What I think they tried to get across was: Bumble bees for use in greenhouses, Honey bees for use with field crops.
Sometimes we all somehow get messed up when we try to say something and it doesn't come out quite right.
The winter before last, I loaned one of my sons a few hives for pollination in his greenhouses. He hoped to save the cost of buying commercially raised bumble bees to do the job. Unfortunately, the bees didn't do a good job at all and they returned home as considerably weakened hives. Bumble bees are simply more suited for the indoor work than are honey bees.