North American Fruit Explorers mailing list at ibiblio

["Mark & Helen Angermayer" <hangermayer@isp.com>]

Anton,

Why would switching to "own rooted trees for new plantings" increase uptake
of available calcium?  Also, how is a peach tree grown on it's own roots?
I've never seen peach trees advertised other than on commercial rootstocks
(Bailey, Halford, Lovell).  Do you mean burying the peach tree below graft?
How successful is this in causing the peach tree to root out?

Mark
KS

----- Original Message ----- 
From: "Anton Callaway" <>
To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
Sent: Thursday, November 15, 2007 5:38 AM
Subject: Re: [NAFEX] brown tor resistance, was: Plum Curculio Resistant
Cultivars


> Resistance to brown rot in peaches is very interesting.  I'd love to hear
more details about this Brazilian peach and the mechanism of resistance.
For instance, is the rubbery flesh a coincidental phenotype or is it part of
the resistance mechanism?  Does this resistance hold up even when curculio
control is less than complete?
>
> About split pit:
> Thinning, especially early thinning of early peaches leads to dramatic
increases in fruit size.  The increase in fruit size increases the distance
calcium must travel to the developing pit, where it is needed for proper
hardening.  Early peaches are especially prone because the development
happens so rapidly that calcium transport must be especially efficient.  The
studies I've seen on effective methods to reduce split pit recommend
increasing calcium availability to the trees, by soil amendments and foliar
spraying of chelated calcium and by switching to own-rooted trees for new
plantings.  Calcium chloride should work to some degree in foliar sprays and
it is cheaper and more easily found.  However, the chelated calcium was the
most effective.  The tested forms of chelated calcium included acetate,
lactate and gluconate.
>
> Anton
> Zone 8
> It's finally raining!!! (a little bit)
>
> -----Original Message-----
> >From: Douglas Woodard <dwoodard@becon.org>
> >Sent: Nov 14, 2007 5:00 PM
> >To: North American Fruit Explorers <nafex@lists.ibiblio.org>
> >Subject: Re: [NAFEX] brown tor resistance, was:  Plum Curculio Resistant
Cultivars
> >
> >Some years ago the Pomona had an item about a Brazilian peach which is
> >resistant to brown rot. I talked about it to a breeder at the Vineland
> >station near me. He told me that they were doing breeding of canning
> >peaches with its pollen which they had obtained from California where
> >there was an active breeding program using the Brazilian peach. He also
> >said that they were only working on canning peaches because the
> >Brazilian peach was a rubbery fleshed type which would need several
> >generations to get the brown rot reistance into a good quality fresh
> >eating freestone peach. I haven't heard anything about this work since.
> >
> >I have been told by a grower that thinning peaches when the pit is still
> >jelly-like results in the pit rotting quickly on the orchard floor and
> >not carrying the brown rot infection over to the next year (at least
> >from that source). If you thin when the pit has hardened it does not rot
> >away completely and will carry the infection to the next year. This
> >makes the thinning of very early peaches difficult; apparently if you
> >thin early you get more split pits  - harbouring rot and unsaleable -
> >which earlies are prone to anyway.
> >
> >I believe the Harrow apricots were also selected for brown rot
> >resistance to a degree.
> >
> >Alan Haigh wrote:
> >[snip]
> >>
> >> I'm also curious about brown-rot resistance in stone-fruit.  This is
> >> going to be very regionally specific, I'm afraid, but maybe we can all
> >> learn something.  I have read that the Seneca plum is resistant but not
> >> found this to be true.  I have observed that in peaches older varieties
> >> seem to have more resistance.  Encore, Autumn Glo and Lady Nancy tend
to
> >> rot without significant protection but Elberta and Belle of Georgia do
not.
> >>
> >> In southeastern NY earlier ripening stone-fruit that face less heat and
> >> humiditity suffer less from brown-rot and peaches less from scab.
> >> So many of the newer peaches are highly susceptible to brown-rot that I
> >> think we should limit the discussion to what's resistant, not what's
> >> not, unless it's a variety that seems to exist to rot.  In newer
> >> peaches, varieties from the Harrow series are evaluated for brown-rot
> >> resistance but they are falling out of popularity.
> >
> >[snip]
> >_______________________________________________
> >nafex mailing list
> >nafex@lists.ibiblio.org
> >
> >Reproduction of list messages or archives is not allowed.
> >This includes distribution on other email lists or reproduction on web
sites.
> >Permission to reproduce is NEVER granted, so don't claim you have
permission!
> >
> >**YOU MUST BE SUBSCRIBED TO POST!**
> >Posts from email addresses that are not subscribed are discarded.
> >No exceptions.
> >----
> >To subscribe or unsubscribe, go to the bottom of this page (also can be
used to change other email options):
> >http://lists.ibiblio.org/mailman/listinfo/nafex
> >
> >File attachments are NOT stripped by this list.
> >TAKE STEPS TO PROTECT YOURSELF FROM COMPUTER VIRUSES!
> >Please do not send binary files.
> >Use plain text ONLY in emails!
> >
> >NAFEX web site:   http://www.nafex.org/
>
> _______________________________________________
> nafex mailing list
> nafex@lists.ibiblio.org
>
> Reproduction of list messages or archives is not allowed.
> This includes distribution on other email lists or reproduction on web
sites.
> Permission to reproduce is NEVER granted, so don't claim you have
permission!
>
> **YOU MUST BE SUBSCRIBED TO POST!**
> Posts from email addresses that are not subscribed are discarded.
> No exceptions.
> ----
> To subscribe or unsubscribe, go to the bottom of this page (also can be
used to change other email options):
> http://lists.ibiblio.org/mailman/listinfo/nafex
>
> File attachments are NOT stripped by this list.
> TAKE STEPS TO PROTECT YOURSELF FROM COMPUTER VIRUSES!
> Please do not send binary files.
> Use plain text ONLY in emails!
>
> NAFEX web site:   http://www.nafex.org/
>
>
>
> -- 
> Internal Virus Database is out-of-date.
> Checked by AVG Free Edition.
> Version: 7.5.486 / Virus Database: 269.15.24/1115 - Release Date: 11/7/07
9:21 AM
>