Step 1: Do you have hemlocks?
If YES, go to Step 2.
If NOT SURE, click the link to get help identifying your tree: Is it a hemlock?
Step 2: Is your hemlock infested by hemlock woolly adelgid (HWA)?
If YES, go to Step 3.
If NOT SURE, click the following link to get help identifying HWA and other common hemlock pests: HWA Identification Guide
If NO, do not treat for HWA. Why?
If your tree’s health is declining due to something other than HWA, then chemically treating they way you would for HWA may not help that problem and could make the real problem worse. See the HWA Identification Guide for other possible pests and diseases that may be affecting your hemlock. If you are unable to see HWA on your hemlock during the winter or you are unable to reach a living branch, you may need to consult a professional. If you do not see HWA and your tree looks healthy then you can either treat prophylactically as a defense against HWA, as imidacloprid can last for multiple years, or you can monitor for the appearance of HWA and any decline in tree health.