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nafex - Re: [NAFEX] scion rooting

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  • From: "Lon J. Rombough" <lonrom@hevanet.com>
  • To: North American Fruit Explorers <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] scion rooting
  • Date: Wed, 22 Apr 2009 17:33:34 -0700

Personal anecdote: I deliberately buried the unions of several pears one time to try for scion rooting. The soil was very heavy clay and pear is supposed to handle clay better than quince. Some years later I had to dig the trees out and none had any scion rooting.
-Lon Rombough
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Grapes, writing, consulting, my book, The Grape Grower, at http://www.bunchgrapes.com Winner of the Garden Writers Association "Best Talent in Writing" award for 2003.
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On Apr 22, 2009, at 5:22 PM, Mark Angermayer wrote:

Very interesting thought Alan.  Can you explain the mechanics a bit more?  Is he saying roots simply won't form above the graft?  I have found this true on peach (in other words peaches most definitely won't form roots above the graft) but found roots will form above the graft on apple and plum.
 
Mark
KS
<x-tad-bigger>----- Original Message -----</x-tad-bigger>
<x-tad-bigger>From:</x-tad-bigger><x-tad-bigger> Alan Haigh</x-tad-bigger>
<x-tad-bigger>To:</x-tad-bigger><x-tad-bigger> </x-tad-bigger><x-tad-bigger>nafex@lists.ibiblio.org</x-tad-bigger><x-tad-bigger> </x-tad-bigger>
<x-tad-bigger>Sent:</x-tad-bigger><x-tad-bigger> Wednesday, April 22, 2009 5:12 PM</x-tad-bigger>
<x-tad-bigger>Subject:</x-tad-bigger><x-tad-bigger> [NAFEX] scion rooting</x-tad-bigger>

As I was examining some root growth today off of some seedling apple trees I started thinking about the issue of scion rooting off of too deep planted trees.  In Harold Tukey's book "Dwarfed Fruit Trees" he wrote something that I found very surprising and that was that the vast majority of apple varieties to not tend to dedifferentiate cell structure to where root primordia will form from non-root tissue.  In other words- planting apples below the graft rarely leads to a loss of dwarfing from the rootstock as a result of scion rooting.
 
This contradicts so much of what I've read over the years but Harold Tukey was clearly well qualified to make his statement and wouldn't have done so if he wasn't quite sure it was valid.  I have seen at least one fairly large commercial orchard where many of the M7 and 106 trees were planted below the graft union to no apparent negative affect- 13 foot spacing between trees- 20 ft between rows.
 
Thought I'd throw this out there to open a discussion.  I know some varieties of apples easily root out from scion wood such as Northern Spy which create root primordia all over the branches but I was wondering if others have observed scion rooting as being extremely common.
 
He also stated in this book that early American pear growers outside of Boston used to make quince work in their cold climate as a rootstock for pear by planting it deep enough to be insulated from winter cold.  Another case where scion rooting was apparently not a problem.

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