Ohio Grape-Wine Electronic Newsletter

Transcription

1 UH Ohio Grape-Wine Electronic Newsletter Editors: Imed Dami, Associate Professor and State Viticulturist David Scurlock, Viticulture Outreach Specialist Department of Horticulture and Crop Science Ohio Agricultural Research and Development Center HUwww.oardc.ohio-state.edu/grapeweb/ 04 October 2013 (37) Content: To Pick or Not to Pick.That is the Question Know your OSU Grape and Wine Experts

2 To Pick, or not to Pick That is the Question? by Dave Scurlock, OSU/OARDC Viticulture Outreach Specialist To be, or not to be, that is the question: Whether 'tis Nobler in the mind to suffer The Slings and Arrows of outrageous Fortune, Or to take Arms against a Sea of troubles, And by opposing end them: to die, to sleep No more; and by a sleep, to say we end The Heart-ache, and the thousand Natural shocks That Flesh is heir to? 'Tis a consummation Devoutly to be wished. To die, to sleep, To sleep, perchance to Dream; Aye, there's the rub, For in that sleep of death, what dreams may come To pick or not to pick, that is the question? Whether tis noble(r) rot or sour rot? Some people just plain think differently. I am not an avid reader of William Shakespeare but I did see a similarity in what he was saying and decisions we as growers and winemakers go through every year. Should I let the grapes hang.what are the pros and cons of increased hang time? The sugars increase and the acids decrease as the berries reach maturity. There is a point where the acids can start to increase again if left to hang too long. As the ripening process continues the berries can shrivel and the water content decreases through dehydration increasing the acid content. Varieties such as Pinot noir are usually picked at this stage when the berries start to shrivel. Increased hang time can be variety dependent. Niagara, on the other hand, is a grape that needs to be picked at an earlier maturity around 12 0 brix. The Niagara grape will indeed go higher in sugar content or brix but the fusel or diesel aromatics is really pronounced when they reach brix and this is not a positive flavor you want you Niagara wine to have. Brianna and Edelweis, Minnesota Cold Hardy Varieties, are also in the same boat with Niagara for picking them earlier in their maturation process. Hang time can increase aromatics such as fruity, citrusy and pineapple characteristics in white grape varieties and black cherry, currant, plum and black raspberry to name a few in red grape varieties. Seed maturity and their tannin contributions along with skin tannins also add to the overall contribution of tannins to the wine and need to be considered. Seeds can add a green or bitter taste to the juice when they are not fully mature too. Winemakers will sometimes chew on the seeds and look at the brown development of the seed coat to make an assessment on berry maturity. Attention must be paid to ph development in the maturation process too. When ph is allowed to climb too high ( ) the resulting color and microbial stability of your wines will be compromised negatively. A higher ph can also be an indicator of rot in the vineyard. Rot is responsible for the production of acetic acid or vinegar. We will discuss rot next. Rot Development and Weather Forecast: If you start to have rot development in your vineyard you may or may not have problems. Whether tis NOBLE(R) rot or SOUR rot makes a big difference in your To Pick or Not to Pick decision making process. Both of these rots are weather dependent. If we have an ideal fall with warm days, cool nights, and low or no

3 precipitation, we are golden. If we have good weather for the development of noble rot or botrytis, we can experience some really rich flavors from the berries that are made into wine. The botrytis or noble rot causes the berry to dehydrate and concentrates the sugars and flavors. This concentration of sugars and flavors occurs much the same way it does in the grapes that are left hanging for ice wine production. If our weather turns cold and wet, our sugars cease to increase, acids remain high and the potential for bunch rot can get out of control in a hurry. This is also a recipe for severely reduced yields and grape and potentially wine quality. Varmint Predation: During the maturation of the grapes, an invisible Neon Candy Store is OPEN sign, goes up in the vineyard. Grape Growers do not discriminate against their uninvited clientele. They hate all varmints equally. Varmints can range from bears in Virginia Vineyards to deer, raccoons, possums, birds (robins, starlings, turkeys) and insects (spotted wing drosophila, brown marmorated stink bug, multi colored asian lady beetle, grape berry moth, bees, wasps and hornets). It is a wonder that there is anything left to harvest? If the feeding process is allowed to start, it is hard to stop. The decision is a culmination of experience of the vineyard manager and the winemaker working hand in hand and in most of our farms they are one in the same person looking at weighted averages of sugars, ph, TA, rot, weather, varmints, insects and labor. If you have access to a mechanical picking machine the decision To Pick or Not To Pick can be delayed to the last possible minute due to the efficiency of the machine. This time of the year goes by so quickly, but at the time it seems as though time stands still and there is no beginning or end. It is a wellorchestrated three ring circus and Chinese fire drill. The culmination of a season whose outcome will not be known until the time of bottling in the case of white wines and some lighter red wines and only after aging of other red wines. To sleep, perchance to Dream; Aye, there's the rub, For in that sleep of death, what dreams may come

4 Know Your OSU Grape & Wine Research & Outreach Specialist By Imed Dami, HCS OARDC Many of the OGEN subscribers are new producers and are not familiar with OSU Specialists who provide expertise and assistance in the field of grape growing and wine making. The information below may be redundant for some readers, but it is good to remind/inform our new producers of the resources available at OSU and will be included in all future issues of OGEN. Please contact the following Research, Extension/Outreach Specialists, and Educators if you have any questions relating to their respective field of expertise. Contact Information Name & Address Phone & Website Area of Expertise & Assistance Provided Dr. Mike Ellis, Professor Dept. Plant Pathology 224 Selby Hall OARDC E mail: ellis.7@osu.edu Website: dex Grape diseases and control. Recommendation on grape fungicides Dr. Roger Williams, Professor Dept. Entomolgy 202 Thorne Hall OARDC E mail: williams.14@osu.edu Website: Grape insects/mites and control. Recommendation on grape insecticides Dr. Doug Doohan, Professor Dept. Horticulture & Crop Science 205 Gourley Hall OARDC E mail: doohan.1@osu.edu Website: Vineyard weeds and control. Recommendation on herbicides Dr. Imed Dami, Associate Professor & Viticulture State Specialist Dept. Horticulture & Crop Science 216 Gourley Hall OARDC E mail: dami.1@osu.edu Website: oardc.osu.edu/grapeweb/ Viticulture research and statewide extension & outreach programs. Recommendation on variety selection. Imed is the primary research contact of the viticulture program.

5 Contact Information Name & Address Phone & Website Area of Expertise& Assistance Provided David Scurlock, Viticulture Outreach Specialist 118 Gourley Hall OARDC E mail: scurlock.2@osu.edu Website: oardc.osu.edu/grapeweb/ Evaluation of site suitability for vineyard establishment and all aspects of grape production practices in northern Ohio. David is the primary extension contact of the viticulture program Todd Steiner, Enology Program Manager & Outreach Specialist Dept. Horticulture & Crop Science 118 Gourley Hall OARDC E mail: steiner.4@osu.edu Website: oardc.osu.edu/grapeweb/ Commercial wine production, sensory evaluation, laboratory analysis/setup and winery establishment. Todd is the primary research and extension contact of the enology program Dr. Gary Gao, Small Fruit Specialist and Associate Professor, OSU South Centers 1864 Shyville Road, Piketon, OH OSU Campus in Columbus Room 256B, Howlett Hall, 2001 Fyffe Ct Columbus, OH ext.123 Fax: gao.2@cfaes.osu.edu Website: Viticulture Research and Outreach, VEAP visits in southern Ohio, vineyard management practices, soil fertility and plant nutrition, fruit quality improvement, variety evaluation, table and wine grape production Greg Johns, Station Manager Ashtabula Agricultural Research Station 2625 South Ridge Road Kingsville, OH E mail: johns.1@osu.edu Website: Winegrape production in Northeast Ohio, especially vinifera varieties

6 Contact Information Name & Address Phone & Website Area of Expertise& Assistance Provided David Marisson, County Extension Director, Assistant Professor & Extension Educator, OSU Extension Ashtabula County 39 Wall Street Jefferson, Ohio Ext. 106 E mail: marrison.2@osu.edu Website: ashtabula.osu.edu Vineyard and winery economics, estate planning and Extension programs in Northeast Ohio fox.264@osu.edu Wine and wine grape marketing Dr. Julie Fox, Direct Marketing Specialist 1864 Shyville Road Piketon, Ohio , ext. 225 Website: Ohio MarketMaker: