[HubbardBrook] [External Email] EAB in HB

Tue Jul 13 08:03:57 EDT 2021

Hi All,

In addition to chemical treatment of high value trees, one can consider a broader silvicultural response to EAB. Accordingly, attached are some recent recommendations for managing ash to consider. Tony D'Amato (UVM and copied here) has offered to provide more information and input on this if the Hubbard Brook community would like.

Wishing all a great week - Paul.

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Paul G. Schaberg PhD
Research Plant Physiologist
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Northern Research Station, NRS 16 - Restoration and Conservation of Rural and Urban Forests

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From: HubbardBrook <hubbardbrook-bounces at lists.sr.unh.edu> On Behalf Of Matthew P. Ayres via HubbardBrook
Sent: Saturday, July 10, 2021 1:40 PM
To: hubbardbrook at lists.sr.unh.edu
Subject: [External Email][HubbardBrook] EAB in HB

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Hi Friends,
It was great to see so many at the meetings this week. Thanks to the scores of you that contributed!

I can provide some follow-up on the EAB news. Thanks to John Deitsch, on the bird crew, for his sharp-eyed find of an emerald ash borer in HB! Below is a note from Bill Davidson, Forest health Specialist, NH Division of Forests and Lands, that he has okayed for me to share. It includes:
"I would say that this is definitely emerald ash borer. This is the farthest north that EAB is detected in New Hampshire ...
Once infested, trees in a forest will decline quickly. Given that an adult beetle was captured within the forest, I think it is safe to assume Hubbard Brook is now at the early stages of infestation. I would expect noticeable signs of infestation to manifest within the next 1-2 years and significant dieback to set-in within 3-4 years. If you are interested in protecting trees, you will probably want to treat them either this year or next."

Enclosed is a map from state of NH to which I have added stars for the point of introduction (detected in 2013) and the new detection in HB. The distance is about 70 km. Thus they have expanded at about 8-10 km / year.

Kyle Lombard, Forest Health Program Coordinator, NH Division of Forests and Lands wrote:
"It sounds like we should probably have a meeting between all of us and the Hubbard brook folks to discuss what's about to happen to their ash forest.  There are some opportunities to learn from the impending loss of all the mature ash.  Also, the managers at Hubbard Brook might have a few areas they want to salvage the value or reduce standing hazard material.  And lastly I would love to try rolling a few spots at HB into our statewide protection project.  The protected sites add another interesting and unique opportunity to study a bunch of different things. Let alone the protection of a mature seed source for the forest.  I'd love to meet in the field at the site that caught the EAB.

Matt

Matthew P. Ayres (h/h)
Professor of Biological Sciences and co-chair of Graduate Program in Ecology, Evolution, Environment & Society
Dartmouth College
Life Sciences Center
78 College Street
Hanover, NH  03755  USA

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http://sites.dartmouth.edu/EEES/

From: Davidson, William <William.Davidson at dncr.nh.gov<mailto:William.Davidson at dncr.nh.gov>>
Sent: Thursday, July 1, 2021 16:28
To: Matthew P. Ayres <Matthew.P.Ayres at dartmouth.edu<mailto:Matthew.P.Ayres at dartmouth.edu>>; Lombard, Kyle <Kyle.D.Lombard at dncr.nh.gov<mailto:Kyle.D.Lombard at dncr.nh.gov>>
Cc: John Deitsch <jfd77 at cornell.edu<mailto:jfd77 at cornell.edu>>; Jeff.Garnas at unh.edu<mailto:Jeff.Garnas at unh.edu>; Elizabeth A. Studer <Elizabeth.A.Studer.GR at dartmouth.edu<mailto:Elizabeth.A.Studer.GR at dartmouth.edu>>
Subject: RE: Emerald Ash Borers at HB?

Hi Matt,

Thank you for sending this along, I would say that this is definitely emerald ash borer. This is the farthest north that EAB is detected in New Hampshire, with the next closest detections to date being about 7 miles away along E Rumney Road in Rumney and along Rt. 3 in Campton near the Plymouth line. These detections were made via visual survey during the past winter and it is possible that there are symptomatic trees in Thornton at this time that were either missed when I did my winter survey or were not symptomatic at the time. The natural dispersal range of EAB is estimated at about 2-4 miles per year, so it seems likely that the source of the beetle could be in Thornton. It's also possible that there are infested trees at Hubbard Brook that haven't reached the threshold of being symptomatic which served as the host. You could fell and debark trees adjacent to the trap to look for signs of infestation.

Once infested, trees in a forest will decline quickly. Given that an adult beetle was captured within the forest, I think it is safe to assume Hubbard Brook is now at the early stages of infestation. I would expect noticeable signs of infestation to manifest within the next 1-2 years and significant dieback to set-in within 3-4 years. If you are interested in protecting trees, you will probably want to treat them either this year or next. Kyle and I are both licensed pesticide applicators and would be happy to help, although we may need approval from the Forest Service to do any work within the WMNF. For protecting ash from EAB, products containing emamectin benzoate as the active ingredient are most effective and the only thing we recommend. This is can be applied as a trunk injection any time during the summer and is effective for 2-3  years per treatment.

Sincerely,
Bill Davidson
Forest health Specialist
NH Division of Forests and Lands
603-892-5156

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