Received for publication December 7, 1978. This paper reports the results of research only. Mention of a growth regulator in this paper does not constitute a recommendation for use by the U. S. Dept. of Agriculture nor does it imply registration under FIFRA as amended. Mention of a trademark or proprietory product does not constitute a guarantee or warranty of the product by the U.S. Dept. of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.
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Horticulturist and Plant Physiologist, Nursery Crops Research Laboratory; Agr. Engineer, Fruit and Vegetable Mechanization unit, East Lansing, Michigan; Chemist, Cereal Rust Laboratory, St. Paul, Minnesota and Biometrician, Peoria, Illinois, respectively. The authors acknowledge funding from Electric Power Research Institute, Palo Alto, California, under a cooperative agreement with USDA, SEA-AR, designated RP214 “New Methods and Chemicals to Control Tree Regrowth”.