Ash street trees were sprayed, trunk-injected, or drenched with some of the most promising products being used by professionals and homeowners for protection against emerald ash borer. Over 200 trees were treated in spring of 2004. Branches were removed from each tree in fall of 2004 to count galleries and larvae. Dieback ratings were made in June of 2004 and 2005. After one year of heavy pressure from emerald ash borer the control trees averaged 20 larvae per m², resulting in 55% canopy dieback in June of 2005. Six treatments had a density of new galleries significantly less than the control treatment. Of these, two Arborjet treatments (imidacloprid trunk injections) had the lowest density of new galleries (0 - 1.2/ m²), followed by Acecap trunk injection (3.5), Onyx 32 oz trunk and limb spray-once (3.8), Onyx 12.8 oz foliar spray-twice (4.1), and Onyx 16 oz trunk and limb-twice (4.2). The remaining treatments were not different from the Control. Mean canopy die-back in June of 2004 was 21-24% for imidacloprid trunk injection with the Arborjet system, 28% for ACECAP trunk injections, 29% for 2 Onyx trunk sprays at 32 oz/100 gal, and 30.2% for 2 Onyx foliar sprays at 12.8 oz/100 gal.