Roundup: The end of perennial weeds in tree and vine crops?

Anyone who has spent a summer in the San Joaquin Valley hoeing johnson grass, bermudagrass, or nutsedge (nutgrass) out of a young orchard or has labored on a hot summer afternoon trying to pull perennial bindweed out of a young vineyard or a cotton field will be much interested in Roundup (glyphosate). This new herbicide showed promise in earlier studies (California Agriculture, February 1973) and has since proved to be an outstanding product against most annual and perennial weeds.