Application of abscisic acid increases curing of Pierce's disease-affected potted grapevines

Xylella fastidiosa is a xylem-limited, gram-negative bacterium that causes Pierce's Disease (PD) in grapevines. One year-old Vitis vinifera 'Pinot Noir' and 'Cabernet Sauvignon' grapevines growing in one gallon containers were mechanically inoculated with Xylella fastidiosa...

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Bibliographic Details
Published in:Phytopathology 2009-06, Vol.99 (6), p.S85-S85
Main Authors: Meyer, M, Kirkpatrick, B C
Format: Article
Language:English
Subjects:
Vitaceae
Vitis vinifera
Xylella fastidiosa
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Summary:Xylella fastidiosa is a xylem-limited, gram-negative bacterium that causes Pierce's Disease (PD) in grapevines. One year-old Vitis vinifera 'Pinot Noir' and 'Cabernet Sauvignon' grapevines growing in one gallon containers were mechanically inoculated with Xylella fastidiosa 'Stag's Leap' in the spring. In August, vines were confirmed to be infected with X. fastidiosa by PCR. In November, as the vines were going dormant, X. fastidiosa-infected vines were soil-drenched or sprayed with solutions of a naturally occurring or a synthetic abscisic acid (ABA). Vines were rated for symptoms of PD and tested for X. fastidiosa the following summer. ABA-treated vines had higher curing rates than untreated controls and some of the ABA-treated 'Pinot Noir' grapevines treatments had curing rates between 94-100%. The most effective curing treatment was the synthetic ABA applied as a drench. If X. fastidiosa-infected field-grown vines respond to ABA application as well as potted vines, growers may have a new tool to manage Pierce's disease.
ISSN:0031-949X