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face=Arial>Dave, why do you think polygonum scabrum could cause a --00c09f88d3c2bc28b1048e6f6f43 Content-Type: text/plain; charset=ISO-8859-1 but why would it appear as individual spots - as individual bites would cause - If a plant brushed against my leg wouldn't you expect something like a wiping action that irritated a larger area; unless, as you say, there existed small cuts/abrasions. Marty On Sun, Aug 22, 2010 at 5:14 PM, David & Alison Webster <dwebster@glinx.com>wrote: > Hi Jane & All, Aug 22, 2010 > No sources other than personal experience. One example of delayed > reaction, that I remember from about 1944, is the very itchy rash that can > develop from barley hairs; 3-4 days to come into full bloom as I recall. > Close encounters with Hordeum jubatum would likely have a similar effect. > > We have a patch of Cornus stolonifera at one edge of the yard. If I > brush against it when sweaty then I develop an itch; nothing when dry. > > I don't wish to jump to rash conclusions-- but I suspect many delayed > rashes that are induced by rough plants arise from exposure of living > sub-epidermal tissue, by small cuts/abrasions in the epidermis, to spores, > pollen, gemmae, bacteria, dust mites etc. > > My Polygonum scabrum was a case of thinking one plant (Polygonum > sagittatum), and saying the other. > > > Yt, Dave Webster, Kentville > > ----- Original Message ----- > *From:* David&Jane Schlosberg <dschlosb-g@ns.sympatico.ca> > *To:* naturens@chebucto.ns.ca > *Sent:* Sunday, August 22, 2010 2:48 PM > *Subject:* RE: [NatureNS] blackfly bites, or what are they > > Dave, why do you think polygonum scabrum could cause a skin reaction? It's > got a high oxalic acid content, but so do so many other plants. Also, I've > never seen it in the woods, except in places that are sunny enough to grow > grass. My husband has grass allergies, but I don't know of people who are > not allergic getting rashes from grass. Do you have a source for this > information? I wonder if the dry heat lately would make many plants more > irritating, as has happened with the members of the carrot family..... > As for the chiggers theory, I seem to remember from my childhood in > Maryland, that chiggers attack under elastic, like waistbands. > Obviously, this thread has caught the attention of a fair number of us, as > we all love to walk in the woods. > Jane > > -----Original Message----- > *From:* naturens-owner@chebucto.ns.ca [mailto: > naturens-owner@chebucto.ns.ca]*On Behalf Of *David & Alison Webster > *Sent:* Sunday, August 22, 2010 2:17 PM > *To:* naturens@chebucto.ns.ca > *Subject:* Re: [NatureNS] blackfly bites, or what are they > > Hi Martin, Aug 22, 2010 > Because they are localized to lower leg, I would suspect some delayed > reaction to a knee-high scabrous plant. Possible candidates; Carex spp., > grass, Polygonum scabrum... > Yt, Dave Webster, Kentville > > ----- Original Message ----- > *From:* Martin Alpert <alpertelectric@gmail.com> > *To:* naturens@chebucto.ns.ca > *Sent:* Sunday, August 22, 2010 9:36 AM > *Subject:* [NatureNS] blackfly bites, or what are they > > I walked last thurs into North River Fall, in shorts. > On my lower leg I had quite a few, what looked like, black fly bites. Some > 40 on each leg, randomly spaced - not like I brushed into some noxious > plant. > Usually they are no problem and the next day they are almost gone. > These itch a little. > Today is Sunday and there really red and slightly raised. > Anybody know what happened? > > Marty > > ------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.851 / Virus Database: 271.1.1/3085 - Release Date: 08/21/10 > 03:35:00 > > ------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.851 / Virus Database: 271.1.1/3085 - Release Date: 08/21/10 > 03:35:00 > > -- Martin D. Alpert Alpert Electric RR#5 Antigonish, Nova Scotia B2G 2L3 902-863-5496 --00c09f88d3c2bc28b1048e6f6f43 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable but why would it appear as individual spots - as individual bites would cau= se - If a plant brushed against my leg wouldn't you expect something li= ke a wiping action that irritated a larger area; unless, as you say, there = existed small cuts/abrasions.<div> <br></div><div>Marty<br><br><div class=3D"gmail_quote">On Sun, Aug 22, 2010= at 5:14 PM, David & Alison Webster <span dir=3D"ltr"><<a href=3D"ma= ilto:dwebster@glinx.com">dwebster@glinx.com</a>></span> wrote:<br><block= quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc= solid;padding-left:1ex;"> <div bgcolor=3D"#ffffff"> <div><font size=3D"2">Hi Jane & All,=A0=A0=A0 =A0=A0=A0=20 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 Aug 22,=20 2010</font></div> <div><font size=3D"2">=A0=A0=A0 No sources other than personal experience.= =20 One example of delayed reaction, that I remember from about 1944, is the ve= ry=20 itchy rash that can develop from barley hairs; 3-4 days to come into full b= loom=20 as I recall. Close encounters with Hordeum jubatum would likely have a simi= lar=20 effect. </font></div> <div><font size=3D"2"></font>=A0</div> <div><font size=3D"2">=A0=A0=A0 We have a patch of Cornus=A0stolonifera=20 at one edge of the yard. If I brush=A0against it when sweaty then I develop= =20 an itch; nothing when dry.</font></div> <div><font size=3D"2"></font>=A0</div> <div><font size=3D"2">=A0=A0=A0 I don't wish to jump to rash conclusion= s--=20 but I suspect many delayed rashes that are induced by=20 rough=A0plants=A0arise from exposure of living sub-epidermal tissue, by=20 small cuts/abrasions in the epidermis, to spores, pollen, gemmae, bacteria,= dust=20 mites etc. =A0=A0</font></div> <div><font size=3D"2"></font>=A0</div> <div><font size=3D"2">=A0=A0=A0 My Polygonum scabrum was a case of thinking= =20 one plant (Polygonum sagittatum), and saying the other. </font></div> <div><font size=3D"2"></font>=A0</div> <div><font size=3D"2">=A0=A0=A0 </font></div> <div><font size=3D"2">Yt, Dave Webster, Kentville</font></div> <blockquote style=3D"border-left:#000000 2px solid;padd