The stump sprout control tests reported here were initiated November 14, 1960, and were completed on February 14, 1961. All of the trees on the periphery of Watershed No. 2 at the Hop-land Field Station were used in this study. Most of the trees were blue oak; however, sufficient black oak existed on the area to obtain some information about treatments upon this species. The treatments were conducted in solid blocks, with one complete set of treatments being located on the southern periphery of the watershed and the other set or replication on the northern boundary.