Chrysanthemum leaves are turning yellow

Eutaw, AL(Zone 8a)

A few leaves at the bottom of each of my heirloom chrysanthemums, (Cathy's Rust), are turning yellow with dark areas. They had a lot of aphids at the tops of the stems several weeks ago, but I pinched those parts of the stem off and the aphids now seem to be gone. The plants have really multiplied since I planted them last summer. What could be causing the leaves to turn yellow? What might resolve this problem? Thank you.

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