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[Matthew Oller <matthewoller@yahoo.com>]

Thanks, Sarah. I went through Edmonton in '91 on my way to Inuvik. Even at 30.5 latitude , anold way of retarding bloom is to dig 3 holes, and put blocks of ice in each. I believe it is to reduce soil temp.matt,peace

--- On Tue, 3/31/09, Sarah Kehler Ewing <skkewing@yahoo.com> wrote:

From: Sarah Kehler Ewing <skkewing@yahoo.com>
Subject: Re: [NAFEX] Painting trees to prevent sunscald
To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
Date: Tuesday, March 31, 2009, 10:30 AM

Hi Matt,

Yes it is.  In northern regions the sun is so low on the horizon all winter that it strikes the trees almost perpendicularly to their trunks.  The result is that the tree bark warms up and the sap gets flowing while the sun is on it and then the sap freezes when the sun goes down splitting the bark open.  A few repeats of this and your tree is very damaged.  Local Birch trees have been known to have 1" wide cracks that flow freely with sap in the spring, but for some reason it doesn't seem to bother them as much as it bothers the fruit trees.

I read in a very old fruit tree book that an alternative to painting tree trunks used to be merely planting the tree with a 23 degree tilt towards the sun thus preventing the perpendicular sun strike!


Sarah
zone 3
Edmonton, AB


--- On Tue, 3/31/09, Matthew Oller <matthewoller@yahoo.com> wrote:

> Helene, I thought it was , also to
> reduce cracking, from extreme temperature changes,and
> primarily on the south sides of trees,no?, matt,peace
>


     

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