How long does carbofos act against bedbugs? - briefly
«Carbofos» remains effective against bed‑bug populations for roughly two to three weeks, with peak mortality observed during the first ten to fourteen days after application. Efficacy diminishes thereafter as residues break down and insects develop tolerance.
How long does carbofos act against bedbugs? - in detail
Carbofos, an organophosphate insecticide, exerts its lethal effect on Cimex lectularius through acetylcholinesterase inhibition. After a thorough surface treatment, mortality peaks within 24 hours, while residual activity persists for a variable period. Under optimal indoor conditions—temperature 20‑25 °C, relative humidity 50‑70 %—the residual efficacy typically extends 7‑14 days. In warmer, drier environments, degradation accelerates, reducing the effective window to 4‑6 days. Conversely, cooler, humid settings can prolong activity up to 21 days.
Key factors influencing persistence include:
- Dosage: application at the label‑specified rate (0.5‑1 g a.i./m²) maximises residual lifespan; overdosing may increase toxicity without extending control.
- Surface type: porous materials (carpet, untreated wood) absorb the compound, shortening surface availability; non‑porous surfaces (tile, sealed floor) retain the chemical longer.
- Ventilation: high air exchange rates expedite volatilisation, diminishing residual action.
- Photodegradation: exposure to direct sunlight accelerates breakdown; shaded areas maintain efficacy longer.
Re‑treatment recommendations depend on observed reinfestation and residual decline. If live specimens appear after the anticipated residual period, a new application should be scheduled, respecting the pre‑harvest interval of 48 hours and adhering to cumulative exposure limits. Safety data indicate that carbofos residues degrade to non‑detectable levels within 30 days under typical indoor conditions, provided ventilation is adequate and no excessive moisture is present.
For integrated pest management, combine chemical treatment with mechanical control (vacuuming, mattress encasements) to reduce reliance on repeated applications and to interrupt the life cycle of the pest. This approach enhances overall control efficacy while limiting chemical exposure.