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October 2015 P R A C T I C A L W I N E R Y & V I N E YA R D 69 S M A R T V I T I C U L T U R E for growers and their advisers is to try and develop guidelines for their local region. That said, resistance to one trunk dis- ease does not confer resistance to another. Because the trunk diseases occur in mixed infection in a vineyard, growers should assume that multiple diseases will be pres- ent. 3. Combining risk and infection to decide an appropriate management strategy. Table 1 has three classes of risk and three classes of infection, and a suite of four suggested management strategies for each cell in the table. The infection values in the Table 1 heading are indica- tive only, and may vary from region to region and vineyard to vineyard in application. Strategy 1: Pre-harvest inspection is generally not necessary, as some symp- tomatic and dead vines are evident at winter pruning. Remove dead vines and burn. Encourage and retain suckers on symptomatic vines, and commence trunk renewal. Strategy 2: Perform pre-harvest inspec- tion to identify early stage symptomatic vines. Begin trunk renewal for any symp- tomatic vines and adjacent vines if clump- ing and staining are evident. 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 zinfandel.org • 530-274-4900 Zinfandel Advocates & Producers is a 501(c)(3) non-profit organization. ZAP is dedicated to advancing public knowledge of and appreciation for American Zinfandel and its unique place in our culture and history. You know how good your Zinfandel is... SUBSCRIBE ONLINE & SAVE! winesandvines.com/subscribe Print + Digital Magazine 12 monthly issues a year for $28 winesandvines.com/subscribe Esca progression in three different age trunks from one original vine root system. LUCIE MORTON