Crop oil a petroleum or vegetable-based product generally containing 2 percent emulsifier and 98 percent oil. Defoaming agent an adjuvant used for suppressing both surface foam and trapped air in the spray mixture. Drift retardant an adjuvant used in spray mixtures to reduce drift. Extender see sticker. Plant penetrant an adjuvant that enhances a liquid s ability to penetrate plant roots, leaves, and stems.
Spreader see surfactant.
Sticker an adjuvant that increases the adhesiveness of finely divided solids to solid surfaces. Surfactant a chemical that modifies surface tension. Surfactants can influence the wetting and spreading of liquids, and can modify the dispersion, suspension, or precipitation of a pesticide in water. Thickener an adjuvant that increases the viscosity of a spray mixture. Wetting agent see surfactant.