A Laboratory evaluation of test apparatus and techniques for investigating spray deposit and drift in crack and crevice treatments

Conclusion

A crack's width and depth have very little effect on the amount of insecticide deposited on the outside of the crack. Factors such as rate of application, concentration of insecticide, tank pressure and air turbulence would have a more direct effect on the amount of deposit. While other factors such as humidity and temperature were not considered in this study, other researchers have shown their importance in spray deposition.

The amount of insecticide deposited along the interior of a crack is strongly influenced by the width of the crack. The wider the crack opening, the more insecticide deposited.

Data collected using the test apparatus has shown that the apparatus is able to provide a great deal of information about the factors influencing the amount of insecticide in crack and crevice treatments. The apparatus and techniques utilized during this study have proved to be accurate and sensitive to changes in crack width and depths. This method also gives valuable information as to the efficiency of the application equipment that was used in this study.

The next step is to test the apparatus using pressures. Concentrations, and methods presently being using by pest control operators.