Blueberry

High-bush blueberries are self-fertile, but the produced berries will be small, slow to ripen, may drop off, and most are considered to be none marketable. Blueberries benefit considerably from cross-pollination. Cross-pollination refers to pollen transfer between cultivars of the same species and is achieved by honeybees and bumblebees while they fly from row to row.

Bumblebees are efficient at pollinating blueberries with activity at lower temperatures than honeybees. Bumblebees, compared to honeybees, make faster visits to flowers transferring a higher rates of pollen at each visit.  Fruits are larger, more evenly ripened and yields are increased.