We know that Hurricane Irene has passed by and we’ve cleaned up the storm damage , but that doesn’t mean it’s time to rest easy about problems that may harm the trees and ornamentals in your landscape. Right now is the time to apply a dormant horticultural oil treatment (a reduced-risk, “organic” pesticide) to knock down the population of spider mites, eriophyid mites, aphids, lacebugs, adelgids, psyllids, scale insects and a myriad of other insects that attack your trees. Fox Tree Services also applies a dormant copper-based fungicide starting around now to help protect against plant diseases such as anthracnose, scab and leaf spot. In the photo above you can see an example of white prunicola scale (Pseudaulacaspis prunicola) which has been attacking privet on the east end of Long Island for the past few years. We have found dormant oil treatments at this time to be effective in reducing the 3d generation of this insect.