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Index of Subjects
Index of Subjects --Apple-Mail-24--262073965 Content-Type: text/plain; charset=WINDOWS-1252; format=flowed; delsp=yes Content-Transfer-Encoding: quoted-printable Hi Paul & Dusan, There are many different insects and diseases (as well as other =20 abiotic factors) which can affect jack pines. One would have to =20 carefully examine the branches, needles, trunk, etc. to even form a =20 theory of what might have been responsible for their demise. Jack =20 Pines can be affected by Scleroderris canker (Gremmeniella abietina), =20= Sphaeropsis blight (Sphaeropsis sapinea), eastern gall rust =20 (Cronartium quercuum), stalactiform blister rust (Cronartium =20 coleosporoides), sweet fern blister rust (Cronartium comptonia), pine =20= weevils (Pissodes spp.), root collar weevils (Hylobius spp.), jack =20 pine sawfly (Neodiprion swainei), jack pine budworm (Choristoneura =20 pinus), and many other insects and diseases. Larvae of the northeastern sawyer (Monochamus notatus) do feed on pine =20= (and other conifers), however, like the vast majority of longhorn =20 beetles, they feed on dead and dying trees, not healthy living ones. =20 Thus, they are not responsible for the demise of trees. If the trees =20 were dying from other causes one might well find some M. notatus (and =20= other longhorn beetles) to be present, but they are not the factor =20 that is responsible for the demise of the trees. Cheers! Chris On 20-Aug-09, at 9:53 AM, Paul S. Boyer wrote: > Could this critter be a suspect? It is Monochamus notatus, who =20 > attacks pines and some other conifers. I saw him yesterday in =20 > Seabright, which is also on the coast of St. Margaret's Bay, Halifax =20= > RM. > > http://idisk.mac.com/docbnj/Public/Monochamus_notatus.jpg > http://idisk.mac.com/docbnj/Public/Monochamus_notatus_close.jpg > > =97 Paul Boyer > > On 18 Aug 2009, at 9:11 AM, David&Jane Schlosberg wrote: > >> We were out for a walk in the Peggy's Cove area (the hills on the =20 >> opposite side of the road, up from the parking lot where the =20 >> skating rink is to be built). A large stand of pines there are =20 >> dead, but there is some appparently healthy new growth. >> -----Original Message----- >> From: naturens-owner@chebucto.ns.ca = [mailto:naturens-owner@chebucto.ns.ca=20 >> ]On Behalf Of Dusan Soudek >> Sent: Monday, August 17, 2009 3:41 PM >> To: NatureNS >> Cc: Richmond Campbell; Beth McGee >> Subject: [NatureNS] Jack Pine Die-back ??? >> >> Two days ago, while traversing the proposed Five Bridge Lakes =20 >> Wilderness Area of the Chebucto Peninsula (HRM) by canoe, I noticed =20= >> a large number of dead Jack Pines in the barrens and semi-barrens =20 >> near Upper Five Bridge Lake. The dead trees show no signs of =20 >> porcupine or any other damage, remain upright, and may have died a =20= >> few years ago. All other tree species in the area (Tamarack, two =20 >> spruce species, Paper Birch) appear to be healthy. >> The dead Jack Pines are too high above the lake to have been =20 >> negatively effected by a slight rise in the lake's level due to a =20 >> new beaver dam at its outlet. They are solitary trees or in small =20 >> clusters, and not part of a canopy, so it doesn't seem likely that =20= >> they are being outcompeted by other tree species as part of a =20 >> natural ecological succession. >> Any other sightings of clusters of dead Jack Pines in the area? =20= >> In the province? Any speculation on what may be happening here? >> Dusan Soudek > Christopher Majka <c.majka@ns.sympatico.ca> | Halifax, Nova Scotia, =20 Canada * Research Associate: Nova Scotia Museum | = http://museum.gov.ns.ca/mnh/research-asfr.htm * Review Editor: The Coleopterists Bulletin | http://www.coleopsoc.org/ * Subject Editor: ZooKeys | = http://pensoftonline.net/zookeys/index.php/journal/index * Associate Editor: Journal of the Acadian Entomological Society | = http://www.acadianes.org/journal.html * Editor: Atlantic Canada Coleoptera | = http://www.chebucto.ns.ca/Environment/NHR/atlantic_coleoptera.html "Whenever I hear of the capture of rare beetles, I feel like an old =20 war-horse at the sound of a trumpet." - Charles Darwin --Apple-Mail-24--262073965 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable <html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; = -webkit-line-break: after-white-space; ">Hi Paul & = Dusan,<div><br></div><div>There are many different insects and diseases = (as well as other abiotic factors) which can affect jack pines. One = would have to carefully examine the branches, needles, trunk, etc. to = even form a theory of what might have been responsible for their demise. = Jack Pines can be affected by Scleroderris = canker (<i>Gremmeniella abietina</i>), Sphaeropsis blight = (<i>Sphaeropsis sapinea</i>), eastern gall rust (<i>Cronartium = quercuum</i>), stalactiform blister rust (<i>Cronartium = coleosporoides</i>), sweet fern blister rust (<i>Cronartium = comptonia</i>), pine weevils (<i>Pissodes</i> spp.), root collar = weevils (<i>Hylobius</i> spp.), jack pine sawfly (<i>Neodiprion = swainei</i>), jack pine budworm (<i>Choristoneura pinus</i>), and many = other insects and diseases.</div><div><br></div><div>Larvae of the = northeastern sawyer (<i>Monochamus notatus</i>) do feed on pine (and = other conifers), however, like the vast majority of longhorn beetles, = they feed on dead and dying trees, not healthy living ones. Thus, they = are not responsible for the demise of trees. If the trees were dying = from other causes one might well find some <i>M. notatus</i> (and other = longhorn beetles) to be present, but they are not the factor that is = responsible for the demise of the = trees.</div><div><br></div><div>Cheers!</div><div><br></div><div>Chris</di= v><div><br><div><div>On 20-Aug-09, at 9:53 AM, Paul S. Boyer = wrote:</div><br class=3D"Apple-interchange-newline"><blockquote = type=3D"cite"><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: = space; -webkit-line-break: after-white-space; ">Could this critter be a = suspect? It is <i>Monochamus notatus</i>, who attacks pines and = some other conifers. I saw him yesterday in Seabright, which is = also on the coast of St. Margaret's Bay, Halifax = RM.<div><div><br></div><d