ArborSystems Wedgle Direct-Injection Tree Treatment System and chemicals provide reliable systemic insect control on a wide variety of landscape ornamentals and has been used by professional arborists/applicators, urban foresters, tree care professionals and municipal and park managers. As a preventative, it can be used in early spring prior to insect activity in the tree. As a curative, apply as needed spring through fall. And Scale is just one of many destructive pests that our insecticide products control. To learn more information on how to control insects or pests, click here.