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Bumblebees ( Bombus  spp.) are important pollinators of mostly self-sterile rabbiteye blueberry ( Vaccinium ashei  Reade). Annual bee colonies start from solitary overwintered queens who emerge in near-synchrony with rabbiteye blueberry bloom. Although colony populations may reach several hundred individuals by midsummer, in early spring most  Bombus  visiting rabbiteye blueberry are queens reared the previous season. Thus, practices that encourage production of queens in summer may increase populations of blueberry pollinators the next spring. In south Georgia, midsummer shortages of nectar-yielding plants may nutritionally limit queen production, and cultured bee forages may help overcome this deficiency. Candidate plants must not compete with the crop for pollinators, and they must be attractive to bees, easy to grow, vigorous, and non-invasive. In 3 years of trials, the following plants have shown promise as supplemental bumblebee forages in south Georgia: Althea ( Hibiscus syriacus ), abelia ( Abelia  × grandifolia ), vitex ( Vitex agnuscastus ), red clover ( Trifolium pratense perenne ), Mexican heather ( Cuphea hyssopifolia ), monkey grass ( Liriope muscari ), summer sweet ( Clethra alnifolia ), and giant sunflower ( Helianthus giganteus ).

SCREENING PLANTS AS SUPPLEMENTAL FORAGES FOR POLLINATING BUMBLEBEES (BOMBUS SPP.)