Received for publication January 6, 1979. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable. We acknowledge the efforts of members of the apiculture and horticulture research staffs, U.S. Department of Agriculture, Agricultural Research-Science and Education Administration, University of Wisconsin-Madison, for their assistance in field plot maintenance and data acquisition for this and our previous paper. Among these Laura Dulski and Elizabeth Ferguson deserve special recognition. Also, we wish to thank Dr. G. M. Loper, Dr. G. D. Waller, and R. L. Berdel of the Tucson Bee Research Laboratory for their part in conducting and summarizing the sugar chemistry analysis by GLC.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Research in cooperation with the College of Agricultural and Life Sciences, University of Wisconsin-Madison 53706.
Research Entomologist and Research Horticulturist, respectively, Agricultural Research-Science and Education Administration, U.S. Department of Agriculture, Madison, Wisconsin 53706.
Former undergraduate student at the University of Wisconsin-Madison.