Grass weeds were the focus of the afternoon session of the recent Irish Tillage and Land Use Society (ITLUS) conference. One of the most notable grass weed experts, Stephen Moss (recently retired from Rothamsted in the UK), gave an outline of the main problems and the increasing challenges of control.

Given the history of the development of herbicide resistance in blackgrass, Stephen stated frequently in his presentation that one should not, and cannot, rely on chemicals as the sole control mechanism. While the problem is worse in blackgrass, because it out-crosses at flowering, the risk of resistance is real for all grass weeds and chemical resistance has already been found in most weeds.