Not that it's really relevant, but here in Oz we have a bee called the Blue-banded Bee, just slightly smaller than the European Honey Bee,that just adores tomato blossoms. They land on them then buzz them to make the pollen fall out. They also love melon flowers and, at least where I am, we get great melon set. There is also a very small bee, probably similar to your sweat bee, which loves all the flowers that the European Honey Bee ignores, especially tomato and melon flowers.
It's great for fruit set but a nuisance for seed saving!
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Ray
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