It is a worthy tree version of Edvard Munch's famous "The Scream" painting, awesome grain(?) structure.
It looks like successive failed attempts by callous tissue to close over a wound or where a branch used to be. Very interesting. -AJ [email protected] wrote: > Ryan: > > Your canker is not butternut canker. Buttertnutcanker never heals > over like that canker did and it oozes a black sap. I will try to > post a couple of photos of the disease when I get back to WV. > > Russ > > > -----Original Message----- > From: Ryan McEwan <[email protected]> > To: [email protected] > Sent: Wed, Sep 30, 2009 1:54 pm > Subject: [ENTS] Is this the canker on butternut? > > all, > > I found this tree in Dysart Woods many years ago. It was winter- no > twigs to be had (too tall)- and the bark, as you can see is deformed. > > Neither myself, nor a couple of pretty good fellow dendronerds that > were along with me, could not come up with a positive ID for the > tree, much less the canker. > > My best guess was a butternut infected with the canker, but I am not > confident at all about that ID. > > Can anyone confirm or reject this hypothesis based on the image? > > thanks > ryan > > On Wed, Sep 30, 2009 at 10:09 AM, DON BERTOLETTE > <[email protected] <mailto:[email protected]>> wrote: > > Mike- > Regarding the butternut, I encountered them in Kentucky in the > 1980s...I suspect there are folks in this forum that can do a > better job than I. I'd think that others might be interested in > one that is seemingly vigorous and reproducing? It's a pretty > pretty wood! > -Don > > > Date: Tue, 29 Sep 2009 08:51:08 -0700 > > Subject: [ENTS] Re: Marion Brooks Natural Area, Elk County, PA > > From: [email protected] <mailto:[email protected]> > > To: [email protected] <mailto:[email protected]> > > > > > > Don, > > It's quite rare around these parts, being pretty much confined > to the > > lower Saint John river valley, around where I live. I've been trying > > to find as many as possible. I came across a nice one about a month > > ago growing on a small island in the Saint John river - it was > > absolutely loaded with nuts. > > What does the blight look like? > > > > Mike > > > > > > > > On Sep 28, 10:11 pm, Lee Frelich <[email protected] > <mailto:[email protected]>> wrote: > > > Don: > > > > > > You mean a positive reinforcement of negative effects. There > are plenty > > > of those involving shade and an allelopathic chemical, or > changing the > > > chemistry of the litter layer, say to a lower pH and then > throwing in an > > > allelopathic chemical and shade (i.e. black walnut). Or > making the > > > litter layer poor in nitrogen plus an allelopathic chemical > and shade > > > (Bracken fern), and all of the above smothering competition with > > > litterfall (e.g. sugar maple, the latter reinforces chemical and > > > resource changes with a physical effect). Trees keep out their > > > competition with multiple strategies. > > > > > > Lee > > > > > > DON BERTOLETTE wrote: > > > > Lee- > > > > Can you suggest an allelopathically positive effect (chemical > > > > combinations that turn out to be synergistic come to mind)? > > > > -Don > > > > > > > > Date: Thu, 24 Sep 2009 14:18:13 -0500 > > > > > From: [email protected] <mailto:[email protected]> > > > > > To: [email protected] > <mailto:[email protected]> > > > > > Subject: [ENTS] Re: Marion Brooks Natural Area, Elk County, PA > > > > > > > > Don: > > > > > > > > Most ecologists take allelopathic to mean negative effects > on other > > > > > plant species. The plants that benefit could be either > directly and > > > > > positively affected by the allelopathic chemical (but this is > > > > unlikely), > > > > > or benefit indirectly by being insensitive to the allelopathic > > > > chemical, > > > > > but being freed from competition by removal of other > species sensitive > > > > > to the allelopathic chemicals (this is the most likely > case, but no > > > > proof). > > > > > > > > Lee > > > > > > > > DON BERTOLETTE wrote: > > > > > > Lee/Mike- > > > > > > In my time wandering through Kentucky woods, black > walnut trees were > > > > > > the only thing I saw that could alter the advance of a > field of poke > > > > > > salat! > > > > > > My question? What would negative allelopathic refer to? > I can see > > > > > > that it would be positive in this case for black walnut > and negative > > > > > > to most anything else, but I suspect it may refer to > something else > > > > > > entirely? > > > > > > -Don > > > > > > > > > > Date: Thu, 24 Sep 2009 07:50:26 -0500 > > > > > > > From: [email protected] <mailto:[email protected]> > > > > > > > To: [email protected] > <mailto:[email protected]> > > > > > > > Subject: [ENTS] Re: Marion Brooks Natural Area, Elk > County, PA > > > > > > > > > > Mike: > > > > > > > > > > We had a discussion a while ago on this topic, > probably before > > > > you were > > > > > > > on the list. Black walnut and butternut produce the > allelopathic > > > > > > > chemical juglone, which can stunt growth or even kill > certain plant > > > > > > > species, although I have seen raspberries and a species of > > > > coneflower > > > > > > > (Rudbeckia triloba, the branched coneflower), growing > under black > > > > > > walnut > > > > > > > trees. > > > > > > > > > > Sugar maple and bracken fern have also been found to > produce > > > > > > > allelopathic chemicals that reduce germination and > growth of > > > > competing > > > > > > > plants. There are probably many other examples. > > > > > > > > > > Lee > > > -- > Ryan McEwan > The University of Dayton > http://academic.udayton.edu/RyanMcEwan > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ Eastern Native Tree Society http://www.nativetreesociety.org Send email to [email protected] Visit this group at http://groups.google.com/group/entstrees?hl=en To unsubscribe send email to [email protected] -~----------~----~----~----~------~----~------~--~---
