Answer: Based on your description I am not able to diagnose the specific cause of the yellowing. It might be due to a disease or insect problem, poor rooting, poor planting technique, under or over watering, or a soil problem. I would suggest you work with your local county extension to try to determine the cause of the yellowing. Based on knowing that, you can determine how to proceed. I'm sorry I can't be more specific for you long distance.
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