North American Fruit Explorers mailing list at ibiblio

["Hector Black" <hblack1925@fastmail.fm>]

I had always thought that water by giving off heat when it freezes, would 
protect.  The problem we experienced in the freeze of 2007 April was that we 
turned on the irrigation to protect our blueberries but the temp. went so 
low (into the teens) that the ice was hanging from the bushes and the 
sprinklers stopped because of ice accumulation.  What surprised me was that 
the branches froze back - it wasn't just bud damage, but sometimes 6-10 in. 
of branch was killed.  This made me wonder if water is only good up to a 
certain temp. and then it may do more harm than good.  It seems to have in 
our blueberries.  The bushes with the least water (ice)  were the least 
damaged.

Hector Black zone 6 middle TN
----- Original Message ----- 
From: "Ernest Plutko" <ernestplutko@wiktel.com>
To: <nafex@lists.ibiblio.org>
Sent: Tuesday, March 31, 2009 11:35 AM
Subject: Re: [NAFEX] heat tape


> Bud tissue freezes a degree or two below the freezing point of water
> because of the sugars and other organics in the buds.  A coating of
> ice would hold the bud temp at 32 F for some time when the air temp
> goes below 32 F. This does protect buds as I saw when I lived in
> Michigan.
>
> ---- Original Message ----
> From: hangermayer@isp.com
> To: nafex@lists.ibiblio.org
> Subject: Re: [NAFEX] heat tape
> Date: Tue, 31 Mar 2009 11:07:46 -0600
>
> > Hi Ernest,
> >
> > Yes, I know that.  What I remember reading though is that water
> > already
> > frozen on the tree when the low temps hit, somehow protects the buds.
> > Since
> > the water would be already frozen, they wouldn't give off any heat,
> > but
> > still, it offers some protection.  Don't know why though.
> >
> > Mark
> > KS
> > ----- Original Message ----- 
> > From: "Ernest Plutko" <>
> > To: <nafex@lists.ibiblio.org>
> > Sent: Tuesday, March 31, 2009 9:53 AM
> > Subject: Re: [NAFEX] heat tape
> >
> >
> > > Freezing water does protect buds.  When water freezes the water
> > > molecules stop moving and release energy (as heat) when the water
> > > molecules connect together to form ice.
> > > ---- Original Message ----
> > > From:
> > > To: nafex@lists.ibiblio.org
> > > Subject: Re: [NAFEX] heat tape
> > > Date: Tue, 31 Mar 2009 10:41:39 -0600
> > >
> > > >We had a narrow miss here last weekend.  Days earlier, weathermen
> > > >were
> > > >calling for a low of 18F.  With some peach trees in full bloom, it
> > > >wasn't
> > > >looking good.  I contemplated some ways to try to minimize fruit
> > > >loss.  But
> > > >I have the same problem as Bill.  When these cold fronts blow
> > > >through, the
> > > >wind is pretty fierce, and really limits your options.  Covering
> > any
> > > >trees
> > > >is out of the question.  And I question whether sprinklers would
> > work
> > > >with
> > > >20-25 mph winds. I have sprayed potassium lactose before (can't
> > say
> > > >from my
> > > >own experience whether it's effective or not, but some people
> > swear
> > > >by it)
> > > >but it gets pretty hard to spray in strong winds.  It turns out we
> > > >got a
> > > >good bit of freezing rain, which left about 1/4" of ice on the
> > trees.
> > > > The
> > > >temps only got down to 24.6F.  Strangely, I can't tell that any of
> > > >the
> > > >blooms died.  At that temp, there should have been 90% bloom kill,
> > > >according
> > > >to the charts.  I've read before ice can protect buds, but I've
> > > >forgotten
> > > >how it does it.  Anyone want to refresh my memory?
> > > >
> > > >Mark
> > > >KS
> > > >----- Original Message ----- 
> > > >From: "William C. Garthright" <>
> > > >To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
> > > >Sent: Monday, March 30, 2009 8:43 PM
> > > >Subject: Re: [NAFEX] heat tape
> > > >
> > > >
> > > >>
> > > >> > A while back I read a summary of some prof. at MU trying to
> > delay
> > > >blossom by spraying the whole tree with a dilute latex paint/water
> > > >mix.  The
> > > >idea was to keep the sun off the buds as well as the trunk.  Can't
> > > >remember
> > > >how long it supposedly delayed bloom, but I'm thinking it was a
> > weeks
> > > >delay.
> > > >> >
> > > >>
> > > >>
> > > >> Interesting, Mark. I might try that next year. I did wonder when
> > I
> > > >> painted the trunks how far up I was supposed to go.
> > > >>
> > > >> And my neighbors think I'm loony already, so I might as well go
> > all
> > > >the
> > > >way.
> > > >>
> > > >> :-)
> > > >>
> > > >> Bill
> > > >> Lincoln, NE (zone 5)
> > > >>
> > > >> -- 
> > > >> Diplomacy is the art of saying "Nice doggie" until you can find
> > a
> > > >rock.
> > > >> - Will Rogers
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