Italian ryegrass infestation in winter wheat. Photo compliments of Virginia Tech.
Over the last few years, several residual herbicides are now labeled for weed control in wheat and sometimes barley. These herbicides are labeled either preplant or perhaps early postemergence and can target special weed problems such as winter annual grasses or problematic broadleaves. Table 1 is a brief summary of what’s available for this type of application. For the full list of available herbicides and their comments, see Table 2.5-7 in the Penn State Agronomy Guide or Table 5-7 in the Mid-Atlantic Field Crop Weed Management Guide and for effectiveness ratings of fall planted small grain herbicides on winter annuals see Tables 2.5.5 or 5.5 in the same Guides.