North American Fruit Explorers mailing list at ibiblio

[Sarah Kehler Ewing <skkewing@yahoo.com>]

That certainly correlates with what we see up here: grafting wood gathered in 
February (which is already after the coldest weather we get) always has way 
healthier/alive buds than that gathered in April.  The explanation is spring 
bud kill due to weather fluctuations between very warm and then very cold.

Sarah 
zone 3
Edmonton, AB


--- On Wed, 3/3/10, Alan Haigh <alandhaigh@gmail.com> wrote:

> From: Alan Haigh <alandhaigh@gmail.com>
> Subject: [NAFEX] Cambium damage in Z 3
> To: nafex@lists.ibiblio.org
> Received: Wednesday, March 3, 2010, 11:48 AM
> Jim, I'm wondering if what you
> describe isn't just weather related cambium kill.  My
> insights on this issue are anecdotal only, but I do know
> that it's pretty hard to keep track of conditions that
> may lethally freeze the cambium due to all the variables,
> including the level of dormancy, length of exposure, wind
> conditions and so forth.  
> 
>  
> I've mentioned on this site that last year I lost
> 3 apricots after a relatively mild winter at 2 of the most
> favorable sites I manage them, being right next to the
> Hudson River not more than 40 miles north of NY City.  My
> hunch is just that they were further out of dormancy than
> apricot trees at other sites when a hard spring frost hit
> all areas where I grow them.  I've come to the
> conclusion that here most of my weather related cambium kill
> must occur in the early spring because there is no
> correlation between these incidents and extreme winter
> weather.  In zone 3 there would probably be a completely
> different dynamic, but I thought this might be
> helpful.
> 
>  
>   Jim Fruth wrote  "What can you tell me about
> bark disease?  The bark looks normal until
> the day I notice that it has sunk inward.  When I pull
> away the outer bark,
> the inner bark seems absent (or shriveled?)  It
> doesn't girdle the tree but
> 
> so little live bark is left that the live bark can no
> longer sustain the
> tree and the tree dies the following year.  It isn't
> sun-scald as the
> problem occurs on the north side too.  No (obvious)
> evidence of insects.  My
> 
> zone 3 peach died this way and now my McIntosh Apple has
> it."
> 
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