For downy mildew, some example systemics include Abound and Forum. For powdery mildew, choose from a variety of systemic products such as Torino, Rally, or Quintec. If visible infections are present, use a curative systemic fungicide with strong efficacy on the relevant disease. Watch for active infections of powdery mildew and downy mildew on grapevine leaves and fruit. Our growing season has been so dry, but it's time to remember the words of UMN graduate student Davy DeKrey, "When it rains it spores!"
See this fact sheet for more detailed Itasca recommendations. 8.7-10.8 g/L titratable acidity has been typical at the HRC, but levels as low as 6 g/L have also been observed.Here are some suggested targets for Itasca, based on UMN observations at the Horticultural Research Center in Excelsior: We look forward to tasting many high quality Itasca wines from 2021, which will help establish a great reputation of this new variety.
Itasca does well with a late harvest, so growers need not hurry to harvest Itasca if the metrics are not there yet especially since the vines have had relatively low disease pressure this year and we are still early in the harvest season. Be sure the pH is in the acceptable range rather than only harvesting based on brix. I suspect it is not yet ready at most sites, except in the case of sparkling wine usage. I saw a bit of Itasca being harvested at one vineyard. Not too much yet, however table grapes and some Swenson varieties are being harvested. Splitting on very ripe crabapples after a large rainfall event. Just keep an eye out for fruit splitting, which can sometimes happen to ripe fruit if it takes on a lot of water all at once after a dry spell. We all really needed that rain that much of Minnesota got (is getting) this week. Please see this article for more information: Grading and Sorting Apples for Direct-to-Customer Sales
All licensed growers of SweeTango in Minnesota should have access to the list of standards, or can contact Ferguson's Orchard for a copy. The SweeTango contract requires that certain quality and ripeness standards are followed in order for the fruit to be sold as SweeTango. The starch-iodine test combined with flavor testing may be used to schedule harvest dates for both varieties. I just sampled some delicious ripe Zestar! in Long Lake, so I imagine that some growers are already harvesting that and most will be very soon. Our team is harvesting SweeTango in Preston and White Bear Lake next Tuesday and Wednesday for our apple hail netting research project. SweeTango and Zestar! harvest are approaching in the next week. For the most part, MN55 (First Kiss) harvest is finishing up.
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