North American Fruit Explorers mailing list at ibiblio

["David Doud" <doudone@netusa1.net>]

 ...Should I be alarmed?...

nothing to do,  so worry about something on which you can act....
...there are different kinds of cold damage - - most 'winter injury'
involves moisture in tissue,  pruning cuts compromise the tree's plumbing,
affecting its ability to move water into and out of tissue - - the bigger
the cuts,  the more likely the injury,  IMO dwarf trees tend to be more
tender because
1.  common dwarfing rootstocks come from less extreme climates than we have
in the US
2.  they are less robust by their nature
3.  a modest pruning (which is unlikely to cause trouble except in extreme
circumstances) involves a bigger percentage of the canopy of  a dwarf tree
as compared to a modest pruning of a larger tree,  therefore having a larger
effect on the system

hey,  likely everything will be fine - -






----- Original Message -----
From: "Jason MacArthur" <rotread@localnet.com>
To: <nafex@lists.ibiblio.org>
Sent: Friday, March 04, 2005 4:27 PM
Subject: [NAFEX] Dormant Pruning of apples


> I am curious as to the mechanism by which cold damages recently pruned
> fruit trees, in my case apples.  Is there a growth response to the
> pruning cut which forms susceptible tissue?  Does this growth response
> happen even if temperatures remain cold or is it a warming cooling
> cycle which causes the damage? I have read that less vigorous
> rootstocks are more vulnerable- why is this?
> I foolishly went ahead and pruned my dwarf apples in late February,
> and now the temperatures are plunging below 0 F at night.  Should I be
> alarmed?  There is nothing I can do but wonder, which has led me to
> this question.
>
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