Uptake and efficacy of dinotefuran and other neonicotinoids after soil and trunk application in trees and shrubs

In 2006-2008, soil and bark application of dinotefuran were evaluated against several important tree pests including Aspen Scale, Boxwood Leafminer, Calico Scale, Emerald Ashborer, Fig Wax Scale and Hemlock Woolly Adelgid. In addition, tree uptake of dinotefuran was evaluated by means of ELISA in multiple tree species. Dinotefuran provided rapid control of these pests and efficacious concentrations were present in the foliage of even large trees within 2-3 weeks after application. However, imidacloprid was more residual in foliage. Results from trials evaluating the influence of application method and timing in relation to tree phenology will be presented.