How and where should bedbugs be sprayed? - briefly
Apply an EPA‑registered residual spray in a fine mist to seams, cracks, and crevices of mattresses, box springs, bed frames, furniture, and baseboards, focusing on hiding spots. Treat the entire infested room before occupants return, following label directions for dosage and safety precautions.
How and where should bedbugs be sprayed? - in detail
Effective control of Cimex lectularius requires precise selection of insecticide formulation and thorough coverage of all infestation sites. Use a registered residual spray formulated for indoor use, preferably a pyrethroid‑based product with proven knock‑down and lasting activity, or a neonicotinoid‑pyrethroid blend where resistance is documented. For households with known resistance, opt for a silica‑based aerosol or a desiccant dust such as diatomaceous earth applied to voids.
Preparation steps:
- Remove all bedding, wash at ≥ 60 °C, and dry on high heat.
- Vacuum mattress surfaces, upholstery, and floor edges; discard the vacuum bag immediately.
- Seal cracks, crevices, and baseboard gaps with caulk where feasible to reduce harborages.
Application zones:
- Mattress and box‑spring seams, tufts, and tags; spray until a fine mist coats the fabric without saturation.
- Bed frame joints, headboard, footboard, and any wooden or metal components.
- Upholstered furniture, focusing on cushions, folds, and under‑seat areas.
- Floor‑board seams, carpet edges, and under‑furniture spaces; use a nozzle that delivers a thin, even layer.
- Wall baseboards, outlet boxes, and behind picture frames; treat the perimeter of the room up to 12 inches from the floor.
- Cracks in walls, window frames, and door frames; insert the tip of the spray can into the opening for direct deposition.
Safety measures:
- Wear nitrile gloves, a NIOSH‑approved respirator (filter rating P100), and eye protection.
- Ensure adequate ventilation: open windows and run exhaust fans for at least 30 minutes after spraying.
- Keep children, pets, and food items out of the treated area until the label‑specified re‑entry interval, typically 2–4 hours.
Post‑treatment protocol:
- Re‑vacuum treated surfaces after the drying period to remove excess residue.
- Install interceptors under each leg of the bed and furniture; monitor weekly.
- Repeat the spray after 7–10 days to target newly emerged nymphs, following the same coverage pattern.
- Consider integrating heat treatment (≥ 50 °C for 90 minutes) or steam applications on items that cannot be sprayed, such as electronics and delicate fabrics.
By adhering to these procedures, the insecticide reaches every potential refuge, maximizes mortality, and reduces the likelihood of resurgence. Regular inspection and prompt retreat when live insects are detected sustain long‑term eradication.