Invasive SpeciesHemlock wooly adelgid

Adelges tsugae
FOUND by sniffly salamander
Cape Elizabeth
ID Confirmed
Quality checked by sniffly
Peer reviewed by
Field Notes
We went for a dog walk in Robinson woods. Early in the loop there was a hemlock twig on the ground that looked like it had HWA on it. I didn't see which tree it had come from and didn't see any hemlocks in our immediate vicinity. As we kept walking along the loop, it goes along the road for a bit. I kept an eye out for eastern hemlock trees. We came across some, and they also showed evidence of HWA. We saw an owl later in the walk. We all thought it was strange to see an owl in the daytime, but we aren't birders, so it might not be strange. We thought this might be a barred owl. I've attached a photo of the owl in place of a sketch.If you click on it it will open in a separate window and it will be right-side up.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
You can see the white tufts at the base of the needles. This is evidence of HWA. These white, waxy tufts cover the HWA nymphs.
Photo of my evidence.
Here's another photo in a little better focus.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Adelges tsugae
Common name:
Hemlock wooly adelgid
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.612094 °
W -70.215157 °
Observation Site Information
A photo of our study site.
Upland - Forest
Trip Information
Robinson Woods
Trip date: 
Sat, 2016-06-04 12:45
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey


Despite considerable mortality overwinter at this site, adelgid continues to thrive. (Page 4)

I was back there again this weekend, and saw a tree that looked very infested. It had some flagging on it, so I wondered if someone was researching. I checked another tree quickly and didn't see any. I saw a hemlock that looked totally dead. I wondered if it was from HWA.

I didn't have my phone on me to take pictures, and my hiking companions kept me moving. But I wondered if the site has gotten any worse or stayed the same?


This site is one that the MFS has monitored for several years for overwintering mortality of HWA as well as Progrediens generation recovery. The latter measurement takes place in Mar and June, and branches are flagged in March, assessments made, with followup assessments on the same branches in June. We do not have a tree health assessment plot at this site to help answer your question re: whether it is worse. It is likely that the hemlocks will continue to decline and episodes like last year's drought will help to (at least temporarily) accelerate that decline. Cape Elizabeth also has the 'esteem' of being the first township in ME where MFS mapped oak mortality related, in part, to a history of winter moth defoliation (~300 acres in 2016, drought likely also played a role there).

Hi Akanoti,

That is really too bad to hear. This link does not seem to be working, Could you try posting a different link? I'd love to ready more about this forest pest.


hmm. It worked for me. Maybe browser settings? Regardless, there is another version (but I can't give you a page): If that fails, it is a link to the April 2016 issue of this publication:

Thank you! I was able to open them both. Thanks for the quick reply.