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Rooting cuttings under mist: Leafy softwood cuttings of paradox walnut hybrids rooted successfully in mist propagation tests during summer of 1956

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Authors

Curtis Lynn, University of California
H. T. Hartmann, University of California

Publication Information

California Agriculture 11(5):11-15.

Published May 01, 1957

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Abstract

The paradox walnut hybrid—Juglans hindsii x J. regia—is very much in demand by California walnut growers as a rootstock for English walnut varieties due to its vigor and its resistance to crown rot—Phytophthora cactorum—tolerance of excess water, and apparent potential resistance to root lesion nematodes—Pratylenchus vulnus. Such hybrid seedlings are ordinarily obtained from nuts taken from Northern California black walnut—J. hindsii—trees growing in the vicinity of English walnut—J. regia—trees. Since the individual seedlings vary considerably in their vigor and in their resistance to various diseases and nematodes, it would be very desirable to be able to propagate such rootstock trees vegetatively from outstanding selected hybrid parent trees. However, cuttings of these hybrids have been extremely difficult to root and at present vegetative propagation is limited almost entirely to trench layering.

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Author notes

California Agriculture, May 1956, page 7, published a description of mist equipment.

Rooting cuttings under mist: Leafy softwood cuttings of paradox walnut hybrids rooted successfully in mist propagation tests during summer of 1956

Curtis Lynn, H. T. Hartmann
Webmaster Email: wsuckow@ucanr.edu

Rooting cuttings under mist: Leafy softwood cuttings of paradox walnut hybrids rooted successfully in mist propagation tests during summer of 1956

Share using any of the popular social networks Share by sending an email Print article
Share using any of the popular social networks Share by sending an email Print article

Authors

Curtis Lynn, University of California
H. T. Hartmann, University of California

Publication Information

California Agriculture 11(5):11-15.

Published May 01, 1957

PDF  |  Citation  |  Permissions

Author Affiliations show

Abstract

The paradox walnut hybrid—Juglans hindsii x J. regia—is very much in demand by California walnut growers as a rootstock for English walnut varieties due to its vigor and its resistance to crown rot—Phytophthora cactorum—tolerance of excess water, and apparent potential resistance to root lesion nematodes—Pratylenchus vulnus. Such hybrid seedlings are ordinarily obtained from nuts taken from Northern California black walnut—J. hindsii—trees growing in the vicinity of English walnut—J. regia—trees. Since the individual seedlings vary considerably in their vigor and in their resistance to various diseases and nematodes, it would be very desirable to be able to propagate such rootstock trees vegetatively from outstanding selected hybrid parent trees. However, cuttings of these hybrids have been extremely difficult to root and at present vegetative propagation is limited almost entirely to trench layering.

Full text

Full text is available in PDF.

Author notes

California Agriculture, May 1956, page 7, published a description of mist equipment.


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