Wild oats have developed resistance to a number of different herbicide actives in some fields. Figure 3: Control levels in resistant (R1 to R4) populations of Italian ryegrass to ACCase Stratos Ultra, Falcon and Axial Pro and ALS Broadway Star and Pacifica® Plus, all applied at recommended label rates. Previous Next Problem grass weeds such as wild oats, sterile brome, Italian ryegrass and blackgrass are increasing in tillage fields. They are very competitive, can cause yield losses of over 80% and can explode in numbers if left uncontrolled. Weed control generally involves a combination of herbicide and cultural tools. The ACCase (Group A) and ALS (Group B) herbicides are most commonly used for selective grass weed control (Table 1).