Location: Aerial Application Technology Research
Project Number: 3091-22000-032-07-R
Project Type: Reimbursable
Start Date: Jul 1, 2014
End Date: Sep 30, 2015
The overall objective of this project is to determine the relative toxicity of mosquito adulticides to honey bees with respect to the type of application equipment and methods used. ARS scientists will characterize volume and droplet size of spray flux downwind of applied spray treatments. Spray flux and size will be evaluated for multiple spray treatments of varying spray rate and droplet size for movement and deposition through the test area. The objective is to determine which spray treatments result in spray levels that have negative impacts on honey bees in the treatment area.
Spray flux and droplet size will be measured for each type of equipment and spray method used following established spray droplet sizing methods. Mechanical sampling of applied sprays will be conducted using rotary impaction devices from which both spray droplet size and volume deposition can be extracted. Similarly, bees will be collected and processed for fluorescent deposition and spray coverage using camera and microscopy imaging. The rotary impactors will be corrected for sampling inefficiencies to return an estimate of the actual spray flux moving within the treatment area while the bees will provide and estimate of the portion of the spray actually depositing on the target. Working with University personnel and and other cooperating researchers, the collected data will be evaluated, alongside additional data including meteorology, canopy micro-climate, visual deposition assessments, and biological efficacy to determine impact of spray treatments.