Post emergent herbicides

Part 1: Spray small radish twice

Western Australian research reveals that careful timing, effective application and using different herbicide groups are more important than product choice for controlling wild radish. A range of herbicide combinations can provide effective control of herbicide-resistant wild radish if small plants were sprayed twice and attention is given to achieving good herbicide coverage. Peter Newman (Australian Herbicide Resistance Initiative) and agronomist Grant Thompson (Crop Circle Consulting) discuss the results of their wild radish research.

Resources

• Spray resistant radish early for best efficacy and yield (Grant Thompson, Crop Updates paper 2014)
• Herbicide resistant wild radish (Peter Newman)
• Controlling herbicide resistant Wild Radish in wheat in the Northern Agricultural Region of WA with a two spray strategy (Peter Newman)
• Diverse weed control: Left jab, right hook (AHRI insight)

Part 2: When is it worth rotating from clethodim (Select®) to butroxydim (Factor®)?

Is there any value in rotating the post-emergent herbicides clethodim (Select®) and butroxydim (Factor®)? The research suggests that Factor® will sometimes kill plants that are moderately-resistant to Select® that could help in driving down the weed seed bank. Dr Peter Boutsalis from the University of Adelaide discusses his latest research and observations using both products with AHRI’s Peter Newman.