RH 315 is a new experimental herbicide with considerable promise for use in California agriculture. It is not registered for use. This is a progress report of cooperative research on a new product.

Cooperating in these studies were L. S. Jordan, Associate Professor of Horticultural Science and Associate Plant Physiologist, University of California, Riverside; J. M. Lyons, Associate Professor, and Fred Whiting, Lab Technician, Department of Vegetable Crops, University of California, Riverside; R. C. Russell, Laboratory Technician, Department of Horticultural Science, University of California, Riverside; H. Ford, Marvin Snyder, Farm Advisors in Imperial and Santa Barbara counties respectively; Bill Fischer and Don May, Farm Advisors, Fresno County; Tom Tisdell, Botany Specialist, University of California, Davis.

This work was supported in part by Rohm & Haas Company. Cooperation was received from the Moreno Field Station staff and many farmers who contributed land, produce, and time to the project.