look like bite marks.. gone necrotic ...

what are those worms in the bottom right of the top pic??

any chance there was a frost a few weeks back?

ken

Ken, I believe you mean bottom left, and I think those are thrips. And as I said that I did a quick Google for them and have come to the sudden realization/discovery that it is them that may well be the culprit in all this. They can cause quite some damage if not controlled by the looks of it.

Here is a link that might be useful: Thrips

Looks like some sort of sucking pest leading as Ken says to necrotic result after the original damage or bite.

I would not diagnose soil, fertilizer or anything coming up from the soil.

You're right, Butch. After reading up on thrips, it's time to get the big guns out.....