Copyrighted. Rights are owned by the American Society for Enology and Viticulture. The Sonoma County Library makes no assertions as to ownership of any original copyrights to digitized work and can claim only physical ownership of the work(s) described in these records. However, these materials are intended for Personal or Research use only. Any other kind of use, including, but not limited to commercial or scholarly publication in any medium or format, public exhibition, or use online or in a web site, may be subject to additional restrictions including but not limited to the copyrights held by parties other than the Library. USERS ARE SOLELY RESPONSIBLE for determining the existence of such rights and for obtaining any permissions and/or paying associated fees necessary for the proposed use. Preferred credit line is: Courtesy, the Sonoma County Library. Please see <a href='https://sonomalibrary.org/locations/sonoma-county-history-and-genealogy-library/order-photo' target='_blank' rel='noopener noreferrer'>additional reproduction and reuse information</a>
Description
One of the earliest indications ofbiotype B phylloxera infestations in the North Coast region of California is the development of potassium deficiency symptoms in leaf lamina. Recently, putrescine accumulation has been shown to occur before the onset of potassium deficiency symptoms in Cabernet Sauvignon vines. This study was, therefore, conducted to determine whether vine putrescine status could be used to monitor the spread of biotype B phylloxera within existing vineyards grafted to A5R#l rootstock. Vines from paired Cabernet Sauvignon, Chardonnay, and Sauvignon blanc vineyards in Napa and Sonoma Counties were selected for their proximity, phylloxera status, potassium status, and existing rootstock (A5R#l and ll0R). Leaves opposite basal clusters were taken from three 10-vine replicates starting before bloom and continuing until harvest. Lamina and petioles were separated, dried at 70°C and analyzed for potassium and putrescine using standard flame photometry and HPLC methods. Vines grafted to A5R#l from vineyards with biotype B phylloxera displayed potassium deficiency symptoms as early as bloom time. Vines grafted to A5R#l from potassium deficient vineyards displayed symptoms at or near veraison, whereas vines grafted to ll0R did not display symptoms during the season.
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.
