Technical Abstract: Citrus producers have found that many pesticides, when applied properly, are very effective at suppressing or eliminating citrus psyllids, which are a vector of citrus greening. Due to threat that greening, several pesticides have been granted special local needs registration for use in the State of Florida if the product is sprayed with a volume median diameter of 90 microns or greater. A number of studies involving numerous citrus sprayers and active ingredients were conducted to determine the droplet size generated by the different sprayers and how to adjust the sprayers to meet the 90 micron requirement. In the sprayer tests, it was found that reductions in engine speed or increases in flowrate were required to increase droplet sizes to meet the product label required droplet size. As the equipment tested here represent the most typical application equipment used in Florida for psyllid control, these results will provide applicators, growers, and extension agents with general guidelines to insure that spray systems are operated in a manner that complies to label restrictions.