Forgive me if I treat the subject of pruning too cavalierly, but I am scheduled 
to give a brief lecture on the various theories.
One of them is apical dominance, which I am left wondering about---is it still 
regarded as a valid consideration in pruning?

Another theory was encapsulated by a NH grower, who, when asked by a group of 
trainees:  Mr Elwood, why did you cut off that branch?----he replied:  " I was 
TIRED of looking at it."  Not a totally useless pruning principle, but how is a 
beginner supposed to follow it?
So---the Tiresome Branch Theory of pruning.  
On Tue, 3/21/17, Juliet Evelyn Carroll <> wrote:

 Subject: RE: [Apple-Crop] Pruning cuts
 To: "Arthur Harvey" <>, "Apple-Crop discussion list" 
 Date: Tuesday, March 21, 2017, 3:31 PM
 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.
 Juliet E. Carroll, PhD
 IPM Coordinator, New York State Integrated Pest Management
 (IPM) Program
 Cornell University, 630 W.
 North St., Geneva, NY 14456
 (Fax -2360),
 Cornell Cooperative Extension provides equal
 program & employment opportunity
 Diversity and inclusion are a part of Cornell
 University’s heritage
 From: apple-crop []
 On Behalf Of Arthur Harvey
 Sent: Tuesday,
 March 21, 2017 2:54 PM
 To: Apple-Crop
 discussion list <>
 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 <>
  Subject: Re:
 [Apple-Crop] Pruning cuts
 "Apple-Crop discussion list" <>
  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 <>
  We have
  made some large cuts,
 4-6" seems like some latex paint
 be helpful (apples). 
  Realize standard
 advice says no
  But ready for advice.
  77 tues
  forecast 15 tomorrow night in central Iowa.
 Regards, Dean
  apple-crop mailing
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