Reviewed by William "Willy" Vizcarrondo, NYS DEC Certified Commercial Pesticide Applicator C1825832. Updated September 23, 2026.
Short answer
No. UC IPM's guidance is to avoid foggers, bombs and aerosol sprays for cockroaches, because they can be hazardous and may repel and disperse cockroaches to other areas, and the University of Florida's extension calls fogging generally ineffective. The fog never reaches the cracks where roaches live, and it spreads them into rooms that didn't have them.
Because roaches aren't in the air. UF IFAS notes German cockroaches spend most of their lives in cracks and crevices near food and water: behind the stove, inside cabinet hinges and drawer slides, under the sink, in the dishwasher insulation and the wall void behind it. A fogger fills the open air of a room with a fine mist that settles on counters, floors and dishes, and very little of it gets into a hinge or a wall. What the roaches do notice is the repellent effect, and UC IPM's warning is that foggers and aerosol sprays may repel and disperse cockroaches to other areas, which is how a kitchen problem becomes a kitchen, bathroom and bedroom problem.
Because roaches won't eat bait that smells like spray. Gel bait is the tool that works, and UF IFAS lists baiting, insect growth regulators and HEPA vacuuming as the most effective options. But UF IFAS also notes that residual sprays can contaminate bait placements, making the bait repellent so cockroaches will not consume it. A homeowner who fogs the kitchen and then puts out bait, or a kitchen that gets both from two different people, ends up with bait the roaches avoid. There's a resistance problem too: UF IFAS notes that where resistance genes are already present in more than 1 percent of a population, product efficacy can decline noticeably within one generation, and German cockroaches produce 3 to 6 generations a year.
Bait in the harborages, sanitation, and patience. Gel bait goes in small dots exactly where the roaches live, so they eat it and carry it back to the others; UC IPM notes baits don't give immediate results but offer long-term effectiveness, and it may take 7 days or longer before you see fewer cockroaches. Sticky monitors at the wall-floor junction tell you where the activity is and whether it's dropping. Sanitation, sealed food, a dry sink and no clutter or cardboard, makes the bait the best meal available. A HEPA vacuum removes live roaches, egg cases and the allergen-laden debris in a heavy harborage. And then a follow-up, because the egg cases that were already laid still hatch.
The fogger call is one we get every week from Hempstead, Freeport, Long Beach and the Queens neighborhoods: someone set off two cans in the kitchen and now there are roaches in the bathroom and the kids' room. Bobby Bugs treats German cockroaches with gel bait and growth regulator in the harborages, no fogging, no broadcast spraying, and comes back to check the monitors. The work carries a 60-day written guarantee.
Related
Gel baits and bait stations can work on a light infestation if you put them where the roaches actually are and don't spray anything near them. Most people put them along the counter where they saw a roach instead of in the hinge and behind the stove where the roaches live, and they give up after three days. UC IPM's timeline is a week or longer.
Usually a few weeks for a kitchen infestation, with fewer roaches within the first week or two and follow-up to catch the egg cases that hatch after the first treatment. Heavy infestations in apartment buildings take longer because the source next door keeps supplying them.
With gel bait, yes. It goes in cracks and hinges and behind appliances in spots you and your pets don't touch, and there's no fog or spray in the air. We'll tell you exactly where every placement is.
Still not sure? Call (516) 509-6001 and we'll tell you what you're dealing with.