Basal soil injection (BSI) is a low-volume method of soil injection in which a high concentrate solution of imidacloprid is injected in a ring near the base of a treatment tree. Previous methods used by the Asian Longhorn Beetle Eradication Program have used a high volume solution placed in concentric rings expanding out from the base of the tree. The BSI method was chosen for treating trees in a woodland situation where there is extensive undergrowth of weeds and ivy, and competing roots from neighboring trees. Previous studies utilizing other soil injection methods in wooded habitats have resulted in no detectable residue in treated trees. Woodlot trees were compared to similarly treated trees growing on the street and in an open field. Foliage samples were collected 1 and 3 months post-treatment and assessed for imidacloprid levels using a commercially available ELISA test kit.