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Avocado rootstock named `Zentmyer`

a technology of zentmyer and avocado, which is applied in the field of zentmyer rootstock, can solve the problems of severe damage and the variety does not yield well under non-root rot conditions, and achieves the effect of high tolerance against phytophthora root ro

Active Publication Date: 2014-02-25
RGT UNIV OF CALIFORNIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is severely damaged by salt and is not recommended for locations where salt is a problem.
This variety also does not yield well under non-root rot conditions in comparison to similar varieties.

Method used

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  • Avocado rootstock named `Zentmyer`
  • Avocado rootstock named `Zentmyer`
  • Avocado rootstock named `Zentmyer`

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020]The following is a detailed description of the new ‘Zentmyer’ variety, which was taken from an approximately nine-year-old mature tree, with the exception as a rootstock for a specific scion when reference is made to root rot resistance and salinity tolerance. The tree is located in an experimental orchard in Irvine, Calif. and is grafted on a Persea americana seedling used as a rootstock.

[0021]The Royal Horticultural Society (R.H.S.) Color Chart is used herein for the color description of the rind, seed, bark, leaf, flower, flesh color and other interest of the ‘Zentmyer’ avocado tree.

Trees, Foliage, and Flowers

[0022]Tree:[0023]Growth habit.—Vigorous, upright and spreading when compared to the rootstock ‘Thomas’.[0024]Vigor.—Below are data on the vigor of ‘Hass’ grafted onto the rootstock of ‘Zentmyer’, as determined by trunk diameter measurements from trees planted in an orchard with Phytophthora cinnamomi in Escondido Calif.

[0025]

TABLE 1Trunk diameter (cm)Rootstockyear 1yea...

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PUM

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Abstract

A new and distinct variety of Persea americana tree having a high tolerance under most conditions to Phytophthora cinnamomi when used as a rootstock. However, it is severely damaged by salt and is not recommended for locations where salt is a problem. This variety does not yield well under non-root rot conditions in comparison to similar varieties, making it desirable for replant situations where root rot infested soils are a problem.

Description

[0001]Latin name of the genus and species:[0002]The avocado cultivar of this invention is botanically identified as Persea americana Mill.[0003]Variety denomination:[0004]The variety denomination is ‘Zentmyer’.BACKGROUND OF THE INVENTION[0005]Avocado root rot is the limiting factor for the growth of avocados throughout the world. Avocado root rot is caused by the fungus Phytophthora cinnamomi, which attacks and kills the feeder roots of avocado trees. The resultant lack of roots causes the tree to eventually die from water stress. There are a number of varieties of rootstocks that have some tolerance to the disease. These varieties included ‘Duke 7’ (unpatented), the most commonly planted tolerant rootstock in the world; and ‘Thomas’ (U.S. Plant Pat. No. 6,628), another root rot tolerant rootstock. However, even with these rootstocks, growers must still use a variety of methods, including mounding, mulching and the applications of chemical fungicides, to keep the tress from dying in...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): A01H5/00A01H5/08
CPCA01H5/0818A01H5/08A01H6/52
Inventor MENGE, JOHN A.MARTIN, GRAY E.BERGH, BERTHOLD O.GUILLEMET, FRED B.MCKEE, BRANDON S.
Owner RGT UNIV OF CALIFORNIA
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