How long do fleas die after treatment with dichlorvos? - briefly
Fleas typically succumb within 5–10 minutes of exposure to dichlorvos, and most are dead within an hour. Residual action can continue to eliminate any survivors for several additional hours.
How long do fleas die after treatment with dichlorvos? - in detail
Dichlorvos (DDVP) is an organophosphate insecticide that interferes with acetylcholinesterase activity, causing rapid nervous system failure in fleas. Mortality typically occurs within minutes of direct exposure, with most adult fleas ceasing movement in 5–10 minutes. Complete kill rates are achieved by 15–30 minutes when the product is applied according to label instructions and the dosage is sufficient to saturate the target area.
Factors influencing the time to death include:
- Concentration of the formulation – higher percentages (e.g., 2 % solution) accelerate neurotoxic effects.
- Method of application – sprays, foggers, or impregnated strips deliver varying amounts of active ingredient to the flea’s cuticle.
- Environmental conditions – temperature above 20 °C and low humidity increase absorption rates, shortening the lethal interval.
- Flea life stage – adult fleas are most vulnerable; eggs and pupae may require longer exposure or repeated treatments.
Residual activity persists on treated surfaces for several days, providing ongoing control of newly emerging fleas. However, the acute lethal phase for the initial adult population is confined to the first half‑hour after treatment.