When should cold aerosol (ULV) applications be made to effectively target adult mosquitoes?

Cold aerosol applications, also known as ultra-low volume (ULV) applications, are most effective for targeting adult mosquitoes during the evening or early morning hours. This timing aligns with the behavioral patterns of many mosquito species, which are most active during these cooler parts of the day.

In the evening and early morning, temperatures are typically lower, and humidity levels may be higher, conditions that can enhance the efficacy of the insecticide. Additionally, mosquitoes are more likely to be in flight and exposed, increasing the chances of contact with the pesticide.

Applying insecticides during periods of high sunlight or heat, such as midday, can be counterproductive as the active ingredient may dissipate more quickly due to evaporation and the mosquitoes may be less active due to the heat. Rain can wash away insecticides before they can effectively target mosquitoes, making it an unsuitable time for application. Daytime applications are generally less effective for the same reasons that apply to midday applications, including increased evaporation and decreased mosquito activity.