Treating for Hemlock Woolly Adelgid in the fall will mitigate the pest just as they are coming out of their dormant stage, or prevent your healthy Hemlocks from being infested.
As temperatures begin to cool in the fall, Hemlock Woolly Adelgid leaves its summer dormancy to once again feast on the Hemlocks across the North East. Depending on the temperature, this usually occurs between late September and October. Preventative or controlling treatments at this time are best as they will keep the pests at bay all fall, winter, and into the spring – a period of time when they are most devastating to Hemlocks.
Preventing and controlling Hemlock Woolly Adelgid (HWA) can be accomplished with a foliar application of Horticultural Oil. For the best preventative measures, an application in both the early spring and fall will keep your Hemlocks free of this pest. Hemlocks that have already been infested may require more treatments to kill the pest, and keep it from returning. For trees that have already been seriously infested, pair a foliar application with a soil injection treatment for the best chance of saving the Hemlock.
Once infested, a Hemlock can be quickly defoliated by HWA. To ensure your Hemlock trees remain healthy and safe, consider preventative Woolly Adelgid treatments. Our Arborists recommend preventative HWA treatments on all Hemlocks, even if they have never been infested, as the Hemlock Woolly Adelgid has become so prevalent in our region. It is not a matter of if; it is a matter of when your Hemlocks will be infested.
The most popular question regarding HWA treatments is, “What does it cost?” Most HWA treatments will be under $150, and can be much less depending on the number and size of trees to be treated. The cost of removing and/or replacing the dead Hemlocks is significantly greater than the investment in HWA preventative treatments, so keeping your Hemlocks safe and healthy with preventative treatments is always a wise idea.
To have a Certified Arborist out to inspect your Hemlocks, or to sign up for a Hemlock Woolly Adelgid treatment, click the button below.
Treating HWA with a foliar application of Horticultural Oil will control and prevent the prevalent pest.