Gardening question

[SeaRay]

I have a small raised garden in my back yard. I had several Zucchini plants that were blooming with promise.

I walked by yesterday and all the blooms were gone. This is what I saw.

We had a fellow doing some trimming in the yard and I was ready to accuse him or his helper of pruning my plants, but my wife is convinced it was cut worms. Whatever it was the stems are trimmed as neatly as if they were clipped with a printer. See the stalks with the trimmed off tops?
What y'all say? Cut worms??