I have green beans planted and growing up a trellis along a fence. They shot right up the trellis and even snaked themselves through the cracks in the fence. I recently noticed that some of the plants have yellowing leaves with little brown spots down at the base. I pulled them, but the problem seems to be moving up the plant and spreading to some of the neighbors.
These beans are in the same bed as my cucumbers (and everything else). So I'm wondering if it's soil and/or sun related. And how full should these beans be? Mine are not very thick with leaves.
Here's another blurry cell phone pic or two.

