Free access
Volume 34, Number 3, May-June 2003
Page(s) 207 - 216
Apidologie 34 (2003) 207-216
DOI: 10.1051/apido:2003009

Osmia cornuta (Hymenoptera, Megachilidae) as a pollinator of pear (Pyrus communis): fruit- and seed-set

Bettina Maccagnani, Edith Ladurner, Fabrizio Santi and Giovanni Burgio

DISTA - Area Entomologia, Università di Bologna, Via Fanin 42, 40127 Bologna, Italy
(Received 25 January 2002; revised 10 September 2002; accepted 22 September 2002)

To investigate the possibility of pollinating `Abate Fetel' and `Max Red Bartlett' pears with O. cornuta, different pollination treatments were compared in 1998 and 1999: (1) trees caged with O. cornuta bees; (2) open pollination - uncaged trees located at various distances from O. cornuta nesting shelters; (3) trees caged without bees. O. cornuta was the most abundant pollinator species in the orchard (97.6% of the observed insects). Caged trees pollinated by O. cornuta set significantly more fruitlets and matured more fruits than caged trees without pollinators. The fruitlet- and fruit-set in open-pollinated trees was intermediate between caged trees with O. cornuta and caged trees without bees in `Abate Fetel' in 1998 and `Max Red Bartlett' in 1999, but did not differ from fruitlet-set in non-pollinated trees in the other two variety-years. Open-pollinated trees had seed-sets comparable to caged trees with O. cornuta. The pollen provisions stored in O. cornuta nests were almost exclusively composed of Pyrus pollen. As evidenced by traces of Prunus pollen some O. cornuta foraged 400 m away from the nesting shelters.

Key words: Osmia cornuta / pollination / fruitlet-set / fruit-set / Pyrus communis

Correspondence and reprints: Edith Ladurner

© INRA, EDP Sciences, DIB, AGIB 2003

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see You should disable this module if you wish to use the OpenURL server that you or your library have defined.