Article

Bulletin of Environmental Contamination and Toxicology

, Volume 85, Issue 3, pp 229-234

Field Trial for Evaluating the Effects on Honeybees of Corn Sown Using Cruiser® and Celest xl® Treated Seeds

  • Paolo TremoladaAffiliated withDepartment of Biology, University of Milan Email author 
  • , Marta MazzoleniAffiliated withDepartment of Biology, University of Milan
  • , Francesco SaliuAffiliated withDepartment of Landscape and Environmental Sciences, University of Milano-Bicocca
  • , Mario ColomboAffiliated withDepartment of Protection of Urban and Agri-Food Systems and of Biodiversity Valorisation, University of Milan
  • , Marco VighiAffiliated withDepartment of Landscape and Environmental Sciences, University of Milano-Bicocca

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Abstract

A first field study was conducted to investigate the possible adverse effects that seeds dressed with neonicotinoid insecticides pose to honeybees during sowing. It was observed that in the exposure hives bee mortality increased on the day of sowing and that the number of foraging bees decreased the days after the sowing. The corn sowing posed a significant threat to honeybees, with thiamethoxam being the most probable toxic agent. A theoretical contact exposure was calculated for a bee when flying over the sown fields, revealing a dose of 9.2 ng bee−1 close to the contact LD50 of thiamethoxam.

Keywords

Neonicotinoid insecticides Honeybees health Pesticide exposure Colony collapse disorder