The Umbelliferous Crops that are grown in California include carrots, celery, and parsley. Carrots are grown on about 23,000 acres. Weed control costs for carrots are about $30 per acre and losses are estimated at $7.50 per acre for a total loss of $860,000 per year to California growers. Most, of the estimated cost of weed control in carrots comes from the use of selective aromatic oil and hand hoeing.

Editorial assistance was obtained from Dr. F. Ashton, University of California, Davis. Cooperation in these tests was received from Richard Puffer, Farm Advisor, Los Angeles County; Marvin Snyder, Farm Advisor, Santa Barbara County; and Ted Torngren, Farm Advisor, Sacramento County. This work was supported in part by the Eli Lilly Co. and Geigy Chemical Corporation.