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False erosion of horizontal resistance to phylloxera in California vineyards. Considerations and outlook

L. Chiarappa and I.W. Buddenhagen
Phytopathologia Mediterranea
Vol. 33, No. 1 (April 1994), pp. 1-9
Stable URL: http://www.jstor.org/stable/42685912
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
False erosion of horizontal resistance to phylloxera in California vineyards. Considerations and outlook
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Abstract

Major developments in breeding for durable genetic resistance to crop parasites are examined in relation to the devastating experiences with phylloxera in Europe and California. From these studies, which include an analysis of the ongoing phylloxera epidemic in Napa and Sonoma valleys, it is concluded that the resistance of 'Rupestris St. George' is still effective against all forms of the parasite, while that of the hybrid 'AxR#1' is no longer functioning. This strongly suggests that phylloxera resistance is horizontal in 'Rupestris St. George' (and other American rootstocks) and that this is operating at close to a maximum level. This is not the case for the susceptible 'AxR#1' rootstock. Some of the reasons and evidence for this conclusion are presented. The need for comprehensive horizontal resistance in grape rootstocks to all major soil parasites is emphasized.

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