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Re: [nafex] Re: Pruning and Growth
Hi,
What I have read indicates that 75% of sprout and suckering growth occurs
in the spring.
Whether this is a result of pruning or just the natural cycle I do not
know.
I know that I read that bit of information in regards to chemicaly
ihibiting this growth till the spring growth spurt was over.
Later,
Tom
--
On Tue, 16 Apr 2002, crmauch wrote:
> The "Lorette System" of pruning is effectively summer pruning that is
> supposed to reduce tree size, and increase flowering.
>
> Chris Mauchline
> SE PA, zone 6
>
> --- In nafex@y..., "Raby, Brian {D204~Indianapolis}"
> <BRIAN.RABY@R...> wrote:
> > All,
> >
> > This conversation stimulated me to go through some of my college
> books (1979
> > to1982) to check up on the subject.
> >
> > According to what I've read, the auxin produced in the growing tip
> of most
> > apple trees produces ethylene that translocates to the lower buds
> on the
> > branch preventing growth. Either an application of Cytokinins, or
> scoring
> > just above a bud you wish to break (which basically prevents the
> downward
> > travel of the ethylene to the bud) causes side branches to grow.
> It is a
> > very difficult topic to explain via e-mail.
> >
> > A great source of pruning, growth hormones and the like are in a
> probably
> > obscure 1981 shortcourse proceeding that I purchased back in 1982.
> It is
> > called "Tree Fruit Growth Regulators and Chemical Thinning", edited
> by
> > Ronald B. Tukey and Max Williams. To compliment your response Don,
> Dr.
> > David Ferree writes on page 100 "Pruning in August after terminal
> bud set
> > has been shown by several investigators to improve fruit color,
> increase
> > fruit calcium, decrease cork spot, and promote the development of
> stronger
> > and more fruitful spurs in the older section of the branches."
> He also
> > writes that researchers in Indiana have utilized summer pruning as
> a means
> > of dwarfing peach tree to permit high density plantings. It
> consists of
> > mechanically shearing new growth on the tree periphery in half about
> > mid-June. The shoots grow and again are cut in half in mid-July
> with little
> > regrowth occurring. It resulted in yields of nearly 500 bushels
> per acre on
> > 3 yr. old Redhaven trees in an Ohio study. This mechanical pruning
> in tart
> > cherries in Michigan also results in increased fruit size and
> sustained
> > yields.
> >
> > Here's another insert I found interesting; scoring. Here's how Dr.
> Ferree
> > describes it:" Scoring (a circumscribing cut through the bark but
> not into
> > the wood) is a technique that fits somewhere between training and
> pruning.
> > Scoring the trunk 2 weeks after bloom results in a growth reduction
> similar
> > to that achieved by Alar and ethephon and has proven more
> consistent in
> > promoting flower initiation than these chemicals. Scoring acts by
> > interrupting phloem translocation which causes a buildup of the
> carbohydrate
> > products of photosynthesis in the branch portion above the cut.
> Growth
> > hormones produced in the apical meristems and young leaves are
> translocated
> > in the phloem (which transports products downward in a plant) and
> thus also
> > play a role in the effects produced by scoring. The photosynthetic
> and
> > transpiration rates of leaves above the cut are reduced for up to 2
> weeks
> > but recover to control levels of unscored plants in 4 weeks." He
> goes on a
> > says "Since scoring requires less than 1 minute/tree, it is a sound
> practice
> > economically and should be considered on young trees where a
> slowdown of
> > growth and an increase in flower initiation is desired (I have a
> few trees
> > like that). He warns, however, that scoring does increase the risk
> of
> > fireblight damage and winter injury in the scored section of the
> trunk.
> >
> > Ed, my question to you is does all of this make sense to you or is
> it all
> > "old school"? I've been away from the trade too long to know what
> the
> > common practices are to help promote flower initiation.
> >
> > Thanks for letting me bend your ear (and eyes) a bit.
> >
> > Brian
> > Sheridan, IN
> >
> >
> > -----Original Message-----
> > From: Don Yellman [mailto:dyellman@e...]
> > Sent: April 13, 2002 8:46 PM
> > To: nafex@y...
> > Subject: [nafex] Pruning and Growth
> >
> >
> > Tom:
> >
> > Agree with Ed. It seems to me the answer is selective pruning
> conducted
> > throughout the growing season. This can also assist formation of
> > fruiting wood in otherwise reluctant trees. Then you won't have to
> > worry about auxins and cytopathic hormones, which are difficult to
> see
> > and even harder to train. The trees I have summer pruned here are
> > blooming much more profusely than those I have not, and are
> otherwise
> > just as healthy. I managed to shock a 12-year old Early Cortland
> that
> > had never really bloomed by some pretty severe pruning last August.
> > This spring it is covered with blooms.
> >
> > Rgds, Don Yellman, Great Falls, VA
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
>
>
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