Any substance added to a spray tank, separate from the pesticide, that will enhance the properties of spray solution so it can deliver the formulation faster and more efficiently. Agricultural spray adjuvants have been known as wetting agents, spreaders, stickers, or surfactants. An “adjuvant” is a substance added to a prescription to aid the operation of the main ingredient. A spray adjuvant performs this function in improving the safety and effectiveness of an agricultural chemical application. The proper use of spray adjuvants can contribute substantially to safer and more effective pest control and understanding their many properties and functions is important to their proper use.