North American Fruit Explorers mailing list at ibiblio

["Kirk W. Pomper" <kpomper@dcr.net>]

>Subject: [nafex] Pawpaw
>Date: Sun, 25 Jun 2000 20:42:33 -0400
>From: "Hortus" <HORTUS@worldnet.att.net>
> Reply-To: nafex@egroups.com
>To:  "NAFEX List" <nafex@egroups.com>, "Rare fruit list"
<rarefruit@egroups.com>

>Has anyone specific info on the propagation of pawpaw
>(Astimina parviflora or Astimina triloba) from cuttings.
The CA Rare Fruit Growers fact sheet says: it has been done
>with softwood cutttings with mist and under soil heat; with
>hardwood it is not possible.  Hartmann (Pland Prop P&P)
>says: seed propagation only

>regards
>Joel
>

Joel:

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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