Methods drawer
Baits — and why spray ruins them
A bait works because the pest eats it and shares it. Anything that makes the pest avoid the food, or kills it before it gets home, defeats the design.
Gel baits for German cockroaches and sugar baits for ants are the most important advance in household pest control in a generation. The forager eats, returns, and shares — by feeding nestmates, by contact, and through the colony's ordinary recycling — so the active ingredient reaches the queen and the young that no spray could touch. This only works if the bait stays the most attractive food in the room and the foragers stay alive long enough to deliver it.
Why spraying over bait ruins it
- Most household sprays are repellent: roaches and ants detect the residue and avoid the treated zone — including the bait placed in it.
- Contact spray kills the foragers you need as delivery vehicles, at the surface, before the dose reaches the nest.
- Overspray contaminates bait placements directly, and foggers scatter the colony into walls and adjoining rooms where bait is not.
The discipline is simple: bait, then leave it alone. Place many small points in the harborages, remove competing food and water, do not spray the same surfaces, and judge the result in weeks, not days — a bait program that is working looks worse before it looks better, as dying colonies forage erratically.
Safety
Baits are pesticides: place them in cracks and voids out of reach of children and pets, keep the product label, and never decant bait into food containers. Rodent baits are a different and riskier class — see the trapping and DIY pages before considering them at all.