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January 2018 WINES&VINES 127 PRACTICAL WINERY & VINEYARD GRAPEGROWING 715 S. Guild Avenue • Lodi, CA 95240 • 209-370-1616 info@watermarklabels.com • www.watermarklabels.com Complimentary press proofs Unlimited Capabilities | Variable data | Custom die-cutting Visit us at Unified - Booth #1337 Significantly greater sour rot pressure was seen in 2015, with nearly 30% of berries diseased on vines receiving no insecticide or antimicrobial treatment, compared to 16% in 2013. In contrast to 2013, the insecticide alone provided significant control (57% re- duction relative to untreated vines) without addition of an antimicrobial treatment. Dis- ease control increased significantly (73% to 84% reduction) in those panels where both antimicrobial and insecticide treatments were applied weekly starting before the onset of symptoms. However, when the addition of antimicro- bial treatments was delayed until symptoms appeared, the combination treatments did not provide significantly more control than the insecticide alone. Furthermore, even when applied on a preventive basis before symptoms appeared, antimicrobial treat- ments applied alone were relatively ineffec- tive and never provided the same level of control as insecticide applied alone. Sour rot severity on untreated vines in 2016 was comparable to 2015. Significant control (40%) was provided when insecticide was ap- plied without the addition of an antimicrobial treatment. Further control was achieved when any of three antimicrobial treatments was combined with insecticide starting before the onset of symptoms, whereas delaying addition of an antimicrobial treatment until symptom onset increased control for only one of the two materials tested (see "Sour Rot Control, Field Trial," above). Three years of chemical control trials demonstrated the importance of insecticide sprays in controlling sour rot, and the ad- ditional control provided when antimicrobial sprays were combined with insecticide be- fore the onset of symptoms. In all three years, applying KMS weekly beginning at 15° Brix (pre-symptoms) in conjunction with an insecticide achieved an average 65% control compared to the unsprayed treatment, and in the two years when OxiDate 2.0 was in- cluded in conjunction with Mustang Maxx on this schedule, an average 69% control 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... Sour rot severity measured in a vineyard block of Vitis interspecific hybrid Vignoles in Geneva, N.Y., in 2016 as a function of antimicrobial and insecticide treatments. Asterisks (*) above mean bar values represent statisti- cally significant (P = 0.05) reductions relative to the treatment receiving no insecticide or antimicrobial sprays. SOUR ROT CONTROL FIELD TRIAL 35 30 25 20 15 10 5 0 Control KMS 1.0 Pre- Symptoms Oxidate 2.0 Pre- Symptoms Fracture Pre- Symptoms Oxidate 2.0 at Symptoms Fracture at Symptoms Oxidate following first rain Oxidate following in- crease in MDD Cluster area diseased (%) * * * * * * * n No Insecticide n Insecticide