Apical dominance has to do with leaves and green shoots, not wood. The cambium 
produces wood (xylem) to the interior and "bark" (phloem) to the exterior. The 
cork cambium layer, which is outside the phloem, produces the actual flaky and 
tree-species-distinctive outer bark on the trunk. Having leaves and shoots 
above the large pruning cut provides carbohydrate for the growth of the callous 
and eventual xylem and phloem around the large cut surface. Water goes up 
through the xylem and photosynthate travels down through the phloem. The 
photosynthate feeds the living tissue around the pruning cut, hastening healing.
Julie
Juliet E. Carroll, PhD
Fruit IPM Coordinator, New York State Integrated Pest Management (IPM) Program
Cornell University, 630 W. North St., Geneva, NY 14456
315-787-2430 (Fax -2360), j...@cornell.edu
Cornell Cooperative Extension provides equal program & employment opportunity
Diversity and inclusion are a part of Cornell University’s heritage




-----Original Message-----
From: apple-crop [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of 
Arthur Harvey
Sent: Tuesday, March 21, 2017 2:54 PM
To: Apple-Crop discussion list <apple-crop@virtualorchard.com>
Subject: Re: [Apple-Crop] Pruning cuts

Not to doubt the advice regarding  "foliage feeding the cut from above"----but 
how does that relate to the theory of apical dominance we used to hear about?
--------------------------------------------
On Tue, 3/21/17, David Kollas <kol...@frontier.com> wrote:

 Subject: Re: [Apple-Crop] Pruning cuts
 To: "Apple-Crop discussion list" <apple-crop@virtualorchard.com>
 Date: Tuesday, March 21, 2017, 11:13 AM
 
 Dean:  I use Doc Farwell’s Seal
 and Heal (green) or the similar Doc Farwell’s Grafting  Seal on cuts thatI 
think will not  heal over within two or three years if they do not slope enough 
to shed  rain over theraised lip of new growth.  Wood  rot develops on wounds 
that provide wet conditions favorable  to decay. Large cuts made  to permit 
grafting do not heal rapidly if there is no  foliage feeding the cut fromabove. 
Observe temperature limitations  on the label.
 David KollasKollas OrchardTolland, CT  On Mar 9, 2017, at
 2:47 PM, Dean <d...@berrypatchfarm.com>
 wrote:
 We have
 made some large cuts,
 4-6" seems like some latex paint
 would be helpful (apples). 
 Realize standard advice says no
 But ready for advice.
 Thanks
 77 tues
 forecast 15 tomorrow night in central Iowa. 
 
 
 Regards, Dean
 Www.berrypatchfarm.com
 
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