North American Fruit Explorers mailing list at ibiblio

["Lon J. Rombough" <lonrom@hevanet.com>]

Kirk:
    I started to set up such an experiment one time when I worked at a
nursery, but the job was short lived (the owner turned out to have the
ethics of a cow pie) so I don't know how it did.
  FWIW, here is a method used at the NCGR to get own-rooted Corylus.  This
involves grafted varieties they want to get growing on their own roots.  The
trees are in pots.  Early in the growing season, a wire twist tie is put
tightly around the scion just above the graft and the girdled area is
painted with rooting hormone.  A black plastic sleeve about 4 -6 inches in
diameter is put over the tree and filled with baked sawdust.  It sits on top
of the soil in the pot.  It is kept that way all season and the trees are
kept in greenhouses or someplace where the temperatures is airly constant,
for better growth.  When the tree is dormant in the fall, the sleeve is
removed and the rooted scion is cut loose and planted.  Often, there is
enough scion left that it can be allowed to re-sprout and the process
repeated, if desired.
I hope your project works out.
-Lon
----------
>From: "Kirk W. Pomper" <kpomper@dcr.net>
>To: nafex@egroups.com
>Subject: Re: [nafex] Pawpaw
>Date: Thu, Jun 29, 2000, 7:21 AM
>

>Lon:
>
>I have been unable to find any information concerning the propagation of
>pawpaw via layering. Therefore, I submitted a grant proposal this spring to
>pursue the development of mound layering as a clonal propagation method for
>pawpaw. I have also started a small mound layering experiment in the field
>this spring. If we can successfully develop this propagation technique with
>pawpaw, we could use it to propagate clonal rootstock and KSU advanced
>selections. I hope to find out if  the proposal will be funded sometime in
>July or August.
>
>Kirk
>--
>Kirk W. Pomper, Ph.D.
>Principal Investigator of Horticulture
>Kentucky State University
>129 Atwood Research Facility
>Frankfort, KY 40601
>
>Phone: 502-227-5942
>Fax:     502-227-6381
>Email: kpomper@dcr.net                  Check out our web site at:
>or kpomper@gwmail.kysu.edu             http://www.pawpaw.kysu.edu
>
>>
>>
>"Lon J. Rombough" wrote:
>
>> Kirk:
>>     Has anyone done anything there with layering pawpaw?  I learned an
>> interesting version of air layering at the NCGR in Corvallis, used for
>> Corylus, that might work on pawpaw.
>> -Lon Rombough
>> ----------
>> >From: "Kirk W. Pomper" <kpomper@dcr.net>
>> >To: nafex@egroups.com
>> >Subject: Re:[nafex] Pawpaw
>> >Date: Wed, Jun 28, 2000, 8:48 AM
>> >
>>
>> >
>> >I thought I would summarize some of the work that has been done here at
>> >Kentucky State University by Cindy Finneseth and Desmond Layne, in
>> >cooperation with Robert Geneve at the University of Kentucky on
>> >propagating pawpaw (Asimina triloba) via cuttings:
>> >
>> >1) Semi-hardwood cuttings
>> >
>> >Semi-hardwood cuttings were collected from mature trees (5 years old,
>> >flowering) at the KSU Research Farm; more than 26 genetically different
>> >trees were used in the study. The cuttings were taken from actively
>> >growing branches from June until terminal bud set in early August. IBA
>> >was used as the rooting treatment, with quick dip solutions at
>> >concentrations of 0, 5000, and 10,000 ppm. After auxin application, the
>> >cuttings were stuck in flats filled with a 1:1 moistened mixture of
>> >Promix and perlite.  Flats were placed on raised benches in a
>> >poly-covered greenhouse and a soil temperature was maintained at 80 F
>> >using a hot water bottom-heated system.  Continual intermittent mist was
>> >provided for 5 seconds every 5 minutes. Only 1 of 5100 cuttings from
>> >mature tree
>> >sources formed an adventitious root.
>> >
>> >2) Root Cuttings
>> >
>> >We have taken root cuttings from dormant trees in February and placed
>> >the
>> >cuttings 5 cm deep, in flats filled with a 1:1 mixture of perlite and
>> >vermiculite.  No shoots formed on root pieces less than 5 mm in diameter
>> >
>> >over the 24 week period; however, buds and/or shoots were present on 56%
>> >of
>> >the root pieces with a diameter of greater 5 mm within 16 weeks. Healthy
>> >plants can be clonally propagated via root cuttings that produce shoots;
>> >however, we have had trouble with root cuttings rotting in the flats and
>> >killing the plants. The clonal propagation of pawpaw rootstock via root
>> >cuttings does look promising. Unfortunately, virtually all currently
>> >available pawpaw cultivars have been propagated via grafting or budding
>> >and are no longer on their own roots.
>> >
>> >Kirk Pomper
>> >--
>> >Kirk W. Pomper, Ph.D.
>> >Principal Investigator of Horticulture
>> >Kentucky State University
>> >129 Atwood Research Facility
>> >Frankfort, KY 40601
>> >
>> >Phone: 502-227-5942
>> >Fax:     502-227-6381
>> >Email: kpomper@dcr.net                  Check out our web site at:
>> >or kpomper@gwmail.kysu.edu            http://www.pawpaw.kysu.edu
>> >
>> >
>> >
>> >
>> >--
>> >Kirk W. Pomper, Ph.D.
>> >Principal Investigator of Horticulture
>> >Kentucky State University
>> >129 Atwood Research Facility
>> >Frankfort, KY 40601
>> >
>> >Phone: 502-227-5942
>> >Fax:     502-227-6381
>> >Email: kpomper@dcr.net                  Check out our web site at:
>> >or kpomper@gwmail.kysu.edu            http://www.pawpaw.kysu.edu
>> >
>> >
>> >
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>> >
>>
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>
>--
>Kirk W. Pomper, Ph.D.
>Principal Investigator of Horticulture
>Kentucky State University
>129 Atwood Research Facility
>Frankfort, KY 40601
>
>Phone: 502-227-5942
>Fax:     502-227-6381
>Email: kpomper@dcr.net                  Check out our web site at:
>or kpomper@gwmail.kysu.edu             http://www.pawpaw.kysu.edu
>
>
>
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