Ewing, B., et al., Management of Apple Maturity and Postharvest Storage Conditions to Increase Polyphenols.Rosend, J., et al., The effects of apple variety, ripening stage, and yeast strain on the volatile composition.Washington Tree Fruit Research Commission website]. Availableįrom: jsessionid=AA54A3E7FD1F8262EA372ECF34AF9A52?sequence=2 (Accessed Sept. 1992, Cornell Cooperative Extension Publication: Cornell University.
#APPLE COLOR IN IODINE TEST WINDOWS#
Silsby, Predicting harvest date windows for apples, Information Bulletin 221. We consider apple harvest at WARC complete. *10/09/19: There is snow on the ground and we've had four nights since 9/30 where 'Wealthy' (one 100-year old tree) - Harvested over weekend 10/05/19 'McIntosh' (combination 100-year old orchard + tree by the gate) - Most harvested 10/04/19 'Cortland' - Codling moth experiment harvested 10/02/19 Starch-Iodine Index of apples varieties at WARC, fall 2019.Īverages are of 10 fruit picked to represent both interior and exterior canopy fruitĪnd the planting as a whole, unless otherwise noted.ĭate of measurement of starch-iodine index See Apple Maturity and Harvest by Washington State University for further details. Brix (a measure of sugars), firmness, and other tools can also be used to assessįruit maturity and quality. Other tools for assessing fruit ripeness. Virginia Cooperative Extension also has recipes for making the solution detailed Our thyroid glands use it to make thyroid hormones (T3 molecular weight is 59 iodine T4 molecular weight, 65), and a severe deficiency can manifest in the development of goiter. Our bodies require it, for several reasons. Pre-mixed iodine solution can be purchased through Wilson Irrigation in Yakima, WA. Iodine is a highly water-soluble trace element that’s rare in the earth’s crust, but fairly prevalent in its seas. What would be considered overripe for dessert varieties. In Montana, hard cider varieties tend to be picked at more advanced maturity or Suggests cultivar has more impact than ripeness on volatile profiles (aroma) of resultingĬiders in one study, and phenolics were not greatly impacted by apple maturity (ripeness) in another
For dessert apple cultivars, picking fruit at optimal maturity for either freshĮating or for storage is an important part of marketing fruit. Scale for 'Honeycrisp' has been developed. Is popular with Washington growers, and due to unique starch patterns, a separate We are using the Cornell Starch-Iodine Index, which ranks fruit 1-8, with 1 being less ripe, and 8 being fully ripe. The iodine in the test solutionīinds to starch in the fruit: the more purple-black stain on a fruit, the less mature As apples ripen, starch is converted to sugars. After two minutes, fruit can be visually compared to rating The starch-iodine index is a method to assess apple maturity (ripeness).
1992, Predicting Harvest Date Windows for Apples.Ĭornell Cooperative Extension.