Cuke leaves turning brown - part 1

Northfield, MN(Zone 4a)

Like many, this is my first year trying to grow veggies. I have planted a cucumber in a very large pot (didn't have room for a hill to plant it on). All was going well until about 5 days ago when I noticed some dry brown spots starting to appear on the leaves. The dry areas are expanding so I'm starting to get worried it's more than just some growing pains. Here is a picture of the plant. In my next post, I'll show a closeup of the leaf. Hoping someone can help me determine what is going wrong here and how I can address it organically. Thanks in advance for your help!

Thumbnail by bmblsad
Northfield, MN(Zone 4a)

Here is the second picture that is a closeup of the leaf. Any ideas on what this is and what I should do?

Thumbnail by bmblsad
Glen Ellyn, IL(Zone 5b)

The only thing it makes me think of is angular leaf spot.

But I'm far from entirely confident in the diagnosis.

Liberty Hill, TX(Zone 8a)

This is a long shot but it looks like sun scorch to me. Are they in an area that they get a lot of sun or heat? Looking at your zone I don't know if that is even possible.
Lisa

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