[NatureNS] White Birch Recovery

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Date: Sat, 23 Sep 2006 10:27:06 -0700 (PDT)
From: Paul MacDonald <paulrita2001@yahoo.com>
To: naturens@chebucto.ns.ca
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Hi Dave and All
Along the Rails to Trails I have seen an unusual
number of birch seedlings the last couple of years.
Looks like a lawn. Probably the wet summer also
Have a nice fall
Paul

--- David & Alison Webster <dwebster@glinx.com> wrote:

> Dear All,                    Sept 23, 2006
>     Further to a previous post--
> ||||||||||||||||||||||||||||||||||||||||||||||
> Hi  Brian, Richard & All,            Sept 19, 2004
>     This is probably unrelated, apart from
> involvement of the same tree 
> species, but numerous White Birch in the Kentville
> area are now affected 
> by a dieback that starts in the tops/branch ends and
> works 
> downward/inward over several years. From the
> progression of symptoms I 
> suspect it is caused by xylem blockage by fungi or
> bacteria that gained 
> a toe-hold by invading roots killed by water stress
> in a series of dry 
> summers.
> ||||||||||||||||||||||||||||||||||||||||||||||
> 
> --and following two summers of adequate or ample
> rainfall (2005 & 2006), 
> many of the Birch trees that were in serious decline
> by 2004 are in 
> recovery mode. This is consistent with dry summers
> being a major cause 
> of the previous decline.
> 
> Yours truly, Dave Webster, Kentville
> 
> 
> 
> 


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