Details for: PI 638012, Pyrus pyrifolia (Burm. f.) Nakai, 'Choju'

Summary Data

Taxonomy:

Pyrus pyrifolia (Burm. f.) Nakai

Cultivar:

'Choju'

Origin:

Collected – Japan

Maintained:

National Clonal Germplasm Repository

Received by NPGS:

11 Mar 2003

Improvement Status:

Cultivar

Form Received:

Scion

Life Form:

Tree

Life Habit:

Tree

Availability

This accession is not available. Contact site for status.

National Clonal Germplasm Repository

Request are accepted Sept. 1st - Nov. 30th; Ships Jan.- Mar.

Images (3 total. Click on image for more.)

Core Passport Data

Taxonomy:

Pyrus pyrifolia (Burm. f.) Nakai

Cultivar:

'Choju'

Origin:

Collected – Japan

Maintained:

National Clonal Germplasm Repository

Received by NPGS:

11 Mar 2003

Improvement Status:

Cultivar

Form Received:

Scion

Life Form:

Tree

Life Habit:

Tree

Source History

Collected

Japan
Elevation: 0m.

Donated

11 March 2003.
Oregon, United States

Donor(s):

Postman, Joseph, USDA-ARS

Accession Names and Identifiers

'Choju'

Type: Cultivar name

Japanese Cultivar

'Chouju'

Type: Cultivar name

alternate spelling

Ichiban

Type: Other or unclassified name

Ichiban Nashi

Type: Trademark name

CPYR 2820

Type: Site identifier

Group: LOCAL

Corvallis local number

ASIAN CULTIVAR

Type: Site identifier

Group: CROPTYPE

Narrative

Choju. A very early season medium size Japanese pear. Origin: Kanagawa, Japan. A cross of Asahi x Kitsukawasei made at the Kanagawa Hort. Exp. Sta. in 1954; selected in 1969; named Choju (meaning 'long life') and released in 1973. The area around Ninomiya in Kanagawa Prefecture is a famous area for 'long life'. Fruit: v. early, med. size, russet skin; Flesh v. sweet, Tree: susc. to fireblight and pseudomonas. Resis. to black spot in Japan. One of the earliest ripening Asian pears available in the United States. Japanese people believe that eating early season ripening fruit promotes long life. Marketed as Ichiban Nashi (tm) by Fowler Nurseries. -- description from: I.Kajiura and Y.Sato. 1990. Recent progress in Japanese pear breeding and descriptions of cultivars based on literature review. Bulletin of the Fruit Tree Research Station (translated from Japanese by S. Wada).

Pyrus pyrifolia (Burm. f.) Nakai

Genus:

Pyrus

Section:

Pashia

Family:

Rosaceae

Subfamily:

Amygdaloideae

Tribe:

Maleae

Subtribe:

Malinae

Nomen number:

30569

Place of publication:

Bot. Mag. (Tokyo) 40:564. 1926

Verified:

07/13/2011 by ARS Systematic Botanists.

Other conspecific taxa

Pyrus pyrifolia (Burm. f.) Nakai var. culta (Makino) Nakai (0 active accession[s])
Pyrus pyrifolia (Burm. f.) Nakai var. pyrifolia (1 active accession[s])

Autonyms (not in current use), synonyms and invalid designations

Autonym(s)
Pyrus pyrifolia (Burm. f.) Nakai f. pyrifolia

Heterotypic Synonym(s)
Pyrus pyrifolia (Burm. f.) Nakai f. stapfiana (Rehder) Rehder
Pyrus serotina Rehder
Pyrus serotina Rehder var. serotina
Pyrus serotina Rehder var. stapfiana Rehder

Common names

Language	Name	Alternate name	note	seq	Citation
Swedish	sandpäron			2	Aldén, B., S. Ryman, & M. Hjertson. 2012. Svensk Kulturväxtdatabas, SKUD (Swedish Cultivated and Utility Plants Database; online resource)
Transcribed Korean	dolbaenamu			2	Mun-Chan, B. et al. 1986. A checklist of the Korean cultivated plants. Kulturpflanze 34:123.

Annotations

Observations

Phenotype Data

Category	Descriptor	Description	Value	Study	Inventory	Availability
CYTOLOGIC	PLOIDY LEVEL	Number of sets of chromosomes.	2x - diploid	PYRUS.PLOIDY.2008	CPYR 2820 .001 PL	Not Available
DISEASE	FRUIT_SCAB	RATING OF DAMAGE CAUSED BY FRUIT SCAB	1 - NO DAMAGE	PYRUS.CORVALLIS.2005.FRUITSCAB	CPYR 2820 .001 PL	Not Available
GENSTOCK	PYRUS CORE SUBSET	A flag to indicate the accession is part of the core subset		PYRUS.CORE.2012		Not Available