Ghanizadeh, H., Harrington, K., James, T. and Woolley, D. 2014. A glyphosateresistant perennial ryegrass population is also resistant to amitrole. New Zealand Plant Protection. 67, (Jan. 2014), 331–331. DOI:https://doi.org/10.30843/nzpp.2014.67.5779.