What are the typical sizes of ground applications of adulticides?

• A. 1-5 microns.
• B. 5-9 microns.
• C. 10-25 microns.
• D. 25-50 microns.

Answer: (C)

Droplet size in ground adulticide applications determines how far and how well the spray will reach resting mosquitoes in vegetation. For ground ULV fogging, the most effective balance is achieved with droplets in the 10-25 micron range. These fine enough droplets stay suspended long enough to drift into canopy and other hiding spots where mosquitoes rest, increasing the chance of contact, but not so fine that they drift away or evaporate before reaching the target. Droplets smaller than this tend to drift too far or evaporate, reducing deposition on insects and surfaces. Droplets larger than this tend to settle quickly, which limits their reach into vegetation and hides. So, 10-25 microns is the typical, practical range for ground applications to maximize target exposure while managing drift.