This survey of wild oats and other weeds was conducted to obtain information needed in order to determine the benefits from diallate and triallate for wild oats control. Diallate is being reviewed by EPA as part of the Rebuttable Presumption Against Registration (RPAR) process and triallate is under consideration for RPAR. Pesticides are considered for RPAR review when there is information indicating possible health or environmental hazards. Reregistration of RPAR pesticides is dependent upon rebuttal of the hazards and/or a favorable benefit-risk analysis. Benefits can be actual or potential benefits so the benefits from herbicides for wild oats control is dependent upon the extent of the wild oats problem as well as present usage of herbicides for wild oats control. This weed survey will not only provide information on infestations for present herbicide benefit analysis. but will also serve as a basis for determining weed population shifts in the future. Weed surveys give valuable information on the location and extent of infestation by various species which is important to development of weed prevention and control systems.