Herbicide drift is a recurring problem in agriculture, and the growing use of postemergence herbicides will increase the potential for off-target injury. Due to the nature of herbicide application, it is virtually impossible to eliminate drift. However, applicators can greatly reduce this risk by using appropriate sprayer equipment and common sense. An article by Mueller and Womac in a 1997 issue of Weed Technology(volume 11, pages 639-643) provides useful information on factors that influence drift with glyphosate. The article is entitled "Effect of formulation and nozzle type on droplet size with isopropylamine and trimensium salts of glyphosate." My article will provide a brief summary of a portion of the results reported in their paper.