Ryan, The scar reminds me of a Nectria infection, but I'm no forest pathologist. I can't see enough of the bark to be confident abount an id.
Jess On Wed, Sep 30, 2009 at 1:54 PM, Ryan McEwan <[email protected]> wrote: > 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]> > 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] >> > To: [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]> 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] >> > > > > To: [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] >> > > > > > > To: [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] -~----------~----~----~----~------~----~------~--~---
