The purpose of this annual report was to document the successes, failures and challenges of ODOT's chemical weed control program in 2005. In that each field division makes herbicide application decisions independent of other field divisions, we attempted to minimize comparisons among divisions in this report. However, it can be both interesting and useful to document trends in ODOT herbicide programs when similarities in field division programs are surveyed. We attempted to document the progress of each field division on its own merit, considering the different attitudes and unique management goals within each field division. When appropriate, recommendations and comments were made to assist divisions in solving issues that became apparent after reviewing this year's herbicide use surveys (Appendix A). It was our intent that the comments and criticisms included in this report would be of benefit to each field division's herbicide program. We are aware that each field division, in the development of its herbicide program, will have considerations unknown to Oklahoma State University Roadside Vegetation Management Program personnel. If there is disagreement by any division personnel to comments or recommendations, we ask that we have the opportunity to clarify recommendations