The document you are referring to, , is a scientific study published in PLoS ONE titled Chronic Exposure of Imidacloprid and Clothianidin Reduce Queen Survival, Foraging, and Nectar Storing in Colonies of Bombus impatiens.
Compare the survival rates of queens across different dosage groups. Download 91573 plus pdf
: Sublethal exposure led to reduced nectar storage and diminished foraging activity, which can lead to colony collapse even if the bees do not die instantly. The document you are referring to, , is
: While low doses (less than 10 ppb) typical of seed-treated crops did not immediately kill queens, higher doses (20 ppb to 100 ppb) commonly found in ornamental plants and certain spray-treated crops significantly increased queen mortality by the end of the study. : While low doses (less than 10 ppb)
: These findings highlight that current regulatory assessments may underestimate the risk of systemic insecticides by failing to account for chronic, season-long exposure. Drafting the Long Paper