uses cultural controls (sanitation, exclusion, moisture management) first, mechanical controls (traps, vacuuming, physical removal) second, biological controls (beneficial insects, microbial agents) where applicable, and chemical controls last and targeted. The benefit isn't ideological — it's empirical. IPM-treated sites have lower long-term pest pressure than chemical-only treated sites, because chemicals address the visible population without addressing why the population developed. Homeowners who adopt IPM principles see longer intervals between treatments, lower total pesticide use, and better outcomes during the times when chemicals are appropriate. The shift from 'spray when I see them' to 'fix the conditions, monitor, treat targeted' is the single highest-leverage change most DIY practitioners can make.
Pest control companies vary substantially in approach, training, and pricing, and the questions to ask before signing a contract often aren't the obvious ones. Worth asking: what's the technician's training and certification (state pest control certification is the floor; advanced training in IPM, structural inspection, or specific pest specialties is meaningful additional credentialing); what does the service include beyond visiting and spraying (inspection, monitoring, exclusion recommendations, follow-up scheduling); what guarantees apply if pests return between visits; what's the protocol for hard-to-resolve issues (some companies escalate to senior technicians or supervisors; others repeat the same approach); what active ingredients are used and whether the company will use specific products on request (homeowners with chemical sensitivities, pollinator gardens, or other concerns may want specific products); and what's the contract structure (per-visit, annual, multi-year). Worth less than expected: brand recognition and advertising spend (large national chains and small local operators both produce excellent and mediocre service); 'green' or 'organic' labels (which mean different things to different companies and often don't correspond to specific product or practice differences); price alone (typical pricing variance is modest, and the floor of cheap options often includes poor service).
Most homeowners treat pest issues episodically and lose information between events. Building a simple ongoing pest file — even a single document in a notes app or folder of photos — produces compounding benefits across years of property ownership. The contents that matter: date and location of every notable sighting, identification (with photos where possible), treatment applied and product names used, professional service records and warranty terms, structural sealing work performed and where, drainage and moisture correction work performed, and observations across seasons. Over two or three years, patterns emerge that aren't visible in single incidents: which months reliably bring ant activity, which exterior corner gets wasps every spring, which entry points keep failing, which products actually worked versus which were tried and abandoned. This file becomes useful at property sale (documenting professional treatment and remediation), at insurance claim time (documenting pre-existing conditions or treatment history), and at any future pest problem (where past records narrow the diagnostic space immediately). The effort to maintain is minimal — a few minutes per incident — and the cumulative information value substantial.
Integrated pest management (IPM) is a structured approach to pest control developed for agricultural and commercial settings that translates well to residential use. The hierarchy: prevention first (sanitation, exclusion, habitat modification to make conditions unfavorable for pests), monitoring second (sticky monitors, visual inspection, identifying pests at low population before infestation establishes), targeted intervention third (using the least disruptive effective method against an identified pest in an identified location), and broad chemical treatment last (when targeted approaches have failed or aren't feasible). The hierarchy matters because higher-level interventions are durable and address root causes, while lower-level chemical interventions address symptoms and require repeat application. Most residential pest control reverses this hierarchy — chemical treatment first, sometimes prevention later — and produces the predictable consequence of recurring problems. Households that adopt the IPM hierarchy (often without using the term) generally describe spending less time and money on pest issues over years even though specific incidents might take more thought to address than spray-and-forget approaches.
Homeowners' associations vary widely in how they engage with pest control, and the variations create practical issues that affect individual treatment decisions. Some HOAs maintain common-area pest treatment programs that handle perimeter spraying, mosquito treatment, or rodent monitoring on shared property; others leave all pest control to individual homeowners. Some have rules about treatment products or notification requirements; others don't. Some include treatment in the HOA fee structure; others bill separately. For homeowners in HOA communities dealing with persistent pest pressure, understanding what the HOA does and doesn't do is the first step in figuring out what additional individual action is needed. For HOAs without coordinated programs in areas with significant pressure, organizing a neighborhood-level treatment plan often produces dramatically better results than individual treatment efforts that don't coordinate timing or coverage. The conversations are sometimes politically awkward in HOA contexts, but the underlying problem — that some pests are neighborhood-scale and unit-level treatment can't address them — is structural rather than personal. Bringing the issue to an HOA meeting with concrete proposals tends to produce more constructive responses than complaint-style framing.
Pest control warranties are not standardized, and the differences between contracts that look superficially similar can be enormous. Termite warranties in particular vary across at least three significant dimensions: whether they cover retreatment only or also include damage repair, whether the damage coverage is capped or unlimited, and whether the warranty is transferable to subsequent owners. A retreatment-only warranty on a property with significant termite pressure is much weaker than a damage-inclusive warranty, and the difference matters most precisely in the situations where the warranty is most likely to be needed. General pest control service agreements often have similar gradations — some include unlimited callbacks during the service period, some include a fixed number, and some charge for any visit outside the regular schedule. Before signing, the question to ask is not whether the contract has a warranty, but exactly what the warranty covers, what triggers a callback at no charge, and what the renewal terms are. Companies rarely volunteer this clearly; reading the document carefully and asking specific questions is on the homeowner.
The quality of pest information available to homeowners varies enormously by source, and finding the reliable sources for your specific region is a one-time investment that pays off across years of pest management decisions. Cooperative extension services associated with land grant universities in each state are usually the highest-quality regional resource, producing fact sheets, identification guides, and treatment recommendations specifically calibrated to local conditions, pest species, and regulatory environments. State department of agriculture pest fact sheets are typically similar in quality and orientation. Local pest control company blog content varies in quality but can be useful when produced by experienced practitioners writing about their actual work rather than generic SEO content. National pest control sites tend to be less useful for the specific reason that they average across regions and don't address the conditions you're actually facing. Bookmarking two or three high-quality regional resources at the outset, and consulting them before making significant pest management decisions, raises the average quality of your decisions dramatically without much ongoing effort.