Received for publication November 18, 1968.
Extension Weed Control Specialist, University of California, Davis and Riverside, respectively.
Farm Advisors, Agricultural Extension Service, Sutter County.
This work was supported in part by the Geigy Chemical Company, the Thompson-Hayward Chemical Company, the Upjohn Company, and the Eli Lilly Chemical Company. The authors wish to acknowledge the assistance of Mr. James Yeager and Lee Smith, Botany Department, University of California, Davis. The statistics were run by Dr. T. M. Little, Biometrician, University of California, Riverside.
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