Test plots containing 40-42 specimens of various species of hemlock were established in Lasdon Park Arboretum near Somers, NY. A total of three plots were established in distinctly different microhabitats within the arboretum, and half of each plot was fertilized shortly after planting in order to measure growth response of the test species to fertilizer and the impact of fertilization on susceptibility to the hemlock woolly adelgid. Trees will be artificially infested with adelgids in mid spring, and the first data will be collected in the fall.