2009 Annual Report 1a.Objectives (from AD-416) Identify semiochemicals from host plants, natural enemies and/or conspecifics that can be used as tools in the management of the invasive emerald ash borer. 1b.Approach (from AD-416) Laboratory and field research will be done to identify, isolate, synthesize, and test antennally active semiochemicals of emerald ash borer. 3.Progress Report Work continued on attractants for the emerald ash borer (Agrilus planipennis, EAB), a severe invasive pest from Asia, focusing on host-plant-related compounds. EAB antennae were found to be especially sensitive to three compounds (sesquiterpenes) present in ash bark in trace amounts suggesting the compounds could be important attractants. The three compounds are not commercially available, but progress was made in obtaining at least one of the compounds ((-)-eremophilene) in good amounts by purification of a chemical precursor from a plant oil (phoebe) followed by chemical modification to the desired product. This material was obtained in 50- gram amounts sufficient for field testing and to evaluate if (-)-eremophilene-enriched oils can be effective baits in traps for beetle detection alone or in blends. In addition, a formulation was developed for a steady release of (-)-eremophilene at relative high amounts, lasting at least a week under field conditions.