Operational note indoor low-volume spray trials: handheld equipment evaluation

Area of Science:

• Entomology
• Pest Management
• Environmental Science

Background:

• Effective insecticide delivery is crucial for controlling disease vectors like mosquitoes.
• Evaluating different aerosol-mist and thermal fog generators is necessary for optimizing insecticide application methods.

Purpose of the Study:

• To assess the efficacy of handheld aerosol-mist and thermal fog generators for low-flow resmethrin insecticide delivery.
• To compare the effectiveness of treating a block of residences versus individual residences for mosquito control.

Main Methods:

• Four handheld aerosol-mist generators and one thermal fog generator were initially evaluated for low flow rate delivery (< or = 5 ml/min) of resmethrin.
• Two selected generators (London Fog Eliminator, Clarke P1) were used to compare group treatment (16 residences) versus individual treatment.
• Data collected included droplet density, volume median diameter, and mortality rates of caged mosquitoes (Aedes aegypti L.).

Main Results:

• The London Fog Eliminator and Clarke P1 generators were capable of delivering low flow rates of resmethrin.
• Group treatment of residences demonstrated efficacy in mosquito mortality.
• Individual treatment efficacy varied with generator flow control settings and spray duration.

Conclusions:

• The study provides data on generator performance and optimal application strategies for insecticide use.
• Group treatment of multiple dwellings may be a more efficacious approach for controlling mosquito populations in small communities or villages.
• Further research can refine application techniques for enhanced vector control programs.