How do I mix and apply Demand CS correctly?

Measure the concentrate to the exact rate printed on your label — never eyeball it — then add it to a partly filled tank, top with water, and agitate thoroughly so the microcapsules stay suspended. Apply as a coarse, low-pressure, continuous band to targeted surfaces, harborage, cracks, and entry points rather than broadcasting it like a lawn spray. Re-agitate the tank if you pause, since settled capsules deliver progressively weaker coverage as you work through the job, and that uneven deposit is the single biggest reason a professional concentrate underperforms in the field.

Does Demand CS actually work?

Yes, and the microencapsulation genuinely earns its pro-grade reputation — independent field testing found knockdown held near 100% on wood surfaces for 26 weeks, well past what a plain retail spray typically manages, before declining on concrete and mud surfaces starting around week 11 to 20. Mixed to the correct rate and applied as an even, continuous band, it's a real workhorse for durable residual control. What it does not do is deliver instant knockdown — the label says so directly — or reach a colony or nest, so judge it on sustained suppression over days and weeks, not on what you see minutes after spraying.

Why do I still see bugs after applying Demand CS?

A residual band kills insects that contact the treated surface, but that process takes hours to a couple of days, not seconds, so seeing activity right after application doesn't mean it failed. If insects persist well past that window despite an accurately mixed, continuous application, the likely explanation is either an untreated interior source, a colony or nest the surface band structurally can't reach, or — for cockroaches specifically — pyrethroid resistance, which is well documented in German cockroach populations. Persistent activity after correct application is a signal to add baiting or dusting, or to call a licensed technician, not to spray more.

Why does the dilution matter so much with this product?

Because the entire performance advantage of a microencapsulated concentrate depends on getting the concentration right. Too weak, and you don't get a real residual barrier at all; too strong, and you waste product, risk runoff and aquatic toxicity, and violate the label. This is precisely why the technique here is rated moderate rather than easy — the mixing accuracy, not the spraying itself, is what separates a professional-grade result from a disappointing one.

How long does the residual actually last?

It depends heavily on the surface. Independent testing on a comparable microencapsulated lambda-cyhalothrin product found knockdown remained near 100% on wood for the full 26-week trial, but declined on concrete starting around 11 weeks (down to about 83%) and shifted again by 20 weeks (about 88%), underscoring how surface-dependent the results are. Treat porous, high-exposure exterior surfaces as needing more frequent reapplication than smooth or wood surfaces, and always follow your label's stated interval rather than a fixed calendar date.

Is it safe to use around my pets?

The practical precaution is keeping pets and kids off any treated surface until it's completely dry, since that's when exposure risk is highest. Lambda-cyhalothrin is also extremely toxic to fish and aquatic invertebrates, so keep it well away from ponds, aquariums, and storm drains during mixing and application. For the full per-species pet-safety verdict on this specific product, see our companion review at /is-pest-control-safe-for-pets/demand-cs-insecticide-concentrate-by-syngenta.

Daniel Brady · NH-Licensed Pesticide Applicator · License #782664

How to Use Demand CS Insecticide Concentrate by Syngenta

Workhorse

Lambda-cyhalothrin 9.7%

Used correctly, Demand CS is a pro-grade workhorse — but success depends entirely on mixing accuracy, not brand reputation. It's a lambda-cyhalothrin 9.7% microencapsulated concentrate you dilute to the exact label rate, agitate to keep the capsules suspended, and apply as a coarse, low-pressure, continuous band to targeted surfaces and harborage. The microcapsules resist UV and chemical breakdown and are picked up on insects' legs, which is why independent testing found it held near 100% knockdown on wood for 26 weeks — genuinely longer than a plain retail spray, especially on porous surfaces like brick and concrete. What it does not do is deliver instant kill (the label says so directly) or reach a colony or nest; it kills foragers and exposed insects, not the reproductive core behind them. Guess the dilution or let the capsules settle in the tank and you lose most of that advantage.

At a glance

Efficacy: Workhorse
Best job: Laying a durable residual band, especially on porous exterior surfaces (brick, block, concrete), that outlasts a plain retail spray
Format: Professional dilutable concentrate (capsule suspension/CS, microencapsulated) — mix-your-own, not ready-to-use; typically diluted in a gallon of water at the label rate
Technique: Moderate technique

The honest verdict

Does this product actually work?

The verdict on this product

WorkhorseModerate technique

Workhorse

A genuine pro-grade workhorse for durable residual — mixed right, it outlasts retail sprays on porous surfaces, but it still won't reach a colony.

Demand CS's microencapsulation is a real, independently documented advantage on porous surfaces — Etang et al. (2011) found knockdown held near 100% on wood through 26 weeks, holding up far better than a plain spray before declining on concrete and mud. But it's still a residual barrier, not a colony treatment: it kills foragers and exposed insects on contact over hours to days, not the nest behind them, and the label itself says it doesn't deliver instant knockdown. Mixed accurately and applied as a coarse, continuous band, it's a genuine workhorse; guessed at, it underperforms both retail sprays and its own reputation.

Best for

Durable exterior and interior residual bands, especially on porous surfaces like brick, block, and weathered concrete, when mixed to the exact label rate.

Skip it for

Expecting instant kill, or treating a nest or colony that needs baiting or dusting instead of a surface band.

Read the label first

What it is — and what it's really for

The label is the law. Here's the honest read on the format, the one job it does well, and the job people wrongly buy it for.

Format

Professional dilutable concentrate (capsule suspension/CS, microencapsulated) — mix-your-own, not ready-to-use; typically diluted in a gallon of water at the label rate

Indoor / outdoor

both

Residual

Independent field data on CS lambda-cyhalothrin found knockdown held near 100% on wood for 26 weeks but declined on concrete/mud around weeks 11-20 — genuinely longer than a retail EC spray, but surface-dependent, not indefinite

Target pests

Ants, Cockroaches, Spiders, Fleas, Ticks, Boxelder bugs, Centipedes, Millipedes, and a broad structural pest list

Best job

Laying a durable residual band, especially on porous exterior surfaces (brick, block, concrete), that outlasts a plain retail spray

Active ingredient

Lambda-cyhalothrin (9.7%)

Not for (honest)

Instant knockdown — the label itself notes it does not provide instant knockdown — or reaching a colony or nest

The technician's method

The technique walkthrough

Where DIY succeeds or fails is in the placement, patience, and the small pro moves the label never mentions. Follow the label; these are the technique details on top of it.

Moderate technique~45-90 min for an average house; contact kill over hours to a couple of days, residual holds for weeks to months depending on surfaceTools:Pump/backpack sprayer, Measuring device, Gloves, Eye protection

This is a moderate-difficulty product precisely because the whole advantage lives in getting the dilution and agitation right — sloppy mixing turns a pro-grade concentrate into an underperforming spray.

Measure precisely
Measure the concentrate to the exact label rate — don't eyeball it. Under-dosing leaves no real barrier; over-dosing wastes product, risks runoff, and violates the label.
Common mistake
Eyeballing the dilution 'to be safe' — guessing the mix is the single most common way DIYers ruin a professional concentrate.
Mix and agitate
Add product to a partly filled tank, then top with water, and agitate thoroughly to suspend the capsules before you start spraying.
Pro move
If tank-mixing with an IGR or another product, add Demand CS last and re-agitate periodically through the job.
Apply a coarse, targeted band
Apply a coarse, low-pressure, continuous band to targeted surfaces and harborage — foundation, entry points, cracks and crevices — not a broadcast fog over open areas.
Pro move
Prioritize porous exterior surfaces (brick, block, weathered concrete) — that's exactly where the CS microcapsules outperform a cheaper spray.
Keep it agitated through the job
Re-agitate the tank if you pause for more than a few minutes — the capsules settle, and an unagitated tank delivers a weaker mix toward the end of the job.
Common mistake
Spraying the last gallon straight from a settled tank — coverage becomes uneven exactly where you finish.
Respect reapplication limits
Observe the label's reapplication interval and any annual/area application limits; don't reapply reactively just because you saw a bug.
Caution
Keep it out of storm drains and water — lambda-cyhalothrin is extremely toxic to fish and aquatic invertebrates.

Habits that decide it

Do & don't

Measure to the label rate every time
Keep the mix agitated so capsules stay suspended
Apply as a targeted coarse band, not a broadcast fog
Prioritize porous exterior surfaces where it outperforms retail sprays
Respect the label's application limits

Don't

Don't over-concentrate 'for good measure'
Don't broadcast beyond labeled sites
Don't let it enter drains or water
Don't expect instant knockdown
Don't let the tank sit unagitated mid-job

The honesty moat

Where it works vs. where it fails

No product fixes everything. This is the honest boundary — the situations it genuinely handles, and the ones it simply won't.

Where it works

You need a durable residual band on porous exterior surfaces like brick, block, or concrete
The mix is measured accurately and kept agitated throughout application
You're treating harborage and entry points as a targeted band, not broadcasting
You need longer residual life than a retail RTU spray typically offers

Where it fails

You need instant, same-day knockdown of visible insects — the label itself says it doesn't provide that
There's a colony or nest the surface band can't reach
German cockroaches with documented pyrethroid resistance are the target
The dilution was guessed rather than measured, or the tank went unagitated

Don't throw money away

Mistakes that waste the product

Eyeballing the dilution

Guessing wastes the product's entire advantage — too weak underperforms, too strong wastes money and risks a label violation and runoff.

Fix

Measure to the exact label rate every time, using a proper measuring device.

Letting the capsules settle

An unagitated tank delivers progressively weaker, uneven coverage as you work through the job.

Fix

Agitate before starting and re-agitate periodically, especially after any pause.

Fine misting instead of a coarse band

A fine mist drifts instead of depositing where insects actually walk, wasting product and leaving poor pickup.

Fix

Use a coarse, low-pressure band on targeted surfaces and harborage.

Treating it as a knockdown spray

The label itself notes no instant knockdown — expecting visible dead insects immediately leads to disappointment and over-application.

Fix

Pair it with an aerosol or bait for insects you need dead today; let Demand CS do the residual job.

Broadcasting over open areas

This is a targeted structural and harborage product, not a lawn spray — broadcasting wastes product and can be off-label.

Fix

Confine application to the foundation band, entry points, cracks, and labeled spot treatments.

Calibrated expectations

What to expect — and when

This is a residual tool with a delayed kill and a genuinely long tail — judge it on sustained suppression, not on what you see in the first hour.

Hours to 1-2 days
Insects that pick up the capsules on treated surfaces die — not instantly, but reliably, as the label's 'no instant knockdown' note implies.
Days 3-14
New activity on treated surfaces drops noticeably as the residual band does its job.
Weeks to months (surface-dependent)
Independent testing found near-total knockdown held on wood through 26 weeks, while concrete/mud surfaces declined starting around week 11-20 — reapply sooner on porous, high-exposure surfaces.

When results plateau

Results plateau against an untreated interior source, a colony or nest the band never reaches, or resistant German roaches — the residual keeps suppressing exposed insects, it doesn't cure what's living inside the structure.

Know the ceiling

When to stop DIY & call a pro

Demand CS is genuinely pro-grade, and several of its uses are label-restricted to commercial applicators. These are the signals the job belongs to a licensed technician:

You're unsure of the correct dilution or use site for your specific pest problem
Mixing and coverage errors waste a professional concentrate and can violate the label — accuracy is the entire advantage, and it's easy to get wrong without training.
Cockroaches persist despite correctly mixed, evenly applied treatment
German cockroaches carry widespread pyrethroid resistance; a residual band alone often can't overcome it without baiting or dusting alongside it.
You find carpenter ants, frass, or a suspected nest in structural wood
A surface residual band doesn't reach an in-wall colony — that needs inspection and often void treatment.
You need it applied at a use site the consumer-available formulation doesn't cover
Demand CS's professional label lists commercial use sites that require licensed application.

Anchor's NH-licensed technicians are trained and equipped to mix and apply pro-grade concentrates like Demand CS at the correct rate, on the correct surfaces, and to pair it with baiting or dusting where a residual band alone won't finish the job. Free inspection, same-day service across southern and central New Hampshire.

Mixing accuracy is where DIY usually goes wrong

Get a Free inspection (603) 785-0118

Before you treat

Is it safe for pets & kids?

The short version lives here; the full per-species verdict lives on this product's pet-safety page.

Lambda-cyhalothrin is a pyrethroid and is extremely toxic to fish and aquatic invertebrates, so keep it well away from storm drains, ponds, and standing water during mixing and application. Around pets and kids, the practical precaution is staying off the treated area until it's fully dry.

Re-entry: Keep children and pets off treated surfaces until the application is fully dry.

If there's an exposure, call

ASPCA Animal Poison Control: (888) 426-4435 Pet Poison Helpline: (855) 764-7661 Northern New England Poison Center: (1-800) 222-1222

See the full per-species pet-safety verdict for this product

New Hampshire context

Pro-grade residual across New Hampshire's seasons

Southern and central New Hampshire's ant and occasional-invader pressure builds through the warm months and again at fall ingress, and a microencapsulated concentrate's longer hold on porous exterior surfaces like brick and concrete genuinely pays off across that stretch. Because several of its uses are professional-label only, Anchor Pest Services applies Demand CS at the correct rate and site across Manchester, Nashua, Concord, and the surrounding towns rather than homeowners sourcing and mixing it themselves.

Service area

Southern New Hampshire

Anchor Pest Services · NH license #782664 · NEPMA member · family-owned since 2017.

Common questions

Frequently asked

Sources & further reading(3)

[1]
EPA Pesticide Product Label System — Demand CS, Reg. No. 100-1066
Verified active (lambda-cyhalothrin 9.7%), microencapsulated capsule-suspension format, 'no instant knockdown' label language
epa_labelverified 2026-07-14
[2]
Syngenta Professional Pest Management — Demand CS product/label page
Dilution/mixing directions, use sites, tank-mix guidance (facts only, not the efficacy verdict)
manufacturerverified 2026-07-14
[3]
Etang et al., Malaria Journal (2011) — residual efficacy of microencapsulated lambda-cyhalothrin
Surface-dependent residual: near-100% knockdown on wood through 26 weeks, decline on concrete/mud by weeks 11-20
academicverified 2026-07-14

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

Verify license

Last updated July 2026

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Professional Pest Control

Pro-Grade Products Deserve Pro-Grade Application

Demand CS rewards precision and punishes guesswork. Anchor Pest Services mixes, agitates, and applies it at the correct rate and site across southern and central New Hampshire. Family-owned since 2017, NH license #782664.

Get a Free inspection (603) 785-0118

Accurate, licensed mixing and application
NH-licensed applicators (#782664)
Free inspection — same-day service across southern NH

NH License #782664 · No obligation · We answer in person

Keep Exploring

How to Use Demand CS Insecticide Concentrate by Syngenta

Does this product actually work?

What it is — and what it's really for

The technique walkthrough

Measure precisely

Mix and agitate

Apply a coarse, targeted band

Keep it agitated through the job

Respect reapplication limits