[Apple-Crop] Jonagold

[Jon Clements]

FYI

:-) or maybe I would not be smiling if I was growing Jonagold :-(

On Thu, Oct 13, 2016 at 10:06 AM, David Doud <david_doud at me.com> wrote:

> Thank you for this, Glen - it is new information to me - I have been
> twiddling my thumbs waiting for color here, not only on Jonagold, but on
> all the later varieties - tonight will be the first night of the season in
> the lower 40’s/upper30’s - hope that we’ll see some color development soon
> -
> David Doud IN
>
>
> On Oct 13, 2016, at 12:10 AM, Glen Koehler <glen.koehler at maine.edu> wrote:
>
> Hi Art
>     A contributing factor to problems with fruit color this fall has been
> late arrival of minimum temperatures below 42F,   A "rule of thumb" from a
> Cornell bulletin is that optimum coloring conditions require two days with
> low temperature below 42F, followed by a day with high temperature over 68F
> AND over 80% sunlight on that day.
>
>      The Ag-Radar estimate for Sanford 9 miles away from you (far enough
> that I wish we had closer data site, working on that) shows that the two
> days below 42F requirement was not met until September 26, and Sept. 27 had
> a high temperature over 68F.  But the requirement for a day with high
> temperature over 68F AND over 80% sunshine was not met until October 6.
>
>     I don't see this formula as a powerful predictor, esp. since I've seen
> some good color improvement while checking traps and doing fall scab index
> over the past few weeks.   And even if it was a robust predictor, it wasn't
> based on Jonagold.  Still it gives some numbers to possibly help explain
> late coloring conditions this fall.
>
>     Easy to suspect the drought as a contributing factor.  I'm also
> wondering if you used ReTain on these Jonagold.  If so, do you think that
> had any effect on coloring?
>
> - Glen
>
> Glen Koehler
> University of Maine Cooperative Extension
> Pest Management Office
> Voice:  Office 207-581-3882,   Cell  207-485-0918
> 491 College Avenue, Orono, ME  04473
> UMaine Apple IPM <https://extension.umaine.edu/ipm/programs/apple/>
> Ag-Radar <https://extension.umaine.edu/ipm/ag-radar-apple-sites/>
>
> On Wed, Oct 12, 2016 at 2:19 PM, kellyorchards <kellyorchards at gmail.com>
> wrote:
>
>> Why are my Jonagolds not coloring?  Can this be an issue if they have a
>> heavy crop?
>>
>>
>>
>> Art Kelly
>> Kelly Orchards
>> Acton, Maine
>>
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-- 
Jon Clements
aka 'Mr Honeycrisp'
University of Massachusetts Amherst Extension
UMass Cold Spring Orchard
393 Sabin St.
Belchertown, MA  01007
413-478-7219
umassfruit.com
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