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Not quite the same, but pretty cool:

https://www.youtube.com/watch?v=vGjP9SE7tsM

I think that may be a really good project. I’m pretty sure if you could make it work properly, a lot of organic farmers would invest into such a solution.

Isn't spraying salt over your organic farm counter-productive?

Might be able to replace the salt with something like fertilizer beads.

Then it might not do the best work on slugs.

Flying or on treads?

Maybe somthing like skycam[0]? That could have some gripper to just move snails into some container.

[0]https://en.wikipedia.org/wiki/Skycam

Having to rig that up sounds too labor intensive for widespread adoption.

Flying sounds like a battery hog / needs to report home.

But if you out it on treads, it can leisurely roll around your garden / any sized plot and blast slugs as it sees them. Put some solar panels on it and it could possibly stay out all day.