Healthy Fruit, Vol. 26, No. 23, September 25, 2018 - Apple Maturity Report
Jon Clements, Author (unless otherwise noted) and Editor
Horticulture/Apple Maturity Report
More slog weather. 1.32 inches rain yesterday in Belchertown. 7.13 inches in past 30 days. Dew point 70 as I write this. A brief fall intro last weekend, more to come. No frost/freeze in forecast, and the 30-day outlook (as of September 20) calls for an equal chance of above or below normal temperatures.
Honeycrisp are pretty well picked at the UMass Orchard (unless they had ReTain), Cortland and Macoun being actively worked on. Some late Macs (Rogers) left to pick. Flavor, quite frankly, has been a bit bland, too much water.
Disease issues continue to be a bit onerous. Sooty blotch and flyspeck showing up regularly, and suspicious case of leaf spotting on Fuji that I suspect is Marssonina. Significance not clear, but I don’t like it...if anyone else is seeing similar (see pict below) I’d like picts and variety from you.
Sooty blotch and flyspeck on Morning Mist Fuji, 26-September, 2018
Suspect Marssonina infection of Fuji leaves, 26-September, 2018
Note that apple maturity report also continuously updated here: http://ag.umass.edu/fruit/resources/apple-maturity-reports
Morning Mist Fuji
Variable maturity depending on crop load, ready for 1st pick
5 to 7.5
Some water core; ready for 1st pick, very nice
Rogers Red McIntosh
6 (5 to 7)
Final call for CA McIntosh
3 to 4, maybe more
Could use a little more time on tree for brix to be over 12
3 to 4, don’t starch test well
Bitter pit, may have had ReTain
Flavor is bland, likely had ReTain
4 (1.5 to 6)
Sweet and crisp; ready to pick, but maturity is variable; too bad we can’t grow this scab-resistant one!
2 to 3, one a 6
Needs another week
Rogers Red McIntosh
5 (4 to 6)
Rogers is a late McIntosh, could use another week on tree for sure for red color
2 to 7, big range
Over-cropped Honeycrisp = poor quality apples
Harvesting apples in the heat
The starch iodine test doesn’t tell the whole story...
September 19, 2018 - Author: Randy Beaudry, Michigan State University Extension Fruit & Nuts
We are beginning to assess the maturity of some of the traditional “October” apples in the Michigan State University Apple Maturity Program. I have been surprised by the high starch index of some of these varieties that we normally do not expect to see ripening for another two to three weeks (e.g., Red Delicious, Cortland, Mutsu). The ethylene levels, however, are very low—in the parts-per-billion range! This suggests to me that, unlike our earlier apples like Honeycrisp and Gala, which should be headed out of the orchard in the southern half of Michigan, the later varieties are suffering from heat-based dilution of the starch. Read the full article here...
UMass Fruit Advisor: http://umassfruit.com
Scaffolds Fruit Journal: http://www.nysaes.cornell.edu/ent/scafolds/
Network for Environment and Weather Applications (NEWA): http://newa.cornell.edu
The next Healthy Fruit -- if there is one, otherwise see you next year -- will be published on or about October 16, 2018. In the meantime, feel free to contact any of the UMass Fruit Team if you have any fruit-related production questions.