Here's another image of the strange black spots. Again, any help is most appreciated! Thank you!

Where do you live in zone 9 that gypsy moths are a problem?

Anyway, it certainly looks like caterpillar frass. And the leaves are being devoured should be a sign of caterpillars. But what makes you think that the culprits are gypsy moths?

Hi Rhizo! Thank you so much for responding!

I got the idea just doing a general search on black spots on cuke leaves. I've not seen any caterpillars (lizards are a more frequent visitor to our garden area) nor moths ~ I just assumed.

I'm in Panama City Beach, if that makes a difference.

Again, thank you!

Whoops! Just realized that I'm zone 8b ... if that makes a difference. :/

Unless you manage to find the actual producer of all of that poop, we can't ID it for you. It won't be a gypsy moth, though. :-)

The Bt can be effective in controlling caterpillars while they are still young.

The only thing that Zone tells us is which plants will most likely survive a normal winter in your garden, beyond that it is meaningless since it tells us nothing of what kind of soil you may have, how much rainfall you may get, what kinds of insects you may have, etc.

The larva of the Gypsy Moth will eat the leaves, as well as leave large quantities of frass (a nice word for poop) so you will know they are present because your trees and shrubs will fairly quickly become bare. Same with the Tentworm Caterpillars. I find nothing that would indicate that either of these is a pest of the squash family of plants.

Gypsy moths don't occur in Florida.