Received for publication 24 Sept. 1984. Journal article No. 3978 of the Univ. of Arizona Agr. Expt. Sta. This research was supported in part by the Arizona Agr. Expt. Sta., Hatch Act Funds, and a grant from Tacna Jojoba Research and Development Company. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
Assistant Professor. Present address: Dept. of Hort., Colorado State Univ., Fort Collins, CO 80523.
Research Scientist, ARS/USDA, Carl Hayden Bee Research Center, 2000 E. Allen Road, Tucson, AZ 85719.