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Oblonga …a clonal olive rootstock resistant to verticillium wilt

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Authors

Hudson Hartmann, University of California, Davis.
W. C. Schnathorst, University of California, Davis.
John Whisler, University of California, Davis.

Publication Information

California Agriculture 25(6):12-15.

Published June 01, 1971

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Abstract

A field planting in Tulare county of Sevillano olives grafted on various rootstocks provided opportunity for observations on susceptibility to verticillium wilt. In this 16-year test period, trees growing on the Oblonga clonal rootstock remained free of symptoms while 20 to 100 percent of the trees grafted on other olive species and varieties were killed by verticillium. None of the trees with the highly susceptible Sevillano as the scion variety on the Oblonga root showed symptoms of verticillium wilt…suggesting that the pathogen is not transmitted through the graft. Several trials with two major strains of Verticillium albo-atrum taken from cotton and olives in Tulare county, using controlled inoculation techniques and greenhouse conditions at Davis, confirmed the resistance of Oblonga to verticillium wilt. Sevillano, Ascolano, and Mission develop to normal sized trees on Oblonga roots. However, in studies at Winters this rootstock exerted some dwarfing influence on Manzanillo. No evidence of graft incompatibility or a weak graft union has appeared in any of these combinations.

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Oblonga …a clonal olive rootstock resistant to verticillium wilt

Hudson Hartmann, W. C. Schnathorst, John Whisler
Webmaster Email: wsuckow@ucanr.edu

Oblonga …a clonal olive rootstock resistant to verticillium wilt

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

Hudson Hartmann, University of California, Davis.
W. C. Schnathorst, University of California, Davis.
John Whisler, University of California, Davis.

Publication Information

California Agriculture 25(6):12-15.

Published June 01, 1971

PDF  |  Citation  |  Permissions

Author Affiliations show

Abstract

A field planting in Tulare county of Sevillano olives grafted on various rootstocks provided opportunity for observations on susceptibility to verticillium wilt. In this 16-year test period, trees growing on the Oblonga clonal rootstock remained free of symptoms while 20 to 100 percent of the trees grafted on other olive species and varieties were killed by verticillium. None of the trees with the highly susceptible Sevillano as the scion variety on the Oblonga root showed symptoms of verticillium wilt…suggesting that the pathogen is not transmitted through the graft. Several trials with two major strains of Verticillium albo-atrum taken from cotton and olives in Tulare county, using controlled inoculation techniques and greenhouse conditions at Davis, confirmed the resistance of Oblonga to verticillium wilt. Sevillano, Ascolano, and Mission develop to normal sized trees on Oblonga roots. However, in studies at Winters this rootstock exerted some dwarfing influence on Manzanillo. No evidence of graft incompatibility or a weak graft union has appeared in any of these combinations.

Full text

Full text is available in PDF.

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