The ongoing investigation into honeybee deaths that struck hives across southwestern Ontario this spring has turned up a pesticide used to protect corn and soybean seeds. Thousands of dead bees were found in piles outside hives in early May, triggering an investigation by Health Canada and the province's agriculture and environment ministries. An agriculture ministry spokeswoman said Health Canada found residues of the insecticide clothianidin in 28 of 37 samples of bees from various sites.
Source: Cnews, 28 May 2012
http://cnews.canoe.ca/CNEWS/Environment/2012/05/28/19807001.html
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