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Hemlock Woolly Adelgid #876625

Asked July 10, 2024, 10:13 AM EDT

Hi! It is the second summer living on my property in the Catskills and it looks like we have the Hemlock Woolly Adelgid on our property. I saw that is in an invasive species and we love our hemlock trees, so I wanted to reach out and see if there were any measures I could take to keep it from spreading and / or try to maintain the health of my trees. Thanks for your help in advance!

Ulster County New York

Expert Response

Katie,
Wooly adelgid is really a problem. If your hemlocks are not big trees, you can spray them, at least semi-annually every year, with insecticidal oil spray. If they are trees too big to reach the majority of their foliage, you would have to engage a professional to treat the trees. That of course could be expensive. 
Here is a link to a more extensive overview of wooly adelgids that Cornell has put together, including short and long term management strategies:

I'm sorry we can't be more helpful. Good luck

Richard 
Master Gardener Volunteer

On Wed, Jul 10, 2024 at 10:13 AM Ask Extension <<personal data hidden>> wrote:

Hi Cornell,

Question #0146543 has been assigned to you by SYSTEM (Auto Assignment)

Hemlock Woolly Adelgid

Hi! It is the second summer living on my property in the Catskills and it looks like we have the Hemlock Woolly Adelgid on our property. I saw that is in an invasive species and we love our hemlock trees, so I wanted to reach out and see if there were any measures I could take to keep it from spreading and / or try to maintain the health of my trees. Thanks for your help in advance!

From: Katie Finger
Submitted: 07/10/2024 10:13 AM


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An Ask Extension Expert Replied July 10, 2024, 11:21 AM EDT

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