Wild radish management and strategies to address herbicide resistance
Wild radish (Raphanus raphanistrum) is one of the most widespread and competitive broadleaf weeds of Australian cereal-growing regions. Increasing resistance to multiple herbicide modes of action is forcing the adoption of diverse and integrated weed-control strategies by growers dealing with this weed.
- Wild radish is one of the most widespread and competitive weeds of grain cropping.
- Wild radish has developed resistance to many herbicide modes of action. Many Western Australian growers have only one effective herbicide remaining.
- Resistance to phenoxy herbicides is widespread in WA and is also present in the eastern states.
- Populations resistant to glyphosate have recently been confirmed.
- Wild radish has significant seedbank dormancy: one year of seed allowed to go into the soil can mean more than six years of subsequent weed germinations.
- Often multiple germinations or cohorts occur each season.
- Seed can be captured at harvest and destroyed.
- The focus must be on preventing seed return to the seedbank. Effective management is based on control strategies that drive down weed seed numbers in the soil over time. This will require an integrated program of herbicide and non-herbicide tactics such as harvest weed-seed control and crop competition.
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GRDC Project Code ICN00016
Region National, North, South, West
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