Publications for:

pest = Xanthium strumarium (weed)
crop = Maize/corn (Zea mays)
country = Canada (east)

found 2 publications:

2010

Control of common cocklebur (Xanthium strumarium L.) in corn
Canadian Journal of Plant Science (2010) 90 (6), 933-938
publishers website - pestinfo wiki

2003

Correlations among relative crop and weed growth stages
Weed Science (2003) 51 (2), 163-170
publishers website - pestinfo wiki