I can tell you that bees will indeed feed on grapes that are ripe, especially if there are any split ones. When we harvest, the grape lugs get dozens to hundreds of bees on the grapes. I try to shoo them away carefully while dumping them in the crusher/destemmer. I am highly allergic to bee stings so I carry an epi-pen with me during harvest. Thankfully no need to use it yet. I have had a beekeeper tell me his honey bees won't eat grapes- bullshitake.............. He needs to come see our vineyard at harvest since he has the closest hives to me.
Bees wont touch grapes, most times, except in the bad ways - they may suck the juice right out of the ripe grapes that you were hoping to harvest.. But that's if they dont have adequate stores already, normally.. Yellow Jackets and Hornets are more notorious for it, 'just because'.
They will however, do magic on the 'cover crops' - any clover, alfalfa, mustard, etc
Be careful with spray applications for the vineyard, even up to a few miles away especially if theres GMO corn anywhere; can devastate your bees
I'm interested in the combo, myself.. Been researching all I can
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