Holes in Cuke Leaves

[Winemaker]

I have Tomatoes and Cukes in Earthtainers. No problems with the Tomatoes but my Cukes are getting lots of holes in the leaves. I have picked leaves and inspected with magnifying glass but really can't see the culprits. I have sprayed with Take Down on tops and bottoms of leaves but new leaves are still having probs. Could this be some sort of worm only operating at night? Should I use a Thuricide? Here are some pics.