Arboriculture & Urban Forestry 35(4): July 2009 higher (about 3x). Trees continue to be evaluated to document longer-term effects. Cost of IMA-jet per tree varies with dos- age, but assuming a per liter cost of $350.00 (Arborjet, January 2009), a tree with DBH < 30 cm (12 in) would require IMA-jet costing $14.00. Trees between 30 and 58 cm (12 to 23 in) DBH, typical of this study, would require $44.64 of IMA-jet. In those situations where systemic applications are desired, imidacloprid appears to be the most effective AI choice of those yet tested, and IMA-jet a successful formulation/application/dosage choice. Parts of the world not yet infested with EGW can utilize this in- formation as they prepare to combat EGW as it expands its range. Acknowledgments. We thank Peter M. Wild, (Arborjet, Inc.), the U.S.D.A. Forest Service, R5 Forest Health Protection and the U.S.D.A. Forest Service, Southern Research Station for financial support. Keahi Bustamente, Andrea Buckman, Ka´ai Bustamente, Diana Crow, Ainoa Kai´aokamalie, Fernando Juan, Luke McLean, Alesa Kneubuhl, Ji- van Osterneck, John Siasi, Briana Welker and Cassidy Ventura of the Haleakala Watershed Partnership for assistance in field work. Harry Zhong (Florida A & M University) and John Mayer (HBEL, Inc.) de- veloped analytical methods to determine emamectin benzoate residues. Joseph Fischer (SRS-RWU-4552) and Jerry Michael (SRS-RWU-4552, Retired) determined imidacloprid residues. Benjamen Parpart, James Parpart, Luke Reed and Steven Walters (SRS-RWU-4552) provided tech- nical assistance with sample preparation. Special thanks to Charles Chi- mera (Hawaii Invasive Species Council) and Paul Krushelnycky (Pacific Island Ecosystems Research Center, U.S. Geological Survey) for initial review of the manuscript. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the United States Government. 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Pest Alert, Florida Department of Agri- culture and Consumer Services, Division of Plant Industry. ©2009 International Society of Arboriculture
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