The Persistence of Glyphosate in Vegetation One Year after Application

Glyphosate-based herbicides are the most widely used in world, including Canadian forestry. In general, glyphosate-based considered relatively non-toxic to wildlife species due, part, rapid breakdown of chemical environment. However, recent work has shown that glyphosate can persist for at least one year after application low concentrations leading concern over persistence trace levels Using two independent studies we characterize short- (18 days) and long-term (1 year) vegetation which commonly, but differentially, browsed by WhiteiTailed Deer (Odocoileus virginianus), Moose (Alces alces), Black Bear (Ursus americanus), or as traditional medicines Indigenous people compare residues exposure thresholds. short-term study, within block exceeded general maximum residue level (MRL) fresh fruit set Health Canada (0.1 ppm) up 18 days application. were above MRL week below month Under assumptions all contained highest observed concentration, animals only consume from herbicide treated areas, physiological daily, Moose, White-Tailed Deer, Bears could exceed Acceptable Daily Intake (0.3 mg/kg/day) Subsequently, given dissipation vegetative matrices this consider it highly unlikely herein enough throughout their lives pose a risk health. Overall, our demonstrate application, however, wildlife. We caution operational practices typically imposed forestry very important effective minimizing risk.