The region in NB where this issue is occurring is the hub for NB's and North America's forestry industry. Over 40% of all harvested forest land in NB is treated with glyphosate [0].

Commercial forestry at JD Irving's scale largely died out in much of the US excluding Maine (where it is also has inordinate political power [1][2]).

[0] - https://www.conservationcouncil.ca/wp-content/uploads/2019/0...

[1] - https://themainemonitor.org/maines-future-with-irving/

[2] - https://mainebiz.biz/article/the-irving-influence-a-look-at-...