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GLENN MCGOURT Y Grounded Grapegrowing The Top Five Threats To Vineyard Health experience with this topic, since some vine- yards have occupied the same space since the age of the Roman Empire and before. There are strategies that can be used to less- en potential problems. In this column I will A s California's vineyard industry grows and matures, we will be- gin to see what happens when you grow the same crop in the same place over time. Growers in Europe have considerable discuss what I consider to be the most wor- risome vine health issues and what you can do to avoid, address or control the maladies that can visit and blight your plantings. Mori_Nov05.qxt 9/19/05 3:29 PM Page 1 1. Nematodes Nematodes comprise such a broad group of organisms that this is potentially the most perplexing issue for viticulturists. As with having fungi in your vineyard, some are innocuous, some are pathogenic and some You know how good your SUPPLIERS OF QUALITY VIRUS CERTIFIED GRAFTED GRAPEVINES Deadline for Custom Grafted Order For Spring Planting is January of Previous Year For Further Information & Pricing Please Call or Write 1912 Concession 4 R.R. #2 Niagara-on-the-Lake Ontario, Canada LOS 1J0 Phone: 905-468-0822 Fax: 905-468-0344 zinfandel.org • 530-274-4900 Zinfandel Advocates & Producers is a 501(c)(3) non-profit organization. ZAP is dedicated to advancing public Zinfandel is... Promote your wines to leading Zinfandel enthusiasts and extend your winery's relationship in the market. Join Us! We are champions of Zinfandel— America's Heritage Wine Become part of our proud legacy WIRELINK® Tool-free Trellis & Fence Wire Splicer Broken or sheared ends of a wire are slipped into either end of the WireLink to make a secure splice. Requires no tools. Both WireVise and WireLink are available for wire from 9-13 gauge. For your nearest dealer, contact: WIREVISE® Trellis & Fence Wire Anchor Embossed jaws grip the wire as it is inserted and prevent it from being pulled out. The wire is retensionable with a pair of pliers or a claw hammer. Highlights • Older vineyards need special attention to avoid problems. • nematodes are unseen root pests that are difficult to prevent with a single resistant rootstock. • wood-rotting organisms infect vines in the winter, and lime sulfur sprays are an important control technique. • Phylloxera and Pierce's disease are long-term problems best controlled with resistant plant materials. Agfast_WireVise_Jan08 12/13/07 12:34 knowledge of and appreciation for American Zinfandel and its unique place in our culture and history. Toll-Free: 877.552-4828 909.451.2299 • Fax: 909.593-8309 Wines & Vines APRiL 2012 53