The MGWII has teamed up with Randall Vos (ISU Extension) to perform grape maturity analysis for multiple locations across Iowa and one site in Illinois.
Each week during the harvest season you’ll receive this email with a link to the data for multiple cultivars and the current week’s analysis of soluble solids (Brix), pH, TA and berry weights.
Please consider sampling your own vineyard as well to get an accurate picture of grape ripening. Please contact Randall (firstname.lastname@example.org) or the MGWII (email@example.com) if you have any questions, or need help to get a sampling program started.
2023 Midwest Wine Grape Berry Composition Report: Week 1
Welcome to the inaugural edition of the Midwest Wine Grape Berry Composition Report!
As with every project, this has been made possible by several entities. We would like to thank the growers for being willing to send in samples or allow us to sample in their vineyards, Iowa State University Extension and Outreach for their travel support, and the Midwest Grape and Wine Industry Institute for providing the supplies, shipping, and sample analyses.
We will be sampling over the next 7 weeks, or until harvest. Our goal in the future is to get this report out every Friday, so be looking for the next report later this week.
Given that this is our first report, it’s a bit premature to look at too many trends in ripening, but the pH of the Story County samples seem to be on track (to possibly a few days more advanced) with 2022.
As expected, Brianna and Edelweiss look to be the most advanced, followed by Itasca, and then the Frontenacs, La Crescent, Marechal Foch, and Marquette in the next tier.
One interesting thing to note is that so far Brianna, Edelweiss, and La Crescent have quite a bit of variability in berry weights. This could be due to differences in maturation or crop load, but it could also be a result of the variable precipitation we have had in the region this year.
We hope that this information will help assist growers and wineries in the region during the upcoming busy harvest season. Keep in mind that crop load and local climate conditions can impact your local grape maturity.
The format of this report will likely change in the future, as we collect more data, and get feedback from growers and wineries. So, please don’t hesitate to contact us with suggestions!