[Apple-Crop] Jonagold

[Allen Teach - Sunrise Orchard]

Hello Art,
Did your Jonagold receive Retain?   The old strains of Jonagold here did not color with proper crop load and I attributed it to the one third rate of Retain applied.  Retain was particularly effective here this year preventing Mac drop so I am thinking it may have really imposed color drag on Jonagold. Macs colored acceptably well this year even with Retain and Cortland did very well.

Allen Teach
Sunrise Orchards Inc.
Gays Mills,WI

From: Evan B. Milburn 
Sent: Thursday, October 13, 2016 5:34 AM
To: Apple-Crop discussion list 
Subject: Re: [Apple-Crop] Jonagold

Welcome to Southern living and growing jonagold.  The old original strain will never get color this far south. The newer strains will be about like your original strains if we are lucky enough to have some cooler nights and sunny days.
Cold nights, sunny days AND good pruning will get you color. 





On Thursday, October 13, 2016 12:12 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
  Ag-Radar

  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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