Toxicopathological Determination of Safe Dose Ranges of Neonicotinoids for Honey Bee Colonies
Researcher: Elemir Simko, University of Saskatchewan, Saskatoon SK
Project Code: WGRF-SCDC 2015.125
Final Report: November 2019
Summary: Neonicotinoid insecticides are used as a seed treatment for a variety of crops worldwide, including canola. Those treated crops contain low residues of neonicotinoids in nectar and pollen, however the true impact on honey bee health is disputed and controversial. In a recent three-year project, researchers at the University of Saskatchewan determined safe dose ranges of neonicotinoids on honey bees. The results showed that honey bee colonies appear to tolerate environmental neonicotinoid contamination of nectar and pollen up to 5-10 ng/g; with no demonstrable effects of concentrations similar to those reported worldwide. However, chronic exposure to high environmental doses of 20 ng/g of neonicotinoids (recently reported in Saskatchewan honey and pollen) had negative effects on honey harvest and population of bees in exposed colonies.
Click the links below to download a short version of the report, the full detailed long version of the report, or the related Canola Digest PDF.