North American Fruit Explorers mailing list at ibiblio

[david liezen <chandos49@hotmail.com>]

Steve,

 I remember reading "The Grafter's Handbook" printed in Britain some decades 
ago (and cannot find in my list of reading over the past 7 years, although it 
was within that time) that over a matter of several years apple roots 
developing from the scion, when burying the graft union, will supersede those 
from the root stock. In most cases, the root stock eventually dwindles away. 
Plenty of factors determine how fast or slow that change takes place.
 They recommended this technique in some cases where fruiting would be more 
precocious due to the influence of the root stock, and later the tree will 
develop standard size and fruiting. 

 Not all cultivars exhibit the same hardiness, drought resistance, disease 
resistance and such as the root stocks they have been grafted to, so that 
would be worth considering. And the reverse may be true. Some, like Lubsk 
Queen or Duchess of Oldenburg, may well be more hardy then most root stocks. 

 As to prunus and other species, I bow to others with more knowledge and 
experience.

Dave Liezen


----------------------------------------
> Date: Fri, 31 May 2013 01:46:28 -0500
> From: sherwindu@att.net
> To: nafex@lists.ibiblio.org
> Subject: Re: [nafex] Burying graft union; scion will root?
>
> On 5/30/2013 11:19 PM, Steven Covacci wrote:
>> Hi,
>>
>>
>> I've started a practice of burying the graft-unions (2" bellow ground) of 
>> trees grafted unto seedling rootstocks of like species (i.e. P. cerasus on 
>> P. cerasus) - as long as the sapling is of 1" or less caliper. I haven't 
>> had he scions root in these cases yet one and two years later (dogwood 
>> tree types, plums, peaches, apricots and sour-cherries).
>>
>>
>> Rationale: to eliminate just an unnecessarily source for borers to enter 
>> and the fact that there is always a degree (minute or not) of 
>> incompatibility between the scion and the understock - even in cases where 
>> they are both of like species and even subspecies.
>>
>>
>> Do you believe that the scion portion that is buried will root? If so, 
>> will both resulting rootsystems collectively persist (that of the scion in 
>> the upper portion of the soil, and that of the rootstock in the lower 
>> portion - being the original root mass)? Might the tissue of the scion 
>> (trunk) be past the point of being able to produce roots due to advanced 
>> development beyond being in the seedling stage?
>>
>>
>> Thank you,
>>
>>
>> Steve NJ
>>
>>
>>
> Steve,
>
> Most likely, the scion will develop roots and may kill the
> roots of the rootstock. At that point,
> the tree loses it's dwarfing characteristic and the benefits of
> a strong root system of the original
> rootstock. If you are going to do what you propose, why not
> just graft your scion onto a standard
> rootstock and forget about growing dwarf trees. Scions can
> take root at any time, if you put them
> in contact with the soil.
>
> I don't understand your logic about the borers. They don't
> necessarily prefer to enter a tree at the
> graft union.
>
> Sherwin Dubren, IL
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