Active Ingredient Profile

Glyphosate Herbicide

Phosphonoglycine (Broad-spectrum Systemic Herbicide)

Glyphosate is the most widely used herbicide in history. It kills nearly all plants by inhibiting the EPSP synthase enzyme in the shikimate pathway - a metabolic process that exists in plants and microorganisms but NOT in animals. It is the active ingredient in Roundup and hundreds of generic products.

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Classification
Phosphonoglycine (Broad-spectrum Systemic Herbicide)
Signal Word
Caution to Warning
Mode of Action
EPSP synthase inhibitor: blocks shikimate pathway preventing production of essential amino acids, killing the plant systemically
⚖️ Educational use only. Always read and follow the full product label — the label is the law under FIFRA. Full disclaimer → | ⚗️ Mixing Calculator →

Target Pests

Nearly all annual and perennial weeds, grasses, broadleaf plants, and woody brush. Non-selective - kills virtually any green plant it contacts. Used for: driveway/patio weed control, fence line clearing, pre-planting field preparation, stump treatment, invasive plant management. Does NOT work as a pre-emergent - only kills actively growing plants.

Products and Brand Names

Roundup (Bayer/Monsanto - the iconic brand), Ranger Pro, Compare-N-Save Concentrate 41% Glyphosate, RM43 (with imazapyr for total vegetation control), Rodeo (aquatic-labeled formulation), Hi-Yield Super Concentrate, hundreds of generic 41% glyphosate concentrates.

Safety and Precautions

Low acute toxicity to mammals, birds, and fish. The active ingredient glyphosate has an excellent acute safety profile. However, the formulated products (especially those containing POEA surfactant) have higher toxicity than the active ingredient alone.

Cancer controversy: The IARC (WHO cancer research agency) classified glyphosate as a probable carcinogen (Group 2A) in 2015. However, EPA, EFSA, and most other regulatory agencies have concluded it is not likely carcinogenic at real-world exposure levels. This remains actively debated. Major litigation has resulted in billions in settlements. The science is genuinely uncertain at chronic low-dose exposures.
Pollinator note: While glyphosate does not directly kill bees, it kills flowering weeds that pollinators depend on for food. Broad herbicide use reduces pollinator habitat. Consider leaving some flowering areas unmowed/untreated.

Pro Tips

Application basics: Apply to actively growing weeds on a calm, dry day. No rain for 6 hours after application. Visible results in 7-14 days (it works slowly because it is systemic - traveling from leaves to roots). Do not mow for 7 days before or after application.

Concentration guide: For annual weeds: 1-2% solution. For perennial weeds (dandelions, quackgrass): 2-3%. For woody brush and stumps: 5-10%. Most consumer products are pre-diluted ready-to-use at appropriate concentrations.

The drift problem: Glyphosate kills ANY plant it contacts. Spray drift onto desirable plants, trees, and gardens is the number one complaint. Use a shield or cardboard barrier when spraying near valued plants. Never spray in wind above 5 mph. Foam markers help prevent overlap.

Non-selective means NON-SELECTIVE: It will kill your grass, your flowers, and your vegetable garden just as effectively as it kills weeds. For lawn weed control, use selective herbicides (2,4-D, dicamba) that kill broadleaf weeds but spare grass.

🐛 Pests This Treats — Learn More

Click any pest to view its full identification guide, biology, and treatment options.

🐛 Ants → 🐛 Scales → 🐛 Ticks →

🌿 Environmental & Ecological Impact

🐝 Bees / PollinatorsLOW
🐟 Fish / Aquatic LifeLOW
🐦 BirdsLOW
🐕 Mammals / PetsLOW
🦐 Aquatic InvertebratesLOW
💡 Low direct toxicity to animals. Non-selective herbicide — kills all plants it contacts. Binds tightly to soil.

⏱️ Residual & Re-entry Timeline

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Apply
Follow label mixing and application rates
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Re-entry: After spray dries
Keep people and pets out of treated area
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Effective period: N/A — kills on contact
Active residual — killing or repelling target pests
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Reapply
Re-treat when pest activity returns or residual expires

🔄 Alternatives & Related Products

Same chemical class or different approaches to the same pests.

↔️
Pyrethrin
Different approach: Botanical Pyrethrin
 ↔️
Boric Acid
Different approach: Inorganic
Example
0.5 oz
per gallon
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❓ Frequently Asked Questions

Q: Is glyphosate safe for pets?
Follow the product label. Keep pets out of treated areas until completely dried (2–4 hours for sprays). Once dry, treated surfaces pose minimal risk to dogs and cats.
Q: Can I use glyphosate indoors?
No — this is an outdoor-only herbicide.
Q: How long does glyphosate last after application?
Residual varies by formulation, surface type, weather, and UV exposure. Indoor applications last longer than outdoor. Check the product label for re-application intervals.
Q: What should I do if exposed?
Remove contaminated clothing, wash skin with soap and water. For eye contact, rinse 15–20 minutes. For ingestion or severe symptoms, call Poison Control (1-800-222-1222). Have the product label available.

📋 Safety Data Sheet (SDS)

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Glyphosate Herbicide — Safety Data Sheet

View the official SDS document for this product directly on the CDMS label database.

📄 View SDS on CDMS → 🏛 Search EPA Label Database →
Glyphosate Herbicide Safety Data Sheet page 1
📄 Glyphosate Herbicide — Safety Data Sheet · View the complete SDS document above or download below
📄 CDMS Label & SDS Database 📄 EPA Label Search
Did you know? Glyphosate was first synthesized in 1950 by a Swiss chemist but its herbicidal properties were not discovered until 1970 by Monsanto scientist John Franz. It has been applied to more acres of farmland than any other pesticide in history. Over 250 million pounds are used annually in the US alone.
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Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional. Last reviewed: April 2026.
📚 Sources: EPA Pesticide Labels · NPIC Pesticide Info
Published: Jan 1, 2025 · Updated: Apr 7, 2026

Application equipment that improves consistency

Better application equipment improves results more than better product. A one-gallon pump sprayer with adjustable nozzle ($30-50) outperforms hose-end sprayers for residual product application because it delivers consistent dilution. A hand duster ($15-25) is the only effective way to apply dust to wall voids, cracks, and crevices — pre-bottled dust products typically deliver inconsistent coverage. A foam machine adapter is useful for treating wall voids where dust would be inappropriate. Measuring cups and a measuring syringe ensure correct dilution at the label rate. A respirator (organic vapor cartridge) is required for some products and reasonable insurance for others. Equipment investments pay back across many treatments and are usually the missing element when product application produces inconsistent results.

When to escalate from DIY to professional

DIY pest control is appropriate for most common household pests when caught early and treated correctly. Escalation to a licensed professional makes sense in specific situations, not just when frustration builds. Wall-void and structural infestations — termites, carpenter ants, rodents nesting inside walls — usually require equipment and access homeowners don't have. Bedbugs at moderate-to-heavy infestation levels almost always require professional treatment; DIY rarely succeeds past the first few isolated bugs. Multi-unit dwellings (apartments, condos) need building-wide coordination that individual unit treatments can't replicate. Health-sensitive households — anaphylaxis risk to stings, immunocompromised individuals, pregnancy, infants — should default to professional because professionals can use the lowest-toxicity option that solves the problem rather than what's available at retail. The financial break-point is roughly when DIY material costs approach one professional visit; below that, DIY is usually fine.

What's actually in the active ingredient column

Most pesticide products use a small number of active ingredients across many brand names. Pyrethroids (bifenthrin, cypermethrin, deltamethrin, lambda-cyhalothrin, permethrin) are the dominant household residual class — fast-acting, low mammalian toxicity, but increasingly affected by resistance in major pests. Neonicotinoids (imidacloprid, dinotefuran, thiamethoxam) are systemic-leaning and have specific uses for ant baits, termite treatment, and some flea products. Phenylpyrazoles (fipronil) underlie many termite, ant bait, and pet flea products. Insect growth regulators (pyriproxyfen, methoprene, hydroprene, novaluron) interrupt development rather than killing directly and pair well with adulticides. Botanicals (pyrethrum, spinosad) offer rapid knockdown but limited residual. Knowing the active ingredient class lets you rotate products properly and recognize when a 'new product' is really an old active in new packaging.

Storing pesticides safely

Pesticide storage at home should follow specific practices for safety and product integrity. Original containers only — label information must remain attached. Locked storage cabinet or location inaccessible to children and pets. Cool, dry environment (not in unheated garages where temperature swings degrade product, and not in direct sun). Don't store with food, beverages, or personal care items. Don't store near ignition sources for flammable products. Keep an inventory and dispose of products that have exceeded shelf life (most pesticides retain efficacy for several years if stored properly, but separated emulsions, crystallized concentrates, or color-changed products should be discarded). Disposal: check with your local hazardous waste program; most municipalities have collection days or permanent drop-off sites for household pesticide disposal.

How environmental conditions affect treatment efficacy

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.

Pesticide rotation and the resistance management problem

Resistance management — using multiple active ingredients in sequence so that no single mode of action selects for resistant individuals — is standard practice in agricultural and commercial pest control but rarely makes it into residential treatment decisions. The underlying concern is real: chronic use of a single pyrethroid product against bed bugs has produced widespread pyrethroid resistance, with some populations now showing resistance factors of 1000x or more. The same pattern is documented in German cockroach resistance to chlorpyrifos and other historical actives, mosquito resistance to organophosphates in heavy-use regions, and house fly resistance across multiple compound classes. For residential treatment, the practical implication is to avoid using the same active ingredient repeatedly across multiple treatment cycles; rotating between products in different chemical families (e.g., pyrethroid → neonicotinoid → insect growth regulator → carbamate, or whatever subset is appropriate to the target pest) reduces selection pressure and preserves efficacy. The product label specifies the active ingredient family, allowing rotation choices to be made on actual chemistry rather than brand name.

Building a pest control file: documentation that compounds over years

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.

Application timing within the day and weather conditions

Pesticide applications produce significantly different results depending on application timing, and matching application to conditions improves outcomes substantially. For outdoor liquid applications, early morning (after dew has evaporated, before pollinators are active) and late evening (after pollinators have stopped foraging, before evening dew) produce best results: temperatures are moderate, wind is typically lower, and non-target exposure is reduced. Mid-day applications during high temperatures cause volatility losses and faster degradation. For interior treatments, timing depends on the pest: cockroach baiting works at any time but should follow rather than precede cleaning; bed bug treatments need to follow vacuuming and clutter reduction; ant baits work best when active trails are present, which often means specific times of day for specific species. Rain within 4 hours of outdoor liquid application washes off most surface residue except specifically rainfast formulations; checking the next 24-hour forecast before any outdoor treatment is the basic discipline that prevents this loss. Temperatures above 90°F or below 50°F outside the product label's recommended range produce reduced efficacy.

Reduced-risk pesticide selection: a category worth knowing

The EPA's reduced-risk pesticide program identifies active ingredients and formulations that meet specific criteria for lower toxicity to non-target organisms, reduced potential for groundwater contamination, lower likelihood of resistance development, or better compatibility with integrated pest management. Products in this category aren't free of toxicity — they're pesticides, and all pesticides have some toxic profile — but they represent the lower end of the risk distribution within their pest categories. For homeowners who want to use pesticides but are concerned about minimizing exposure and environmental impact, looking for products with reduced-risk actives is a defensible filter. Examples include some of the diamide insecticides, spinosyns, and certain microbial products. The catch is that retail availability lags behind the professional market for many reduced-risk products, and consumer pesticide aisles still skew heavily toward older pyrethroid and carbamate formulations. For homeowners willing to source products from agricultural supply channels or work with a pest control company that uses these products, the option exists; for those buying off the shelf at typical retail, the choices are narrower.

Annual pest control budgets: planning versus reactive spending

Most households treat pest control as an emergency expense rather than a line item, and the resulting spend is almost always higher than what a planned program would have cost. A property that allocates a modest annual budget toward inspections, preventive perimeter work, and one or two scheduled treatments at high-pressure times of year typically spends a fraction of what a comparable property spends on crisis response to a single major infestation. The math is straightforward: a moderate cockroach, rodent, or bed bug job typically costs more than a year of preventive service, and the labor and disruption costs to the household are not trivial either. Building a budget also forces the kind of structured thinking that catches problems early — when a homeowner has already decided to allocate funds, they're more willing to call for an inspection at the first ambiguous sign, rather than waiting until the situation is unambiguous and more expensive. The shift from reactive to planned spending is one of the highest-leverage changes a household can make in this category.

Pesticide drift and the neighbor dimension

Pesticide drift — the off-target movement of applied product through air, water, or runoff — is an under-discussed dimension of residential pesticide use, but it's an increasingly common source of conflict between neighbors and a real factor in the cumulative environmental load of pesticide use. Foliar sprays applied in even light wind drift further than most homeowners expect, particularly with finer droplet sizes. Granular products applied near property lines wash into adjacent properties in significant rainfall. Mosquito fogging can move across multiple properties depending on conditions. The implications are partly legal — drift onto neighboring property without consent has been the basis of successful nuisance claims in some jurisdictions — and partly ethical. Applying products only in low-wind conditions, choosing coarser droplet sizes when possible, using granulars rather than sprays near property lines, and timing applications to avoid imminent rainfall all reduce drift. For homeowners concerned about pesticide exposure from neighbors' applications, the productive conversation is usually about timing and product choice rather than about pesticide use in general, and approaching it that way tends to produce cooperation rather than escalation.