When should adulticiding be scheduled for mosquitoes?

• A. Dawn when activity is low
• B. Dusk or night when activity is high and exposure risk is lower
• C. Midday when sun is hottest
• D. Random times

Answer: (B)

Adulticiding works best when you target mosquitoes during their peak host-seeking period while minimizing risk to people. For many species, that period is around dusk to night, when they are most active and actively trying to bite. Spraying at these times means more of the flying mosquitoes encounter the spray and can be killed, making the treatment more effective. At the same time, most people are indoors or out of treated areas, so the potential for human exposure is lower. Cooler, calmer evening conditions can also reduce drift and help the product stay where it’s needed longer. Spraying at other times—like midday when the sun degrades some products and wind can carry droplets farther than intended or when mosquitoes are less active—tends to be less effective and increases exposure risk.