Over the past two weeks, we've been treating all the Hemlocks on the golf course for the notorious insect, the Woolly Adelgid. Since about 2002, this insect has devastated the Appalachian Mountain's population of Hemlocks. The only way to save the trees is through regular treatments of insecticides. We rely on soil drenches of Imidacloprid or bark treatments of a product called Safari. Since we treated with Safari last season, we are using Imidacloprid this season. Imidacloprid lasts much longer in the tree (up to 7 years according to research) but takes longer to be absorbed and translocated through the tree. Safari on the other hand, is so water soluble, it makes its way up the tree much faster and therefore is better for bad infestations that need to be addressed quickly. However, it doesn't have the long residual as it's counterpart. It only offers about one year of protection.