HI Art:  I do not  believe that thinners’ combinations that you used caused the 
fruit not to develop seeds and switching to NAA will not make a difference 
either.    Gala and Cortland are not the best pollinizer, they are partially 
fertile.  Did you have sufficiently active hives in the orchard (1 to 2 per 
acre)?   Also, look very closely at the weather during bloom..  Mosbah

From: apple-crop-boun...@virtualorchard.net 
[mailto:apple-crop-boun...@virtualorchard.net] On Behalf Of Arthur Kelly
Sent: Friday, June 26, 2015 6:29 AM
To: Apple-crop discussion list
Subject: Re: [apple-crop] Seedless apples

Thanks Mosbah,
     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.

Art Kelly
Kelly Orchards
Acton, ME

On Tue, Jun 23, 2015 at 1:06 PM, Kushad, Mosbah M 
<kus...@illinois.edu<mailto:kus...@illinois.edu>> wrote:
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 

 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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