Weeds at risk of developing herbicide resistance in the different cropping systems of the northern region

Abstract

Herbicide resistance is an increasing concern in the northern grain region with 10 weed species confirmed resistant in the last decade. A new project is identifying additional weeds and cropping systems that are at risk of developing resistance in the near future. This is being achieved by collating information and calculating a risk score for each main weed based on herbicide use patterns for the different crop rotations across the region. Several examples are presented for the main in-crop and fallow weeds of southern Queensland.