Research was conducted to evaluate several oil adjuvants for use in ultra-low-volume (ULV) application and several drift retardants for use in low-volume (LV) application of fipronil by aircraft for boll weevil control.

The efficacy of fipronil in different oil adjuvants was determined. The three oil adjuvants tested were: once refined cottonseed oil from Yazoo Valley Oil Mill, Greenwood, MS., Orchex^® 796, and WS2908. Orchex^® 796 and WS2908 are horticultural mineral oils developed by Exxon Chem. Co., Baytown, TX. WS2908 is a blend of Orchex^® 796 and EX-100, a drift retardant.