Can you identify?

Some disease or insect is ruining my green bean leaves. If you know what this is, please leave a comment. The right-hand leaf is shown from the underside, and the veins are brownish/rust colored. The left-hand leaf is brown and kind of curled up at the edge.

How to punish potted plants that do not produce

Off with their heads, and hope they'll come back out from the stump. They usually do return thicker and stronger.