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84 WINES&VINES May 2016 GRAPEGROWING WINE EAST EASTERN WINE LABS Serving the Analytical needs of East Coast Wineries WWW.EASTERNWINELABS.COM Ph 609-859-4302 Cell 609-668-2854 chemist@easternwinelabs.com AOAC Member EasternWineLab_Mar09.qxp 1/22/09 9:47 AM Page 1 - B E C O PA D - Y E A S T & E N Z Y M E S - C R U S H PA D E Q U I P M E N T - S T E R I L E F I LT R AT I O N - W I N E R Y H O S E - O A K A LT E R N AT I V E S EFFECT OF VINEYARD MANAGEMENT ON INCIDENCE AND SEVERITY OF BOTRYTIS BUNCH ROT Treatments 2007 2008 2009 2010 2011 2012 a Fungicides b Amendment and timing c Percent clusters infected with Botrytis P, V LR (hand)………….TB 7.0 a 29.0 a 23.0 ab 48 a 40.5 a 45.5 a P, V LR (hand)………….PS 11.5 ab 37.5 ab 35.5 bc 52 ab 54.0 ab 52.5 ab P, V e LR (hand)………….V 14.0 ab 38.5 ab 51.5 d P, V e 5 mg/L GA………….B 14.5 ab 37.0 ab 45.0 cd P, V f 10,25 mg/L GA……..B 15.5 ab 39.5 ab 44.0 cd 31 a 65.5 bc 64 bcd P, V * 20.8 b 47.0 b 42.0 cd 57.5 ab 72.5 cd 67.5 cd B, P, V, H * 15.5 ab 31.0 a 18.0 a 46.5 a 61.5 bc 60 abc Unsprayed * 37.3 c 73.3 c 71.5 e 66.5 b 84.0 d 85.5 e P = 0.0006 P = 0.0001 P = 0.0001 P = 0.003 P = 0.0003 P = 0.0003 Fungicides Amendment and timing cd Severity of Botrytis per cluster P, V LR (hand)………….TB 0.22 a 1.45 a 1.03 a 2.52 ab 2.71 a 3.30 a P, V LR (hand)………….PS 0.31 a 2.75 ab 2.10 abc 2.68 ab 6.99 ab 5.63 ab P, V e LR (hand)………….V 0.75 a 3.54 ab 4.34 cd P, V e 5 mg/L GA………….B 0.57 a 2.42 a 3.75 cd P, V f 10,25 mg/L GA……..B 0.57 a 3.39 ab 2.61 abc 1.72 a 7.34 ab 9.02 abc P, V * 1.23 a 5.28 b 3.54 bcd 3.97 b 14.00 b 10.74 bcd B, P, V, H * 1.21 a 3.77 ab 1.16 ab 2.51 ab 11.77 b 12.82 cd Unsprayed * 3.40 b 14.70 c 8.84 e 6.51 c 25.07 c 20.76 e P = 0.0003 P = 0.0001 P = 0.0001 P = 0.0002 P = .0003 P = 0.0007 The timing and method of leaf removal (LR), gibberellin (GA) and fungicides were studied on Chardonnay grape clusters at the Lake Erie Regional Grape Research and Extension Center. a Fungicides: Botrytis specific fungicides applied at B (50% to 80% bloom), P (prior to cluster closure), V (véraison), and H (pre harvest). b Amendment and timing: LR=leaf removal by hand applied at TB (trace bloom), PS (just after fruit set [post set]), or V (véraison). GA = gibberellin at 5, 10, or 25 mg/L applied at B (50% to 80% bloom). c Means with the same letter are not significantly different according to Fisher's Protected LSD (P < 0.05). d Severity was rated using the Barratt-Horsfall scale and was converted to % area infected using Elanco conversion tables. e After 2009, these treatments were dropped from the trial. f 10 mg/L GA was applied from 2007 to 2009, and 25 mg/L was applied from 2010 to 2012.