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Study confirms ST exhaust as bee hazard

A two-year study by researchers from the US Purdue University (West Lafayette, Indiana) has identified seed treatment residues in planter exhausts as a previously unrecognised hazard to honeybees . The researchers tested dead bees collected from hives located close to maize fields for the neonicotinoid insecticides, clothianidin and thiamethoxam. They found “extremely” high levels of the insecticides in waste talc exhausted from planting machinery. Lower, sub-lethal levels of the insecticides were also found on marginal weed flowers and in maize pollen for up to two years after treated seed was planted. Soil in treated and nearby untreated fields was also contaminated.



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