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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).
Teagasc has said that Sterile Brome is becoming a particular problem in Irish cereal crops.
Control and management of the weed will require a combined reliance on integrated pest management (IPM) techniques and the targeted use of chemical treatments.
Ongoing trials at Teagasc indicate that herbicides, on their own, do not deliver the control of Sterile Brome that cereal growers would want.
“It’s a case of knowing the lifecycle of the weed,” said Teagasc’s Jimmy Staples.
Sterile Brome is a late summer / autumn germinating weed. So pushing back sowing dates would be strongly advised in fields where the weed is a problem.