How quickly do bedbugs die from dichlorvos? - briefly
Adult bedbugs exposed to standard vapor concentrations of dichlorvos die within 4–12 hours. Eggs generally require 24–48 hours to perish.
How quickly do bedbugs die from dichlorvos? - in detail
Dichlorvos (DDVP) acts as an acetylcholinesterase inhibitor, causing rapid nervous‑system failure in Cimex lectularius. Laboratory bioassays using paper‑contact or spray applications show mortality within minutes at label‑recommended concentrations (approximately 0.1 g L⁻¹). Typical observations are:
- Immediate knock‑down: 30 – 90 seconds after direct contact, insects exhibit tremors and loss of coordination.
- 90 % lethal time (LT₉₀): 5 – 10 minutes under optimal exposure (full surface coverage, no shelter).
- Complete mortality (LT₁₀₀): 15 – 30 minutes for exposed populations; survivors in protected crevices may persist longer.
Factors influencing the kill rate include:
- Formulation type: Aerosol sprays achieve faster contact than residual foggers because droplets reach insects directly.
- Surface porosity: Non‑porous surfaces (glass, metal) retain higher active‑ingredient concentrations, shortening lethal times.
- Insect stage: Nymphs die slightly faster than adults due to smaller body mass.
- Resistance level: Populations with documented organophosphate resistance exhibit extended LT₅₀ values, sometimes exceeding 30 minutes.
- Temperature and humidity: Higher temperatures (≥ 25 °C) accelerate enzymatic inhibition, reducing kill time.
Field reports confirm that a single thorough application in infested rooms eliminates the majority of bed bugs within half an hour, provided the product is applied according to manufacturer instructions and all hiding places receive coverage. Re‑treatment may be necessary for insects shielded by heavy clutter or fabric, where exposure is limited.
Safety considerations: dichlorvos volatilizes rapidly; inhalation risk mandates ventilation and personal protective equipment. Residual activity diminishes within 24 hours, so re‑application after that interval offers no additional benefit.
In summary, when applied correctly, dichlorvos can eradicate a bed‑bug population in under 30 minutes, with most individuals succumbing within the first 10 minutes.