The trees are in good vigor, there was good bee activity and
pollination weather, the next row of either Gala or Cortland have good
fruit set and seed counts. I'm wondering about the effect of thinners. We
used Amid at 50 ppm (TRV) at petal fall and then 100 ppm (TRV) Maxcel plus
Carbaryl 16 days later at about 12 mm. In the past we have used NAA at 5
ppm with the Carbaryl with the same effect and I had thought the NAA might
be the culprit.
On Tue, Jun 23, 2015 at 1:06 PM, Kushad, Mosbah M <kus...@illinois.edu>
> Hi Art: The “Macoun” variety is a self-sterile apple, like ”Jonagold”.
> It needs a pollinizer close-by to set a full crop. Jonathan, Granny
> Smith, Elstar, Grimes Golden, and most crab apples will pollinate Macoun.
> As for the seeds, they are needed for fruit set and for larger fruit size
> because they produce the hormone auxin, which makes the cells grow bigger.
> If you see a lopsided fruit, chances are the bulgy cheek has viable seed(s)
> but not the other side. Most varieties will drop their fruit if there are
> no seeds, however some varieties like Macoun will set seedless fruits of
> small size. If there are plenty of pollinizers nearby, but the fruits did
> not set seeds, then blame it on the weather that may have kept the bees
> from bringing pollens from the pollinizer trees. I have seen many fruits
> on the ground in central Illinois this spring because of the heavy rain and
> cold weather that we had during bloom, which kept the bees in their hives.
> Mosbah Kushad, University of Illinois
> *From:* apple-crop-boun...@virtualorchard.net [mailto:
> apple-crop-boun...@virtualorchard.net] *On Behalf Of *Arthur Kelly
> *Sent:* Tuesday, June 23, 2015 11:00 AM
> *To:* Apple-Crop
> *Subject:* [apple-crop] Seedless apples
> Does anyone have any input as to why my Macoun apples fail to develop
> seeds? The seeds wither but the apples stay and are harvested. They
> develop fair size but I can't help but think it would be better if they had
> a full compliment of seeds. The Cortland and Gala on either side have a
> full compliment of seeds and size well with moderate thinning.
> Art Kelly
> Kelly Orchards
> Acton, ME
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