Why can’t the spray be seen coming out like before?
The spray that you used to see during mosquito spraying was produced by the use of diesel oil of fog oil. This oil acted as a carrier to help disperse the pesticide in the proper concentrations. Newer methods of spraying called ultra low volume or ULV have eliminated the need for the oil therefore no fog is seen during the spraying. This newer method still provides effective control of mosquitoes and eliminates the adverse health and environmental effects of the oil.
