Deckers T., Schoofs H. (2002): Improvement of fruit set on young pear trees cultivar conference with gibberellins. Acta Horticulturae (ISHS), 596: 735–743. https://doi.org/10.17660/ActaHortic.2002.596.126 Free J.B. (1993): Insect Pollination of Crops (2nd Ed.). London, Academic Press. Geslin B., Aizen M.A., Garcia N., Pereira A.J., Vaissière B.E., Garibaldi L.A. (2017): The impact of honey bee colony quality on crop yield and farmers’ profit in apples and pears. Agriculture, Ecosystems & Environment, 248: 153–161. Jacquemart A.-L., Michotte-Van Der Aa A., Raspé O. (2006): Compatibility and pollinator efficiency tests on Pyrus communis L. cv. ‘Conference.’ Journal of Horticultural Science and Biotechnology, 81: 827–830. https://doi.org/10.1080/14620316.2006.11512145 Kemp H., Koskela E., Van Dieren M.C.A., Maas F.M. (2008): Selected Pyrus genotypes as pollinizers for Pyrus communis cultivars. Acta Horticulturae (ISHS), 800: 189–197. https://doi.org/10.17660/ActaHortic.2008.800.20 Lundberg H. (1980): Effects of weather on foraging-flights of bumblebees (Hymenoptera, Apidae) in a subalpine/alpine area. Holarctic Ecology, 3: 104–110. https://doi.org/10.1111/j.1600-0587.1980.tb00715.x Moriya Y., Takai Y., Okada K., Ito D., Shiozaki Y., Nakanishi T., Takasaki T. (2005): Parthenocarpy and self- and cross-incompatibility in ten European pear cultivars. Journal of the Japanese Society for Horticultural Science, 74: 424–430. https://doi.org/10.2503/jjshs.74.424 Potts S.G., Biesmeijer J.C., Kremen C., Neumann P., Schweiger O., Kunin W.E. (2010): Global pollinator declines: trends, impacts and drivers. Trends in Ecology & Evolution, 25: 345–353. Quinet M., Jacquemart A.L. (2015): Differences between pollination and parthenocarpy in the ‘Conference’ pear. Acta Horticulturae (ISHS), 1094: 359–366. https://doi.org/10.17660/ActaHortic.2015.1094.45 Quinet M., Warzée M., Vanderplanck M., Michez D., Lognay G., Jacquemart A.L. (2016): Do floral resources influence pollination rates and subsequent fruit set in pear (Pyrus communis L.) and apple (Malus × domestica Borkh) cultivars? European Journal of Agronomy, 77: 59–69. Silva L., Herrero M., Oliveira C.M. (2008): Effects of gibberellic acid and pollination on fruit set and fruit quality in “Rocha” pear. Acta Horticulturae (ISHS), 800: 199–203. https://doi.org/10.17660/ActaHortic.2008.800.21 Stern R.A., Goldway M., Zisovich A.H., Shafir S., Dag A. (2004): Sequential introduction of honeybee colonies increases cross-pollination, fruit-set and yield of ‘Spadona’ pear (Pyrus communis L.). Journal of Horticultural Science and Biotechnology, 79: 652–658. https://doi.org/10.1080/14620316.2004.11511821 Vercammen J., Gomand A. (2008): Fruit set of ‘Conference’: A small dose of Gibberellins or Regalis. Acta Horticulturae (ISHS), 800: 131–138. https://doi.org/10.17660/ActaHortic.2008.800.11 Vercammen J., Gomand A., Goossens H. (2011): Cultivar Testing of pears in Belgium. Acta Horticulturae (ISHS), 909: 171–176. https://doi.org/10.17660/ActaHortic.2011.909.17 Warnier O. (2000): Quel est l’interet d’une pollinisation croisee pour la poire Conference. Le Fruit Belge, 484: 47–50. (in French) Zhang C., Lee U., Tanabe K. (2008): Hormonal regulation of fruit set, parthenogenesis induction and fruit expansion in Japanese pear. Plant Growth Regulation, 55: 231–240. https://doi.org/10.1007/s10725-008-9279-2 Zisovich A., Goldway M., Schneider D., Steinberg S., Stern E., Stern R.A., Sde-Eliyahu K. (2012): Adding bumblebees (Bombus terrestris L., Hymenoptera: Apidae) to pear orchards increases seed number per fruit, fruit set, fruit size and yield. Journal of Horticultural Science and Biotechnology, https://doi.org/10.1080/14620316.2012.11512876