There are increasing cases of herbicide-resistant grass weeds in New Zealand. Herbicide efficacy trials play a key role in understanding shifts in resistance.
This Update describes 2022 data from FAR’s ongoing herbicide screening trial at Chertsey, mid-Canterbury, where the efficacy and crop safety of a number of new and old herbicides were tested against several problematic weed species and in a number of common crops. This is the second consecutive year that FAR has run this trial, after taking a nine-year hiatus from this kind of work.