Adjuvants have been used as tools to enhance pesticide performance for a long time. More than 200 years ago, growers used adjuvants such as tar, sugar, or tree sap to stick Bordeaux mixture fungicide to grapes. In the late 1880’s, soap was used with kerosene to destroy insect eggs, and later to increase insecticide activity of arsenic (Gillette, 1890). Fish and whale oil were also commonly used adjuvants. In 1942, surfactant enhancement was reported in some of the first experiments with 2,4-D (Zimmerman and Hitchcock 1942). Later, triazine herbicide activity was greatly enhanced with paraffinic oils (McWhorter, 1956) and then with oil-surfactant emulsions (crop oil concentrates) (Holstun and Bingham, 1960). Adjuvants transformed triazine soil herbicides into foliar ones. Today, adjuvants are universal components of herbicide sprays.