Effects of Wind Speed on Aerosol Spray Penetration in Adult Mosquito Bioassay Cages

Droplet Size Characteristics for
Sprayers

• Spray droplet spectra data for truck mounted sprayers applying water-based sprays.

• Spray droplet spectra data for truck mounted sprayers applying BVA 13 ULV oil

• Spray droplet spectra of hand-held sprayers using water-based sprays.

• Spray droplet spectra of hand-held sprayers using oil-based sprays.

Spray Discharge Direction 

It is generally being considered why, what, when, how much and how to apply a pesticide. One aspect that needs attention is where to apply a pesticide. In which direction the spray is discharged (in addition to other factors) determines where the spray is going to end. The figures 1 & 2 show the spray cloud moving in two different directions. 

World Health Organization has the following recommendations for space spraying with vehicle mounted equipment.

• For vehicle-mounted equipment, in areas where the roads are narrow and the houses are close to the roadside, the spray should be directed backwards from the vehicle. In areas where the roads are wide, with buildings far from the roadside, the vehicle should be driven close to the roadside and the spray should be directed at an angle (downwind) to the road rather than directly behind the vehicle. 
• The nozzle of vehicle-mounted cold fog machines may be directed upwards at an angle when there are barriers that impede airflow, e.g. boundary walls and fences; for vehicle-mounted thermal foggers, the nozzle should be directed horizontally.
• Images of sprayer coverage (Figure 1,  Figure 2)