Actually Kylie in a citizen science naturemapr assisted study of Canberra's pollinators we found that 79% of the recorded flower visitations by the European bee were on exotic flowers. But I don't want to sing their virtue as the European bees was a major pollinator of several weed species including Echium species (53% of all recorded visitations on this genus), Spear Thistle (Cirsium vulgare - 50%), St John’s Wort Hypericum perforatum - 30%) and the Dandelion Group (17%).
wow. that is so interesting MichaelM. They are so much bigger than most of the native bees that when I see them together they just seem to come in a push the native ones out of the way. But whether the native bees would polinate fruit trees or veggies I don't know, and I do like fruit and veg. Kylie TY :)