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1 INTRODUCTION Weeds are a major driver of biodiversity loss; for example, in New Zealand they contributed to the decline of 30% of its threatened plant species.1 They have caused nearly 200 documented global extinctions and threaten thousands more.2 Economically, they impose significant burdens, with estimated global costs from control efforts and yield losses exceeding $163 billion annually.3, 4 Most weed management focuses on mitigating impacts from widespread species, yet these reactive...
The authors would like to thank the grower who identified their vineyard as potentially having glyphosate-resistant wild carrot plants. We would also like to thank Yuichi Ando for assisting with field surveys, Bridget Wise for assisting with glasshouse experiments and plant maintenance and Mike Cripps and Graeme Bourdôt for their comments on the paper. No potential conflict of interest was reported by the author(s).
1 INTRODUCTION Ryegrass (Lolium sp.) is a key forage crop species in New Zealand and is a key component of pastures which cover approximately 39% of the country. Lolium species are also globally important as forages and turfs. Ryegrass provides 14 billion New Zealand dollars (NZD) toward the country's gross domestic product (GDP) per annum (2012 estimate).
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