[gawk]

Being this is the first time I have grown cucumbers, I have no idea (yet) what are typical problems growing them so I thought I would ask...

Does anyone have an idea as to what this is on my cucumber leaves?

These are F1 Burpless Tasty Green grown in the greenhouse.

[paintedlady]

I was going to say possibly mosaic virus (common among all the curcubits) but I'm not too sure.  If you turn the leaf over, are there any bugs?  I just wondered if you had some sap sucking insect that was killing off part of the leaf creating those distinctive pock marks?  Sorry I can't be more help.

[gawk]

Thanks paintedlady, I will have a thorough inspection to see if any bugs are around.