How long after applying dichlorvos do fleas die? - briefly
Fleas generally die within 10–30 minutes after a dichlorvos treatment. Complete elimination usually occurs by one hour under typical conditions.
How long after applying dichlorvos do fleas die? - in detail
Dichlorvos, a rapid‑acting organophosphate, inhibits acetylcholinesterase, causing overstimulation of the nervous system in insects. After a surface or spray application, adult fleas typically exhibit paralysis within 5–15 minutes. Full mortality is usually observed between 15 minutes and 2 hours, depending on dosage and formulation.
Key factors influencing the kill time:
- Concentration: Higher percentages (e.g., 0.1 % vs. 0.05 %) accelerate onset of paralysis.
- Formulation: Aerosol sprays reach insects more quickly than granular or liquid concentrates that require absorption.
- Environmental conditions: Warm, humid environments increase metabolic rates, shortening the lethal interval; cold or dry conditions delay effect.
- Flea life stage: Eggs and larvae are less susceptible; adult stages respond fastest, while pupae may require up to 24 hours for complete eradication.
Residual activity persists for several days, providing ongoing control of newly emerging fleas. Safety precautions include ventilation, avoidance of direct skin contact, and adherence to label‑specified exposure limits. Re‑treatment may be necessary if infestation rebounds after the residual period expires.
In practice, expect observable immobilization within minutes and complete death of adult fleas within two hours under optimal conditions.