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Pawpaw Update: June 21, 2007

Kirk W. Pomper, Ph.D.

Principal Investigator of Horticulture/ Kentucky State University Adjunct Assistant Professor of Horticulture/ Univ. of Kentucky

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Introduction:

What is Pawpaw?

Asimina triloba (L.) Dunal.

Native tree fruit in the southeastern U.S.

Fruit can weigh up to 2 lbs.

Organic production possible

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The Pawpaw Fruit

Tropical-like flavor and aroma resembles mixture of banana, mango, and pineapple.

Custard-like fruits are berries

The fruit is very nutritious and high in antioxidant activity.

Could be used in blended fruit drinks, ice creams, yogurt, etc.

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Flowering Time and Harvest

The North American Pawpaw, Asimina triloba:

Cross-pollinate

Pollinated by flies and beetles Ripe fruit should yield when squeezed and give way with a gentle tug Color change not a reliable indicator of ripeness Fruit may be harvested from the same tree over several weeks

Ripe fruit should yield when squeezed and give way with a gentle tug

Color change not a reliable indicator of ripeness

Fruit may be harvested from the same tree over several weeks

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Pawpaws in the Wild

triloba is usually found in the forest understory in hardwood forests

Clonal reproduction by root suckering

You may not find many fruit (shade, self-incompatibility, lack of pollinators)

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History of the Pawpaw

Lewis and Clark recorded in their journal (18 Sept. 1806) how pawpaws helped save them from starvation.

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Hatfield family photo courtesy of McDowell County Historical Society

Pawpaw Tree Incident (Marker Number: 2047)

County: Pike Location: Near Buskirk, KY 1056

Description: This episode is result of August 1882 election-day fight. Tolbert, a son of Randolph McCoy, exchanged heated words with Ellison Hatfield, which started a fight. Tolbert, Pharmer and Randolph McCoy Jr. stabbed Ellison to death. Later the three brothers were captured by Hatfield clan, tied to pawpaw trees, and shot in retaliation. Presented by Pikeville-Pike County Tourism.

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Where Are We in Terms of Developing a Pawpaw Industry?

Orchard (cultivars) vs. wild collected fruit

Private orchards established AL, CA, KY, NC, MD, MI, MO, OH, and WV.

Ohio Pawpaw Growers Association

Ohio Pawpaw Festival

LAKE SNOWDEN ALBANY OHIO

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Freeze Damage!

April 7-9, 2007 freeze destroyed most of the pawpaw crop.

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Research Update

Ornamental Pawpaws

DNA fingerprinting

Regional Variety Trial Summary

Acetogenin Update

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KSU Ornamental Pawpaw Project

Started in 1995 with about 200 plants from Mr. Neal Peterson that were the result of a cross between Asimina triloba (female) x Asimina reticulata (pollen).

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The genus Asimina

Other members of the Asimina genus that are native to the extreme southeastern states:

incarna (Bartr.) Exell. (flag pawpaw)

longifolia Kral, A. obovata (Willd.) Nash

obovata Kral

pygmaea (Bartr.) Dunal

reticulata Shuttlw. ex Chapman

tetramera Small (opossum pawpaw)

parviflora (Michx.) Dunal (dwarf pawpaw)

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KSU Ornamental Pawpaw Project

Started in 1995 with about 200 plants from Mr. Neal Peterson that were the result of a cross between Asimina triloba (female) x Asimina reticulata (pollen).

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Red F1

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KSUOR001P

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KSUOR002Y

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KSUOR003Y

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KSUOR004R

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KSU Ornamental Pawpaw Project

Propagation a challenge

We will try a number of clonal propagation approaches

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Research Update

Ornamental Pawpaws

DNA fingerprinting

Regional Variety Trial Summary

Acetogenin Update

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DNA Fingerprinting

Dr. Li Lu, Co-Investigator of Biotechnology

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Research Update

Ornamental Pawpaws

DNA fingerprinting

Regional Variety Trial Summary

Acetogenin Update

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Establishing A Pawpaw Orchard

“Pawpaw Planting Guide”

Site

air drainage (frost)

deep, fertile, well-drained soil, pH 5.5-7.0

water source for irrigation

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What is a Cultivar?

■ Cultivar = refers to a named group of plants within a cultivated species that is distinguishable by a character or group of characters and that maintains its identity when propagated either asexually (e.g. ‘Jonathan’ apple) or sexually (e.g. ‘Tendercrop’ snapbean)

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Seedlings and Cultivars

Seedlings produce fruit in 5-8 years

Grafted cultivars can produce fruit in 3 years; know fruit quality

Takes about 5-6 years to reach full production

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Pawpaw Propagation and Nursery Sources

Historically, pawpaws have been a difficult tree species to propagate

Seed requires stratification and is desiccation sensitive

Commercial clonal propagation of cultivars is via chip budding onto seedling rootstock

Many nurseries grow pawpaw seedlings in containers

High prices for seedling and grafted trees are limiting the development of an industry

Seedlings $5.00-$10.00

Grafted trees $15.00-$25.00

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What cultivars should I plant?

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Materials and methods

28 selections, 10 named varieties, 224 total grafted trees on PPF seedling rootstock (half-sib seed)

■ Established in March 1998 at the KSU Research and Demonstration Farm in Frankfort, Kentucky in a Lowell silt loam soil (pH 6.9)

Spacing 2 m (6.5 ft) between trees, 5.5 m (18 ft) between rows

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Commercially Available Cultivars

Clone	Genetic background
‘Middletown’	Wild seedling from Middletown, Ohio
‘Mitchell’	Wild seedling from Iuka, Ill.
‘NC-1’	‘Davis’ female × ‘Overleese’ male
‘Overleese’	Cultivated (open-pollinated) seedling from Rushville, Ind.
‘PA-Golden’	Second-generation seedling from G.A. Zimmerman collection
‘Sunflower’	Wild seedling from Chanute, Kansas.
‘Taylor’	Wild seedling from Eaton Rapids, Mich.
‘Taytwo’	Wild seedling from Eaton Rapids, Mich.
‘Wells’	Cultivated (open-pollinated) seedlings from Salem, Ind.
‘Wilson’	Wild seedling from Cumberland, Ky.

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Seedlings of Commercially Available Cultivars

Clone	Genetic background
1-7-1 Shenandoah	Open-pollinated seedling of ‘Overleese’
1-23	Open-pollinated seedling of ‘Taylor’
1-68	Open-pollinated seedling from ‘Overleese’
8-20	Open-pollinated seedlings of ‘Sunflower’

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Seedlings from Collections

Clone	Open-pollinated seedling of
1-7-2	BEF-30
2-10	BEF-30
2-54	GAZ-VA
3-11	BEF-33
3-21	BEF-43
4-2	BEF-53
5-5	BEF-54
7-90	RS-2
8-58 Rappahannock	BEF-30
9-47	BEF-49
9-58	BEF-50
10-35	BEF-49
11-5 Susquehanna	BEF-53
11-13	BEF-53

BEF = Blandy Experimental Farm Collection, Boyce Va.

GAZ = George A. Zimmerman Collection., Linglestown, Pa.

RS = Ray Schlaanstine Collection, West Chester, Pa.

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Fruit Production on Mature Trees 2002-2006

Variety	Fruit weight (g)	Number of fruit per tree
Potomac	240 a	35 fg
Susquehanna	195 b	30 g
5-5	192 bc	30 g
Wabash	188 bc	52 ef
NC-1	177 bcd	35 fg
Overleese	171 cd	44 efg
1-68	167 d	72 bcd
8-20	164 de	50 efg
2-10	162 def	43 efg
Shenandoah	160 def	63 cde
Sunflower	159 def	62 cde
9-58	146 efg	62 cde
10-35	145 fg	86 ab
3-11	137 gh	55 def

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Variety	Fruit weight (g)	Number of fruit per tree
7-90	136 gh	58 cde
11-13	129 ghi	61 cde
1-23	129 ghi	74 bcd
Taytwo	121 hij	58 cde
2-54	120 hij	57 de
3-21	119 hij	45 efg
Mitchell	115 ij	44 efg
PA-Golden	112 ijk	100 a
Wells	106 jkl	54 def
Taylor	106 jkl	56 de
Rappahannock	93 klm
Wilson	86 lm
Middletown	81 m