The leaf beetle Diorhabda elongata Brullé (Coleoptera: Chrysomelidae) is a newly released biological control agent for saltcedars, Tamarix sp., an exotic, invasive weedy tree in the Western US. Two pheromone components (2E,4Z-heptadienal and 2E,4Z-heptadienol) and several six-carbon general green leaf volatiles are highly attractive to the beetles in the field. These compounds have a relatively high, but similar volatility due to their small, but comparable molecular size. However, placed on filter paper cartridges for electrophysiological stimulation, the compound release rates are very different, and are correlated to compound separation on non-polar GC capillary columns. The results of a simple stimuli quantitation technique and an electrophysiological dose-response study are presented. The results are discussed in relation to the behavioral responses of the beetles in the field.