Publications for:

pest = Cirsium arvense (weed)
crop = Alfalfa/lucerne (Medicago sativa)
country = Canada (west)

found 2 publications:

2004

MON-37500 for weed control and alfalfa seed production
Weed Technology (2004) 18 (3), 810-815
publishers website - pestinfo wiki

2003

Preharvest glyphosate in alfalfa for seed production: Control of Canada thistle
Canadian Journal of Plant Science (2003) 83 (1), 199-204
publishers website - pestinfo wiki