Several key grassweeds in NZ have become difficult to control in recent years. Grassweeds compete with crops for water, light and nutrients, and in the case of members of the Bromus genus, harbour the take-all disease.
Trials were designed to determine potential herbicide options for a range of problematic grasses. Some species have been difficult to control with available products and therefore unregistered products have also been tested. The trial uses a log-sprayer and provides an indication of the relative efficacy of different herbicides, at different rates, on a range of grassweeds. FAR is running a trial at the Chertsey Arable Research Site designed to test potential herbicide options for a range of problematic weed species when growing cereal crops.