Free Access
Volume 36, Number 3, July-September 2005
Page(s) 449 - 460
Published online 09 August 2005
Apidologie 36 (2005) 449-460
DOI: 10.1051/apido:2005032

Assessing delayed and acute toxicity of five formulated fungicides to Osmia lignaria Say and Apis mellifera

Edith Ladurnera, Jordi Boschb, William P. Kempc and Stefano Mainia

a  Dipartimento di Scienze e Tecnologie Agroambientali, Area Entomologia, Università di Bologna, Viale Fanin 42, 40127 Bologna, Italy
b  Biology Department, Utah State University, Logan, UT 84322-5310, USA; and Unitat d'Ecologia/CREAF, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
c  USDA - ARS, Bee Biology and Systematics Laboratory, Logan, UT 84322-5310, USA

(Received 15 September 2004 - Revised 10 December 2004 - Accepted 6 January 2005; Published online: 9 August 2005)

Abstract - The delayed and acute toxicity of benomyl (Benlate®), captan (Captan 50WP), iprodione (Rovral®), propiconazole (OrbitTM), and neem oil (Trilogy®) to two crop pollinators, A. mellifera and O. lignaria, was evaluated. Survival after contact and oral single exposure to high doses of the pesticides was compared to survival of controls with the dosing vehicle. LD50 values at 24, 48 and 72 h from exposure were determined. Contact and oral exposure to benomyl and iprodione did not affect survival of any of the two species. Contact exposure to neem oil affected survival of A. mellifera. Orally administered propiconazole showed delayed and acute toxicity to both species. Captan severely limited survival of O. lignaria. The tested fungicides seemed to be safe to both bee species at the recommended rates, with the exception of captan to O. lignaria. To our knowledge, this is the first complete contact and oral toxicity test on an Osmia species.

Key words: Osmia lignaria / Apis mellifera / toxicity / fungicide / LD50

Corresponding author: Edith Ladurner

© INRA, DIB-AGIB, EDP Sciences 2005