To evaluate residual control of autumn emergence of summer grasses in fallow.

Glyphosate resistance is increasingly common in awnless barnyard grass. Effective and economic summer fallow management often requires residual chemistry to reduce weed numbers and manage multiple weed flushes. A challenge observed in recent seasons is that the residual efficacy is often waning in late summer or early autumn. Where glyphosate resistance populations are present, growers have very limited tools for knockdown management of barnyard grass prior to winter cereal planting.

This trial was designed to evaluate the potential of residual herbicides when applied in late summer or early autumn for barnyard grass management prior to winter crop planting.