2018 Grape Maturity at OSU Research Vineyards

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1 OHIO AGRICULTURAL RESEARCH AND DEVELOPMENT CENTER OHIO STATE UNIVERSITY EXTENSION 2018 Grape Maturity at OSU Research Vineyards Imed Dami, Diane Kinney, Andy Kirk, Yvonne Woodworth, The Ohio State University. Thanks to the continuous interest by Ohio growers and vintners and support by the Ohio Grape Industries Committee, we are pleased to resume monitoring fruit maturity progression of varieties grown at the research vineyards during the 2018 season. This information will be sent weekly to OGEN subscribers and posted on the program website, Buckeye Appellation. The date of berry sampling and corresponding heat units or growing degree days (GDD) are included. Note that the GDD in your location could be higher or lower than that at our sites. For example, at the Wooster research vineyard, grape ripening of similar varieties is typically 1 to 2 weeks behind central and southern Ohio, and 1 to 2 weeks ahead of more northern latitude vineyards and on Lake Erie shores. To determine the GDD in your location, visit the OSU-GDD Calculator. To learn more about monitoring fruit maturity and berry sampling, please read OSU factsheet at the following link: Are your grapes ready to pick? Click here for Fruit maturity from previous years. We wish you bountiful and successful harvest!! Grape maturity of grape varieties at the Wooster research vineyard: (1) Sampling : 8/20/2018 (GDD=2242) 50 Berry Cabernet franc La Crescent Marquette Regent Sauvignon blanc *SS: soluble solids, which estimate sugar concentration in grape juice using a refractometer. ph: measures active acidity (strength of H+ ions) in grape juice using a ph meter. TA: titratable acidity, or total acidity, measures actual amount of organic acids in grape juice. FMI: fruit maturity index = SS/TA*10.

2 Grape maturity of grape varieties at the Wooster research vineyard: (2) Sampling : 8/27/2018 (GDD=2376) 50 Berry Cabernet franc Chardonnay La Crescent Marquette Regent Sauvignon blanc (3) Sampling : 9/4/2018 (GDD=2594) Cabernet franc Chardonnay La Crescent Marquette (4) Sampling : 9/10/2018 (GDD=2719) Cabernet franc Chardonnay La Crescent Marquette

3 Grape maturity of grape varieties at the Wooster research vineyard: (5) Sampling : 9/17/2018 (GDD=2856) Cabernet franc Chambourcin Chardonnay La Crescent Marquette (6) Sampling : 9/24/2018 (GDD=2985) Cabernet franc Chambourcin Chardonnay La Crescent* 20-Sep Marquette* 18-Sep *Fruit harvested earlier than desired, thus without optimal fruit composition numbers due to excessive rot.

4 Grape maturity of grape varieties at the Wooster research vineyard: (7) Sampling : 10/1/2018 (GDD=3031) Cabernet franc Chambourcin Chardonnay 1-Oct La Crescent* 20-Sep Marquette* 18-Sep *Fruit harvested earlier than desired, thus without optimal fruit composition numbers due to excessive rot. (8) Sampling : 10/8/2018 (GDD=3185) Cabernet franc Chambourcin Chardonnay 1-Oct La Crescent* 20-Sep Marquette* 18-Sep *Fruit harvested earlier than desired, thus without optimal fruit composition numbers due to excessive rot.

5 Grape maturity of grape varieties at the Wooster research vineyard: (9) Sampling : 10/19/2018 (GDD=3262) Cabernet franc 19-Oct Chambourcin 19-Oct Chardonnay 1-Oct La Crescent* 20-Sep Marquette* 18-Sep *Fruit harvested earlier than desired, thus without optimal fruit composition numbers due to excessive rot.

6 Grape maturity of grape varieties at the Kingsville research vineyard: (1) Sampling : 8/28/2017 (GDD=2273) Arandell Frontenac Gamay noir Pinot noir Regent Siegerrebe (2) Sampling : 9/5/18/2017 (GDD=2464) wt (g) Arandell Cabernet franc Chardonnay Frontenac Gamay noir Pinot noir Regent Sauvignon blanc Sauvignon gris Teroldego

7 Grape maturity of grape varieties at the Kingsville research vineyard: (3) Sampling : 9/12/18/2018 (GDD=2578) wt (g) Arandell Cabernet franc Chardonnay Frontenac Gamay noir Pinot noir Regent Sauvignon blanc Sauvignon gris (4) Sampling : 9/18/18/2018 (GDD=2708) wt (g) Arandell Cabernet franc Chardonnay Frontenac Gamay noir Pinot noir Regent Sauvignon blanc Sauvignon gris

8 Grape maturity of grape varieties at the Kingsville research vineyard: (5) Sampling : 9/25/18/2018 (GDD=2812) wt (g) Arandell Cabernet franc Chardonnay Frontenac Gamay noir Pinot noir 24-Sep Regent Sauvignon blanc Sauvignon gris 21-Sep (6) Sampling : 10/3/18/2018 (GDD=2901) wt (g) Cabernet franc Chardonnay Frontenac 1-Oct Gamay noir Pinot noir 24-Sep Regent Sauvignon blanc Sauvignon gris 23-Sep

9 Grape maturity of grape varieties at the Kingsville research vineyard: (7) Sampling : 10/10/18/2018 (GDD=3021) Cabernet franc Chardonnay Frontenac 1-Oct Gamay noir 9-Oct Pinot noir 24-Sep Regent Sauvignon blanc 9-Oct Sauvignon gris 23-Sep (8) Sampling : 10/17/18/2018 (GDD=3044) Cabernet franc Chardonnay 16-Oct Frontenac 1-Oct Gamay noir 9-Oct Pinot noir 24-Sep Regent 5-Oct Sauvignon blanc 9-Oct Sauvignon gris 23-Sep

10 Grape maturity of grape varieties at the Kingsville research vineyard: (9) Sampling : 10/25/18/2018 (GDD=3044) Cabernet franc 25-Oct Chardonnay 16-Oct Frontenac 1-Oct Gamay noir 9-Oct Pinot noir 24-Sep Regent 5-Oct Sauvignon blanc 9-Oct Sauvignon gris 23-Sep

2018 Grape Maturity at OSU Research Vineyards

2018 Grape Maturity at OSU Research Vineyards OHIO AGRICULTURAL RESEARCH AND DEVELOPMENT CENTER OHIO STATE UNIVERSITY EXTENSION 2018 Grape Maturity at OSU Research Vineyards Imed Dami, Diane Kinney, Andy Kirk, Yvonne Woodworth, The Ohio State University.

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