I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
I suggest you try using insecticidal soap on the aphids as it works fast and then dries to not harm beneficial insects. The yellowing leaves are usually due to a soil moisture extreme such as too dry or too soggy wet for too long. Mulching may help hold moisture in the soil and reduce the need for watering a bit.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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