{"id":7916,"date":"2025-05-05T19:16:22","date_gmt":"2025-05-05T23:16:22","guid":{"rendered":"https:\/\/backlandscoalition.ca\/?page_id=7916"},"modified":"2025-05-06T07:27:18","modified_gmt":"2025-05-06T11:27:18","slug":"hemlock-wooly-adelgid","status":"publish","type":"page","link":"https:\/\/backlandscoalition.ca\/?page_id=7916","title":{"rendered":"Hemlock Wooly Adelgid"},"content":{"rendered":"

Drafting<\/em><\/p>\n

On this page
\n– 1. Wikipedia description of HWA<\/a>
\n– 2. HWA Video Series<\/a>
\n– 3. HWA in Nova Scotia<\/a>
\n– 4. HWA in the Backlands<\/a>
\n– 5. How to Help<\/a><\/p>\n

\"\"<\/a>

Observations of HWA reported on iNaturalist<\/a><\/strong> (accessed Nov 15, 2023)<\/p><\/div>\n

1. Wikipedia description of HWA<\/strong><\/p>\n

From Wikipedia<\/a> (15Nov2023), references and some links removed:<\/p>\n

\u201cThe hemlock woolly adelgid<\/b> (<\/sup>Adelges tsugae<\/b><\/i>), or\u00a0HWA<\/b>, is an\u00a0insect\u00a0of the order\u00a0Hemiptera<\/a>\u00a0(true bugs) native to\u00a0East Asia. It feeds by sucking sap from hemlock and spruce trees (Tsuga<\/a><\/i>\u00a0spp.;\u00a0Picea<\/a><\/i>\u00a0spp.).<\/p>\n

\u201cIn its native range, HWA is not a serious pest because populations are managed by natural predators and parasitoids and by host resistance.<\/sup><\/p>\n

\u201cIn eastern North America\u00a0it is a destructive\u00a0pest\u00a0that threatens the eastern hemlock (Tsuga canadensis<\/a><\/i>) and the Carolina hemlock (Tsuga caroliniana<\/a><\/i>). HWA is also found in western North America, where it has likely been present for thousands of years. In western North America, it primarily attacks western hemlock\u00a0Tsuga heterophylla<\/a><\/i>\u00a0and has only caused minor damage due to natural predators and host resistance.<\/sup><\/a><\/p>\n

\u201cAccidentally introduced to North America from Japan, HWA was first found in the eastern United States near Richmond, Virginia, in 1951.<\/sup>\u00a0The pest is now found from northern Georgia to coastal Maine and southwestern Nova Scotia.[<\/a><\/sup>As of 2015, 90% of the geographic range of eastern hemlock in North America has been affected by HWA.<\/sup>\u201d<\/p>\n

Read More on Wikipedia<\/a><\/p>\n

2. HWA Video Series<\/strong><\/p>\n\n\n\n
\n

Hemlock Woolly Adelgid (HWA) Video Series
\non Medway Community Forest Coop YouTube Channel<\/strong><\/p>\n

\n

\"\"<\/a>P<\/strong>art 1: Listening to your Hemlock<\/strong><\/a> (10 min 45sec, posted Nov 13, 2024)<\/p>\n

“…we take you into the forest to learn how to identify this invasive pest on eastern hemlocks.”<\/p>\n

\n

Part 2: Controlling HWA<\/a><\/strong> (min 33 secs, posted Nov 13, 2024)<\/p>\n

“…ecologist Donna Crossland shares her expertise on managing Hemlock Woolly Adelgid (HWA) infestations, diving into the best tools and treatment methods available today”<\/p>\n

\n

Part 3: Preparing the site <\/strong><\/a>(8 min 45 sec Posted nov 13, 2024)<\/p>\n

“…we show you everything you need to know about preparing your site for treatment against Hemlock Woolly Adelgid (HWA). Before treatment begins, it’s crucial to carefully measure and mark each tree to ensure precision and effectiveness.”<\/p>\n

\n

Part 4: Basal Bark Spraying<\/strong><\/a> (19 min, Posted Nov 13, 2024)<\/p>\n

“…[Donna Crossland] walks you through the essentials of setting up a basal bark spraying operation to combat Hemlock Woolly Adelgid (HWA) infestations.”<\/p>\n

\n

Part 5: Injecting your Hemlock<\/strong><\/a> (20 min, Posted Nov 13, 2024) <\/a><\/p>\n

“Ecologist Donna Crossland explains some of the methods for injecting trees, as well as some drilling techniques.”<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3.\u00a0 HWA in Nova Scotia<\/strong><\/a><\/strong>
\nA set of pages on www.versicolor,ca\/nstriad provide some of the history of HWA in NS, discussion of related issues etc,\u00a0 up to June 5, 2024.<\/p>\n

Subpages<\/em>
\n\u2013 Eastern hemlock Notes<\/a><\/em>
\n\u2013 About \u201cIn the Quiet & the Dark\u201d<\/a><\/em>
\n\u2013 Discussions in Social Media<\/a><\/em>
\n\u2013 Comprehensive Info<\/a><\/em>
\n\u2013 The Adelgid<\/a><\/em>
\n\u2013 Pesticide Treatment<\/a><\/em>
\n\u2013 Biological Control<\/a><\/em>
\n\u2013 Silviculture<\/a><\/em>
\n\u2013 Post HWA infestation Impacts<\/a><\/em><\/p><\/blockquote>\n

\n

\u2013 \u201cIn The Quiet and The Dark\u201d<\/a><\/strong>
\n\"\"<\/a>A Sea to Sea<\/strong> Production commissioned by CBC, 44 min. 0n CBC Gem, Featured on CBC Television Oct 7, 2023. For some background, related interviews, view Morning File<\/strong> <\/a>(Hfx Examiner) for Sep 19, 2023<\/a>: In the Quiet and the Dark: \u201cNew documentary on the people trying to save eastern hemlocks from total devastation\u201d; also CBC Mainstreet<\/strong> for Oct 6, 2023 <\/a>\u00a0 in which CBC\u2019s Alex Mason spoke with Nance Ackerman, the film\u2019s director.<\/p>\n

4. HWA in the Backlands<\/strong>
\n‘Just getting going on monitoring
\nView iNaturalist Project, Eastern Hemlock in Halifax NS Backlands<\/a> (set up May 5, 2025)<\/p>\n

DRAFTING\/TESTING MAY 5, 2025… The purpose: To document occurrence of Eastern Hemlock and of HWA (Hemlock Wooly Adelgid) in the Backlands (Halifax, NS, Canada).<\/em><\/p>\n

To indicate that a search has been made for HWA on a particular specimen, add the tag “BacklandsHWAneg” when no evidence of HWA is found, or “BacklandsHWApos” when there is evidence of HWA (documented with photos).<\/em><\/p>\n

Currently, our understanding is that E. Hemlock is restricted to few areas on the periphery of the Backlands; it’s absence over most of the area is probably attributable to it being very fire intolerant.<\/em><\/p>\n

There are some very large hemlocks and patches of hemlock-dominated stands to the east of Williams Lake (and perhaps elsewhere) that are not documented on the Nova Scotia Provincial Landscape Map Viewer. So it’s ‘helpful to document “big” hemlocks (20 in\/0.5 m diameter at breast height and larger) as they confer Old Growth features to the landscape; to do so, measure the cbh (“circumference at breast height” – at 4.5 ft\/1.4 m above the base); calculate the diameter as [cbh*7\/22].<\/em><\/p>\n

The Project Map below showing the Backlands area has two envelopes (polygons), the inner one for the Backlands proper, and the outer one a slightly larger area so it includes nearby hemlocks which could be hosts for HWA and possibly infected before hemlocks in the Backlands proper are infected.
\n<\/em><\/p><\/blockquote>\n

Also view Lovers Lane to Turtle Bay<\/strong><\/a> for description of an area on the shore at the northeast end of Williams lake with a concentration of hemlocks and some very large individual trees.<\/p>\n

5. How to Help<\/strong>
\nReceived from Shaiuna Doll, HRM Environmental Specialist, May 5, 2025<\/p>\n

“If you are interested in continuing your contributions to the municipality\u2019s efforts to combat HWA spread in the Halifax Region, I have included a list of things individuals can do to help:<\/p>\n