Are you sure they are bumble bees? There are some bees that don't usually sting but are great for pollinating. Shoot! I can't think of their name right now. I would call a beekeeper to help you.
Are you thinking of the Mason Bee? Sometimes called the Orchard Bee. They are docile and only sting if stepped on. Better pollinators than Honey Bees. There was an article on them in Texas Farm and Home magazine.
David
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