USPP6627P - Avocado tree called Barr Duke - Google Patents

Avocado tree called Barr Duke Download PDF

Info

Publication number
USPP6627P
USPP6627P US07/099,439 US9943987V US6627P US PP6627 P USPP6627 P US PP6627P US 9943987 V US9943987 V US 9943987V US 6627 P US6627 P US 6627P
Authority
US
United States
Prior art keywords
duke
barr
variety
rootstock
avocado tree
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/099,439
Inventor
Michael D. Coffey
Fred B. Guillemet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of California
Original Assignee
University of California
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of California filed Critical University of California
Priority to US07/099,439 priority Critical patent/USPP6627P/en
Assigned to REGENTS OF THE UNIVERSITY OF CALIFORNIA, UNIVERSITY HALL 2199 ADDISON STREE, UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720, A CORP. OF CA reassignment REGENTS OF THE UNIVERSITY OF CALIFORNIA, UNIVERSITY HALL 2199 ADDISON STREE, UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720, A CORP. OF CA ASSIGN THE ENTIRE INTEREST SUBJECT TO CONDITIONS IN AGREEMENTS RECITED Assignors: COFFEY, MICHAEL D., GUILLEMET, FRED B.
Application granted granted Critical
Publication of USPP6627P publication Critical patent/USPP6627P/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H6/00—Angiosperms, i.e. flowering plants, characterised by their botanic taxonomy
    • A01H6/52—Lauraceae, e.g. avocado
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H5/00—Angiosperms, i.e. flowering plants, characterised by their plant parts; Angiosperms characterised otherwise than by their botanic taxonomy
    • A01H5/08—Fruits

Definitions

  • This invention relates to a new and distinct rootstock variety of avocado tree (Persea americana var. drymifolia) designated ⁇ Barr Duke ⁇ .
  • ⁇ Barr Duke ⁇ is a Mexican avocado rootstock. It is a seedling of ⁇ Duke 6 ⁇ and has been tested at the University of California, Riverside and at South Coast Field Station, Irvine, Calif. for resistance to Phytophthora root rot caused by Phytophthora cinnamomi. It has also been tested for root rot resistance in various avocado grooves in southern California.
  • ⁇ Barr Duke ⁇ was initially tested in a nutrient solution tank which survived the severe root rot test and was then transplanted to infested soil in the greenhouse. The selection showed promise as a rootstock for root rot resistance and additional materials of the selection were propagated asexually for further greenhouse tests and for resistance tests in field plots. Over a period of seven years ⁇ Barr Duke ⁇ has demonstrated excellent growth in diseased sites. Further asexual reproduction of ⁇ Barr Duke ⁇ demonstrates that the variety remains consistent in the characteristics that distinguish it.
  • FIG. 1 shows the general shape and color of the ⁇ Barr Duke ⁇ selection.
  • FIG. 2 shows the foliage and flowers in more detail.
  • FIG. 3 shows the mature green fruit of the ⁇ Barr Duke ⁇ variety.
  • ⁇ Barr Duke ⁇ has three primary characteristics that distinguish it. It has high field resistance to Phytophthora root rot. It is a Mexican variety and is well-adapted to California conditions. When used as a rootstock, under some growing conditions, it reduces the size of the Hass scion variety.
  • ⁇ Barr Duke ⁇ Resistance to Phytophthora cinnamomi has been tested in many experiments with ⁇ Barr Duke ⁇ in the field. ⁇ Barr Duke ⁇ has consistently proved to be resistant, at a level comparable to the ⁇ Duke7 ⁇ rootstock. In an extremely severe test where the trees were deliberately inoculated with Phytophthora at planting time, ⁇ Barr Duke ⁇ was evaluated as producing growth comparable to that with ⁇ Barr Duke ⁇ not inoculated with Phytophthora.
  • the following chart represents visual ratings of the ⁇ Barr Duke ⁇ variety compared with other root rot resistant varieties according to observations made at the South Coast Field Station on Aug. 14, 1986.

Abstract

A new and distinct rootstock variety of avocado tree characterized by its high yield resistance to Phytophthora root rot caused by Phytophthora cinnamomi. This variety has a high level of resistance comparable to the `Duke 7` rootstock variety. It is also characterized under some field conditions by producing a somewhat smaller tree, when grafted with a `Haas` scion, than that typical of a `Duke 7` rootstock.

Description

DESCRIPTION
This invention relates to a new and distinct rootstock variety of avocado tree (Persea americana var. drymifolia) designated `Barr Duke`.
`Barr Duke` is a Mexican avocado rootstock. It is a seedling of `Duke 6` and has been tested at the University of California, Riverside and at South Coast Field Station, Irvine, Calif. for resistance to Phytophthora root rot caused by Phytophthora cinnamomi. It has also been tested for root rot resistance in various avocado grooves in southern California. `Barr Duke` was initially tested in a nutrient solution tank which survived the severe root rot test and was then transplanted to infested soil in the greenhouse. The selection showed promise as a rootstock for root rot resistance and additional materials of the selection were propagated asexually for further greenhouse tests and for resistance tests in field plots. Over a period of seven years `Barr Duke` has demonstrated excellent growth in diseased sites. Further asexual reproduction of `Barr Duke` demonstrates that the variety remains consistent in the characteristics that distinguish it.
In the drawing:
FIG. 1 shows the general shape and color of the `Barr Duke` selection.
FIG. 2 shows the foliage and flowers in more detail.
FIG. 3 shows the mature green fruit of the `Barr Duke` variety.
`Barr Duke` has three primary characteristics that distinguish it. It has high field resistance to Phytophthora root rot. It is a Mexican variety and is well-adapted to California conditions. When used as a rootstock, under some growing conditions, it reduces the size of the Hass scion variety.
Resistance to Phytophthora cinnamomi has been tested in many experiments with `Barr Duke` in the field. `Barr Duke` has consistently proved to be resistant, at a level comparable to the `Duke7` rootstock. In an extremely severe test where the trees were deliberately inoculated with Phytophthora at planting time, `Barr Duke` was evaluated as producing growth comparable to that with `Barr Duke` not inoculated with Phytophthora.
It is a less vigorous grower than `Duke 7`, `G755C` or `Thomas`, with or without Phytophthora root rot being present.
TREES AND FOLIAGE
`Barr Duke`, as is the case with the majority of avocado varieties, does not have distinctive foliage. The leaves have a distinct anise scent when crushed, which typifies the Mexican horticultural race.
FRUIT
Ovate; about 150 grams; smooth skin. Flesh about like `Zutano`. With reference to the Munsell Color Charts typically `Barr Duke` has a skin color (strong yellow green, Munsell Hue 2.5 GY 6/8) similar to the variety `Duke`. The season is about August through September in Southern California.
The following chart represents visual ratings of the `Barr Duke` variety compared with other root rot resistant varieties according to observations made at the South Coast Field Station on Aug. 14, 1986.
______________________________________                                    
           #        #                                                     
           PLANT-   SYMP-    %        AVE.                                
SELECTION  ED       TOMS     HEALTHY  STAGE                               
______________________________________                                    
BARR DUKE  10       1        90       0.2                                 
G755A      10       1        90       0.4                                 
THOMAS     10       1        90       0.6                                 
G755C      10       3        70       1.4                                 
G6 PARENT  10       4        60       1.4                                 
TORO CANYON                                                               
           10       5        50       2.4                                 
D9         10       5        50       2.8                                 
DUKE 7     10       6        40       2.2                                 
G755B      10       6        40       2.4                                 
G1033      10       8        20       4.3                                 
TOPA-TOPA  10       8        20       6.1                                 
BORCHARD   10       9        10       7.4                                 
______________________________________

Claims (1)

We claim:
1. The new and distinct rootstock variety of avocado tree herein described and illustrated and identified by the characteristics enumerated above.
US07/099,439 1987-09-21 1987-09-21 Avocado tree called Barr Duke Expired - Lifetime USPP6627P (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US07/099,439 USPP6627P (en) 1987-09-21 1987-09-21 Avocado tree called Barr Duke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/099,439 USPP6627P (en) 1987-09-21 1987-09-21 Avocado tree called Barr Duke

Publications (1)

Publication Number Publication Date
USPP6627P true USPP6627P (en) 1989-02-21

Family

ID=22275017

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/099,439 Expired - Lifetime USPP6627P (en) 1987-09-21 1987-09-21 Avocado tree called Barr Duke

Country Status (1)

Country Link
US (1) USPP6627P (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004014298A2 (en) * 2002-07-31 2004-02-19 Access Business Group International Llc Composition and method for lowering cholesterol

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004014298A2 (en) * 2002-07-31 2004-02-19 Access Business Group International Llc Composition and method for lowering cholesterol
WO2004014298A3 (en) * 2002-07-31 2004-07-01 Access Business Group Int Llc Composition and method for lowering cholesterol
US6793946B2 (en) * 2002-07-31 2004-09-21 Access Business Group International Llc. Composition and method for lowering cholesterol

Similar Documents

Publication Publication Date Title
Everett The New York botanical garden illustrated encyclopedia of horticulture
Weaver Grape growing
Lohrey et al. Pinus elliottii Engelm
Crane et al. The Mango1
CN110892843A (en) Method for cultivating pepper
Moscoso West indian cherry—richest known source of natural vitamin C
Darrow Blueberry growing
USPP6627P (en) Avocado tree called Barr Duke
Kane et al. The potential of Bombacopsis quinata as a commercial plantation species
Graney Carya ovata (Mill) K. Koch Shagbark hickory
Krezdorn et al. Fig growing in the south
Condit History of the avocado and its varieties in California with a check list of all named varieties
Gao et al. Growing tomatoes in the home garden
Meerow et al. Breeding of new Hippeastrum cultivars using diploid species
Stover The Lake Emerald grape
Condit The loquat
Nandwani et al. Grafting and improvement of breadfruit production in Micronesia
Chia et al. Mango
Fisch Passionfruit the world over
Campus Performance of mayhaws in south Georgia and north Florida
Traub Avocado production in the United States
Meghwal Production Technology of Less Known Fruit Crops of Arid Region
Almeyda et al. Cultivation of Neglected Tropical Fruits with Promise: The Rambutan
Dearing Muscadine grapes
Ferguson Observations on the Compatibility, Growth, and Cropping of Calamondin,'Meiwa'and'Nagami'Kumquat on Several Rootstocks

Legal Events

Date Code Title Description
AS Assignment

Owner name: REGENTS OF THE UNIVERSITY OF CALIFORNIA, UNIVERSIT

Free format text: ASSIGN THE ENTIRE INTEREST SUBJECT TO CONDITIONS IN AGREEMENTS RECITED;ASSIGNORS:COFFEY, MICHAEL D.;GUILLEMET, FRED B.;REEL/FRAME:004807/0773

Effective date: 19870903