Gel bait is the quietest way to break a cockroach infestation. Instead of knocking down the few insects you can see, a syringe of gel puts a slow-acting insecticide exactly where roaches travel, and the population carries the dose back into the harborage on its own. For July 2026 we pulled together 7 roach gel baits from Combat Max, Maxforce, Rockwell Labs and more, comparing active ingredients, bait matrix quality, applicator design and how each one fits a home rotation plan. Our top pick is the Syngenta Advion Cockroach Gel Bait for its indoxacarb formula and a food matrix that German roaches accept even in kitchens with competing crumbs.
Every product below is a true bait gel that you dispense from a tube or applicator, not a spray, a sealed station or a trap. That distinction matters, because sprays scatter roaches and can contaminate the very cracks you want them feeding in. If you would rather work with a dust in wall voids and under appliances, our guide to the best boric acid products for roaches covers that side of the job, and the two approaches pair well when you keep them physically separated.
Pros
- Indoxacarb works slowly enough to relay through the harborage
- Food matrix stays palatable to glucose-averse German roach strains
- Four tubes cover a whole house with material left for follow-ups
- Fits a standard bait gun for faster multi-room work
- Labeled for indoor and outdoor crack and crevice placement
Cons
- Slower visible knockdown than a fipronil gel in the first 48 hours
- Plunger tips can clog if the cap is left off between rounds
- Higher upfront outlay than a single consumer syringe
Advion is the gel most pest professionals reach for first, and the reason is chemistry rather than marketing. Indoxacarb is a pro-insecticide: it enters the cockroach in a relatively inert form and is converted into its active state by enzymes inside the insect. That conversion buys time, and time is exactly what a bait needs to move a lethal dose from the crack where a roach fed back to the harborage where the nymphs live.
The matrix is the other half of the story. German cockroach populations in many regions carry glucose aversion, an inherited trait that makes sweet baits taste repellent. Advion is built to sidestep that, and buyers consistently report acceptance in kitchens where a supermarket sweet gel sat untouched for weeks. The four-tube pack with plungers and tips is enough material for an entire house with a follow-up round two weeks later.
The weak spots are real but minor. If you are looking for a pile of dead roaches the morning after, fipronil will satisfy you faster. Advion looks like it is doing nothing for a day or two, which tempts people into overapplying or spraying on top of it, both of which hurt results. The tips also dry shut if you store a tube without capping it.
Bottom line: if you buy one roach gel and nothing else, this is the one. It is the most reliable combination of accepted matrix, transfer-friendly chemistry and usable quantity on this list.
- Active ingredient: indoxacarb 0.6 percent
- Class: oxadiazine
- Format: 4 tubes, 30 grams each, with plungers and tips
- Target pests: German, American, brown-banded, Oriental and other major species
- Placement: indoor and outdoor crack and crevice
- Bait gun compatible: yes, standard 30 gram tube
Clean competing food sources first, then place pea-sized dots rather than ribbons. Target the top rear corners inside cabinets, the motor housing gaps of the refrigerator and dishwasher, plumbing penetrations under sinks, and cabinet door hinge recesses.
Plan 30 to 60 placements for a kitchen and bathroom. Check at two weeks and replace any dot that has been eaten down or dried to a hard bead. Never spray a repellent insecticide near an active placement, since roaches will avoid the whole zone.
Cap the tube tightly and store cool and dry between rounds. Keep every dot inside a void or crack that a child or pet cannot reach, and wipe up anything that lands on an open surface.
This is a pesticide, not a harmless paste. Follow the label placement rules, keep the label with the product, and contact a poison control center if anyone ingests any.
Pros
- Dinotefuran gives you a chemistry unrelated to fipronil or indoxacarb
- Matrix designed to differ from Rotation 1 so roaches do not learn it
- Pre-filled reservoirs are clean to load and swap
- EPA reduced risk status for public health use
- Works well as a scheduled follow-up rather than a first response
Cons
- Shares a class with imidacloprid gels, so it does not rotate against Invict Gold
- Harder to find in general retail than consumer brands
- Rotation logic is wasted if you only ever buy one product
Alpine Rotation 2 is not really trying to be your only bait. BASF sells Rotation 1 and Rotation 2 as a deliberate pair, with different actives and, just as importantly, different food attractants, so that a population under sustained pressure never gets a chance to adapt to one flavor profile or one chemistry.
The active here is dinotefuran, a neonicotinoid that carries EPA reduced risk status for public health use. It affects feeding roaches quickly while still allowing enough movement for the insect to return to harborage. Buyers who bring it in after two or three months of indoxacarb generally report that acceptance stays high, which is the entire point of the rotation approach.
The catch is planning. If you buy this as a standalone first purchase you get a competent gel, nothing more, and you pay professional-channel pricing for it. It also shares a chemical class with imidacloprid baits, so pairing it with Invict Gold does nothing for resistance management even though the two products look completely different.
Bottom line: buy this in month three, not month one. As the second chemistry in a maintained rotation it is one of the smartest purchases on this list.
- Active ingredient: dinotefuran 0.5 percent
- Class: neonicotinoid
- Format: 4 pre-filled reservoirs, 30 grams each
- Rotation partner: Alpine Cockroach Gel Bait Rotation 1
- Placement: indoor and outdoor crack and crevice, food handling areas per label
- Manufacturer: BASF
Use this product if you already own a gel and are planning ahead. A workable home schedule is indoxacarb or fipronil for two to three months, Alpine Rotation 2 for the next two to three, then back again.
Skip it if you are treating a one-time kitchen problem and expect to be done in a month. A consumer syringe covers that job for far less.
Reservoirs load into a standard applicator and store cleanly, but heat still degrades the matrix. Keep unopened stock cool and dry, and cap partially used reservoirs.
Follow the crack and crevice restrictions on the label in kitchens. Nothing goes on an exposed food preparation surface.
Pros
- Pyriproxyfen stops surviving nymphs from reaching breeding age
- Abamectin is a third chemical class for rotation planning
- Odorless formula suits occupied kitchens and bathrooms
- Fits standard bait guns for multi-room work
- Forgiving of heavy application because the kill is slow
Cons
- Slowest visible results of the professional gels here
- The IGR benefit only shows over several weeks, not days
- Overkill for a small one-room problem
Vendetta Plus takes a different angle from every other gel here. Alongside abamectin B1, which handles the killing, it carries pyriproxyfen, an insect growth regulator. Nymphs that survive the bait, or that hatch after your treatment, absorb enough IGR that they never develop into reproducing adults. In a population that keeps bouncing back a few weeks after each treatment, that is often the missing piece.
Abamectin itself is slow, and slow is a feature in bait. It tolerates heavy placements without causing the bait shyness that a fast knockdown agent can trigger, and it belongs to a class unrelated to both the fipronil and the neonicotinoid gels, which makes it genuinely useful in a rotation. The formula is odorless, which matters when you are baiting an occupied kitchen.
Patience is required. If you judge this product at day three you will be disappointed, because the whole design assumes weeks. It is also more product than a single bathroom problem needs.
Bottom line: the pick for a stubborn, recurring infestation where adults die but the population never quite disappears.
- Active ingredients: abamectin B1 plus pyriproxyfen
- Class: avermectin plus IGR
- Format: 4 tubes, 30 grams each
- Odor: none reported on label
- Sites: residential, commercial and industrial per label
- Bait gun compatible: yes
Best for anyone who has already knocked adults down once and watched the population return. The IGR component is aimed exactly at that pattern.
Also a good fit for landlords and property managers maintaining several units, where you want one product that covers both kill and reproduction control.
Store capped, cool and dry. Because the material is odorless it is easy to forget where you placed dots, so keep a simple written list of placements for the follow-up round.
Place only in cracks, voids and inaccessible corners. Occupied rooms are fine, exposed food surfaces are not.
Pros
- Easy syringe for a first-time user
- Fipronil delivers visible results within a couple of days
- Widely stocked, so you can start the same day
- Right amount of product for a single room
- Labeled for indoor and outdoor use
Cons
- One syringe runs out quickly in a whole-apartment job
- Lower fipronil concentration than the professional Maxforce gel
- Wide tip makes fine placements harder than a pro plunger
Combat Max gel is the product most people should start with if they have never baited before. It is a fipronil gel in a plain syringe, it is on the shelf at the hardware store, and it does not ask you to think about rotation programs or bait guns. For a kitchen that has picked up a few roaches, that simplicity is worth a lot.
Fipronil at 0.01 percent is slower than the professional 0.05 percent version but still fast by bait standards, so you get the reassurance of visible results within a couple of days. The syringe holds enough for a normal kitchen with some left for a second pass, and the label covers both indoor and outdoor crack and crevice placement.
Limits show up when the problem is bigger than one room. A single syringe disappears fast across a whole apartment, and the tip is wide enough that precise placements in a hinge recess take a steady hand. Serious infestations want a four-tube professional pack.
Bottom line: the best value on this list for a contained problem, and the easiest entry point into baiting done properly.
- Active ingredient: fipronil 0.01 percent
- Class: phenylpyrazole
- Format: single 2.1 ounce ready-to-use syringe
- Residual: up to three months per placement per label
- Placement: indoor and outdoor crack and crevice
- Applicator gun required: no
Wipe down surfaces and put pet bowls away overnight so the bait is the most attractive food available. Lay down pea-sized dots inside cabinet corners, under the sink around pipe entries, and along the underside of the counter lip.
Resist the urge to lay a long ribbon of gel. Many small dots reach more roaches and dry out more slowly than one thick line.
Recap the syringe firmly after each use and store it out of reach and away from heat. Dried gel at the nozzle can be trimmed off before the next round.
Fipronil is toxic to pets if eaten, so every dot belongs somewhere a dog or cat physically cannot get to.
Pros
- Highest fipronil concentration among gels here at 0.05 percent
- Fast enough to drop visible activity within days
- Small placements go a long way, so two tubes stretch further than expected
- Pro tube fits a standard bait gun
- Strong record in commercial kitchens
Cons
- Only two tubes, so whole-house coverage needs a second pack
- Fast kill can leave dead roaches in visible spots
- Shares its class with Combat gel, so the two do not rotate against each other
Maxforce FC Magnum is the gel you buy when speed matters. At 0.05 percent fipronil it carries five times the concentration of the consumer Combat gel, and the practical effect is that a heavily infested kitchen goes quiet noticeably sooner. Commercial kitchens have leaned on it for years for exactly that reason.
Because the dose per gram is high, placements can be genuinely small. Two 33 gram tubes cover far more ground than the tube count suggests, provided you are disciplined about dot size. It also transfers well, so roaches that never touched a placement still pick up a dose in the harborage.
The trade-offs follow from the speed. Faster kill means more insects die where you can see them rather than deep in a void, which some people find worse than the infestation itself. And since it is a phenylpyrazole like Combat gel, owning both gives you no rotation benefit at all.
Bottom line: the right call when you need the count down before an inspection, a guest or a move-in date, and a poor choice as the only product in a long-term plan.
- Active ingredient: fipronil 0.05 percent
- Class: phenylpyrazole
- Format: 2 tubes, 33 grams each
- Target pests: German, American, brown-banded and Oriental cockroaches
- Placement: indoor crack and crevice per label
- Bait gun compatible: yes
Use small dots and more of them. With a concentration this high, oversized placements waste product without speeding anything up.
Expect to sweep up dead insects for the first several days. That is the chemistry working, not a sign of overapplication.
Cap tubes between rounds and keep them away from heat sources such as the top of a refrigerator.
Indoor crack and crevice placement only per label. Keep dots out of reach of pets, which are sensitive to fipronil.
Pros
- Matrix uses ten attractants to counter bait aversion
- Imidacloprid at 2.15 percent is a strong dose for resistant populations
- Four 35 gram tubes, the largest tubes on this list
- Good option after a sweet gel has been ignored
- Fits standard bait guns
Cons
- Same neonicotinoid class as Alpine, so they do not rotate against each other
- Slightly stickier to dispense in cold rooms
- Professional channel product, less familiar at retail
Invict Gold exists mainly to solve one problem: a population that will not eat. Rockwell Labs built the matrix around a spread of attractants rather than a single sweet profile, so a colony carrying glucose aversion still finds something worth feeding on. In practice it is the bait people reach for after their first choice sat untouched for a week.
The active is imidacloprid at 2.15 percent, a comparatively high loading, and the tubes are the biggest here at 35 grams each. Four of them is a serious quantity of bait, enough for a large house or a landlord maintaining multiple units, and the tubes take a standard gun.
Two caveats. Imidacloprid is a neonicotinoid, the same class as the dinotefuran in Alpine Rotation 2, so buying both does not give you a rotation. And the gel is a little stiffer than Advion when the room is cold, which makes fine dots slower to place.
Bottom line: the strongest answer on this list to bait refusal, and a sensible second chemistry as long as your rotation partner is not another neonicotinoid.
- Active ingredient: imidacloprid 2.15 percent
- Class: neonicotinoid
- Format: 4 tubes, 35 grams each
- Matrix: multi-attractant, formulated against bait aversion
- Placement: indoor and outdoor crack and crevice per label
- Manufacturer: Rockwell Labs
For anyone whose first gel was ignored, and for regions where glucose-averse German cockroach strains are common.
Also a strong buy for large properties, since 35 gram tubes in a four pack cover a lot of placements.
Warm the tube to room temperature before placing dots in a cold basement or garage so the gel flows evenly.
Standard bait discipline applies: cracks, voids and inaccessible corners only, never an exposed food surface.
Pros
- Bottle applicator is comfortable for long crack runs
- Abamectin gives a third chemical class for rotation
- Generous volume for the format
- Widely available at general retail
- Slow kill tolerates heavy placement without bait shyness
Cons
- Squeeze bottle offers less precise metering than a plunger tube
- Lowest rating of the group among verified buyers
- Slower to show results than either fipronil gel
TERRO takes the professional abamectin chemistry and puts it in a format aimed at homeowners: a squeeze bottle with a fine tip instead of a plunger tube. For running a line of small dots along a baseboard, behind a toilet or down the seam beside a basement stairway, that bottle is genuinely more comfortable than a pro tube.
Abamectin B1 at 0.05 percent is slow, which is exactly what you want from a bait. Roaches feed, wander home and die there, and nymphs pick up the dose from droppings and carcasses. It also puts a third chemical class on the table for anyone rotating away from fipronil and the neonicotinoids.
The bottle is the weak point as well as the strength. Metering by squeeze pressure is less consistent than a threaded plunger, so dot size drifts, and it is easy to lay down more gel than a placement needs. Buyer ratings sit a little below the professional tubes here, and impatience with the slow kill is a recurring theme in that feedback.
Bottom line: the most comfortable applicator for long crack runs, and a solid rotation partner, provided you accept that results build over weeks.
- Active ingredient: abamectin B1 0.05 percent
- Class: avermectin
- Format: 3 ounce bottle with precision applicator tip
- Target pests: German, American and Oriental cockroaches
- Sites: kitchens, bathrooms, basements per label
- Applicator gun required: no
Squeeze with steady, light pressure and lift the tip between dots so the gel breaks cleanly. Aim for a series of small placements along the run rather than a continuous bead.
Because abamectin is slow, do not judge the placement at day two. Check at two weeks, refresh what has been eaten, and keep sprays out of the area entirely.
Wipe the tip and recap after use so the nozzle does not harden shut. Store upright, cool and dry.
Keep dots behind and under fixtures where children and pets cannot reach them, and follow the label restrictions for food preparation areas.
How to Choose the Right Roach Gel Baits
Gel baits look interchangeable on the shelf. A 30 gram tube of brown paste is a 30 gram tube of brown paste. What separates a product that clears a kitchen in three weeks from one that sits untouched behind the toaster comes down to four things: the active ingredient, the food matrix carrying it, the applicator you use to place it, and whether the label allows the placements you actually need. The criteria below are the ones that changed our ranking.
Active Ingredient and Speed of Kill
Five chemistries dominate consumer and professional roach gels. Indoxacarb, used in Advion, is a pro-insecticide: the roach metabolizes it into its active form after eating, which delays mortality just long enough for the insect to return to the harborage. Fipronil, used in Maxforce FC Magnum at 0.05 percent and in Combat Max gel at 0.01 percent, is a fast phenylpyrazole that works well when you need visible knockdown in a few days. Imidacloprid, the neonicotinoid in Invict Gold, and dinotefuran, the neonicotinoid in Alpine Rotation 2, sit in the middle. Abamectin B1, used in Vendetta Plus and in TERRO Cockroach Gel Bait, is a slow avermectin that is very forgiving of a heavy application.
Slow is usually better. A bait that kills a roach in an hour kills only the roach that ate it. A bait that takes a day or two lets that insect carry the dose home, defecate in the harborage and die where nymphs will feed on the carcass and the droppings. That relay is the reason gel outperforms contact insecticide on German cockroach populations, and it is why none of these products should be judged on how many dead roaches you see the first morning.
One practical note: none of these actives is a guaranteed cure. A heavy infestation in a multi-unit building can be reinfested from a neighboring wall no matter how well you bait your own kitchen. Treat gel as population control that you maintain, not a single event.
Bait Matrix and Roach Acceptance
The insecticide is a fraction of a percent of the tube. The other 99 percent is food, and that is what decides whether roaches eat. German cockroaches in some regions have developed glucose aversion, an inherited behavior where sweet baits taste bitter to them, and a colony with that trait will walk over a sugar-heavy gel for weeks. Manufacturers respond by building matrices around protein, fat and non-glucose carbohydrates. Advion, Invict Gold and the Alpine rotation baits all use matrices designed with aversion in mind.
If your first bait gets ignored after several days of untouched placements, the answer is almost never more of the same bait. Switch to a product with a different matrix and a different active. That is the whole logic behind Alpine selling Rotation 1 and Rotation 2 as separate products with deliberately different food attractants.
Applicator Design and Placement Control
Good baiting is dozens of pea-sized dots, not three fat ribbons. That means the applicator matters more than most buyers expect. Professional tubes with a threaded plunger, such as Advion, Vendetta Plus, Maxforce and Invict Gold, give you fine control and accept a standard bait gun if you plan to treat several rooms. Consumer syringes such as Combat Max and the TERRO bottle applicator are easier to grip for a one-off kitchen job but waste more gel when your hand slips.
Tip diameter is worth checking too. A narrow tip reaches into the hinge gap behind a cabinet door, the seam under a dishwasher and the gap where a countertop meets a backsplash, which are the placements that actually matter. A wide tip pushes you toward surface placements where gel dries out fast and where children and pets can reach it.
Label, Placement Rules and Household Safety
Every product here is legal for residential use, but the labels differ. Some are cleared for indoor and outdoor crack and crevice work, some are restricted to indoor use, and all of them prohibit application to exposed surfaces where food is prepared. Read the placement section before you open the tube, and keep the label with the product. Retailers that carry these tubes also stock the applicator guns and tips you may want, and you can browse the wider patio, lawn and garden category for the rest of the pest control shelf.
On safety: gel baits are far lower risk than aerosols in a home with children or pets, because the material stays in cracks rather than becoming airborne. That is a relative statement, not a promise. A dog that licks an accessible dot can still get sick, and no gel on this list is labeled as pet safe in the sense of being harmless if eaten. Place gel inside voids, under appliances, behind escutcheon plates and inside cabinet corners where nothing can reach it, and wipe up any dot that ends up on an open surface. Cleaning products and personal protective gloves live in the health and household aisle if you want to glove up first.
Resistance and Rotation Planning
German cockroaches reproduce fast enough that resistance to a single active can build within a few generations of continuous pressure. The standard professional answer is to rotate: use one chemistry for two to three months, then switch to an unrelated class. Fipronil and indoxacarb are unrelated. Imidacloprid and dinotefuran are both neonicotinoids, so treat them as one class when you plan your rotation. Abamectin is a third class again. Buying two tubes from different columns of the table below is cheaper than fighting a resistant population later.
| Product | Active ingredient | Class | Applicator | Best use |
|---|---|---|---|---|
| Syngenta Advion | Indoxacarb 0.6% | Oxadiazine | Pro tube, plunger | First line, heavy German roach pressure |
| BASF Alpine Rotation 2 | Dinotefuran 0.5% | Neonicotinoid | Pre-filled reservoir | Second chemistry in a rotation plan |
| MGK Vendetta Plus | Abamectin B1 plus pyriproxyfen | Avermectin plus IGR | Pro tube, bait gun ready | Breaking the breeding cycle |
| Combat Max Gel | Fipronil 0.01% | Phenylpyrazole | Consumer syringe | Small kitchen or bathroom job |
| Maxforce FC Magnum | Fipronil 0.05% | Phenylpyrazole | Pro tube, plunger | Fast knockdown on a visible population |
| Invict Gold | Imidacloprid 2.15% | Neonicotinoid | Pro tube, plunger | Glucose-averse colonies |
| TERRO Cockroach Gel Bait | Abamectin B1 0.05% | Avermectin | Bottle, precision tip | Long crack runs and baseboards |
Coverage, Tube Count and What You Actually Need
A typical apartment kitchen and bathroom together take somewhere between 30 and 60 placements on the first round, each about the size of a pea. One 30 gram tube covers that comfortably with material left for a follow-up in two weeks. A four-tube pack is the right buy for a whole house, for a rental you maintain, or for anyone who expects to rotate chemistries across a season.
Shelf life is the other half of the math. Unopened tubes generally stay good for a couple of years in a cool, dry place, but an opened tube with a used tip dries at the nozzle and should be capped tightly and stored away from heat. Buying a six-pack because the unit cost looks better is false economy if half of it hardens before you use it.
Why You Should Trust Us
We built this shortlist from product labels, EPA registration data and manufacturer technical sheets, cross-checked against what verified buyers report about bait acceptance, applicator quality and dry-out. Every entry had to be a genuine gel bait sold in a tube or applicator bottle, had to carry a clearly identified active ingredient, and had to hold a strong rating across a meaningful number of real customer ratings. Sprays, sealed bait stations, glue traps and dusts were excluded on purpose, because mixing categories in a single ranking hides the trade-offs that matter within gels.
We do not accept payment for placement, and we do not claim to have run controlled field trials in our own homes. What we can do is read the chemistry honestly, flag where a product is a repackaged professional formula, and tell you when two tubes on the same shelf share an active ingredient and therefore do nothing for your rotation plan.
Final Thoughts
The Syngenta Advion Cockroach Gel Bait is our best overall pick. The indoxacarb chemistry hits the sweet spot between slow enough to relay through a harborage and fast enough that you see progress inside a week, the matrix is accepted by aversion-prone German roach strains, and the four-tube pack covers a whole house with material to spare. If you buy one product and nothing else, buy this one and place it properly.
The Combat Max Roach Killing Gel is our best value pick. It is the easiest of these to find in a hardware aisle, the syringe is friendly to someone who has never baited before, and the fipronil dose is plenty for a single kitchen or a bathroom that picked up a few hitchhikers. For a whole apartment under real pressure it runs out fast, but as a first response it does the job for a fraction of the outlay of a professional four-pack.
For specific situations: MGK Vendetta Plus is the pick when you want an insect growth regulator working alongside the kill, because pyriproxyfen keeps surviving nymphs from reaching breeding age. Invict Gold earns its place when a sweet-matrix bait has already been ignored. BASF Alpine Rotation 2 is what you buy in month three so the population never settles into one chemistry, and Maxforce FC Magnum is the choice when a landlord or a guest is arriving and you need the count down quickly. TERRO is the friendliest applicator for long baseboard runs. Whatever you pick, keep sprays away from your bait placements, and read the rest of our home and outdoor buying guides in the articles archive before your next project.
Frequently Asked Questions
How long does roach gel baits take to work in 2026?
Expect dead roaches within 24 to 72 hours of the first feeding, and a visible drop in activity within one to two weeks. Full population collapse in a moderate infestation usually takes three to six weeks, because you are waiting for eggs already in oothecae to hatch and for those nymphs to feed. If you see nothing at all after ten days, the problem is placement or bait acceptance, not patience.
Where should I place gel bait dots?
Put small dots at the top rear corners inside cabinets, under and behind the refrigerator and dishwasher, along the underside of countertop lips, inside the motor housing gap of appliances, around plumbing penetrations under sinks, and in the hinge recesses of cabinet doors. Roaches travel along edges and vertical corners, not across open floors, so a dot in the middle of a shelf is wasted. Aim for many small placements rather than a few large ones.
Is gel bait safe around children and pets?
Gel bait is lower risk than aerosol insecticide because nothing becomes airborne, but it is still a pesticide and none of these products is harmless if swallowed. Place every dot inside a void, a crack or a location a child or a dog physically cannot reach, follow the label, and call a poison control center if anyone ingests any. Households wanting the lowest-exposure option can look at the mineral approach covered in our boric acid guide, applied in wall voids only.
Why do roaches ignore my gel bait?
Three common reasons. First, glucose aversion: some German cockroach populations refuse sweet matrices, so switch to a protein-forward bait with a different active. Second, competing food: crumbs, pet bowls left out overnight and grease behind the stove all beat a bait dot, so clean before you bait. Third, contamination: if you sprayed a repellent insecticide near the placement, roaches will avoid the whole area. Never combine a spray with gel in the same zone.
How often should I reapply?
Check placements at two weeks. Replace any dot that has been eaten down or that has dried to a hard bead, since dried gel loses palatability even though the insecticide is still present. In an active infestation plan on two or three rounds over six weeks, then a maintenance placement every two to three months in entry points. Rotate to an unrelated chemistry rather than reapplying the same active indefinitely, and browse the wider product categories if you also need traps or monitors to track your progress.
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