Art: Many factors contribute to poor color in “Jonagold” and other varieties
1. “Joangold” is not a high coloring cultivar, except in excellent sites
where it can get adequate cool nights and warm (but not hot) days at least one
month before harvest.
2. “Jonagold” is a vigorous tree. Adequate pruning is a must for good
3. Heavily fertilized trees produce poor color fruits.
4. High temperature and high humidity during coloring will reduce fruit
5. I have seen young trees produce good color fruits compare to older
trees, but I have also seen the opposite, which gets back to tree management..
6. I am not sure heavy crop load impact fruit color much . I would assume
the opposite.. A tree that has a heavy crop load is likely to have less shaded
7. In my opinion the key players are inadequate pruning and hot and humid
weather before harvest.
8. I have seen a NW grower mist a “Jonagold” block to increase color
through evaporative cooling. Not a good practice if you live in a humid area..
Mosbah Kushad, University of Illinois
From: apple-crop [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of
Sent: Wednesday, October 12, 2016 1:20 PM
Subject: [Apple-Crop] Jonagold
Why are my Jonagolds not coloring? Can this be an issue if they have a heavy
apple-crop mailing list