Herbicide-resistant waterhemp is a rapidly growing problem for Canadian soybean growers. Once established, waterhemp can be tough to manage because, biologically speaking, it has a lot of tools in its arsenal that help it adapt and thrive, no matter what you throw at it.
There are three tools in particular that make waterhemp such a formidable foe and the king of herbicide resistance: abundant seed production, genetic diversity and a highly competitive growth habit.
More specifically, one waterhemp plant can produce somewhere around 250,000 seeds when growing in a competitive crop environment, and as many as a million seeds or more when not challenged by other plants.
As well, those seeds are genetically diverse from one another; a result of the fact that waterhemp does not self-pollinate and requires both male and female plants to reproduce.
And finally, waterhemp is an incredible field competitor – seeds germinate all season long and grow incredibly fast (2.5 cm to 3 cm per day) – making it a difficult target for herbicides.
Ultimately, herbicide resistance is a numbers game – the more seeds a plant can produce and the greater their capacity for survival, the greater the chance that herbicide resistance will develop. That’s waterhemp in a nutshell. Its ability to survive and adapt is why most waterhemp populations in Canada carry resistance to two or more herbicide groups, including:
The Enlist™ weed control system, with Brevant® seeds Enlist E3™ soybeans, can be a powerful tool when it comes to effectively managing waterhemp because it brings two new herbicide options to the table. You can choose:
Both herbicides can be applied from pre-plant up to the R2 stage, so you have the flexibility to go after late flushes of waterhemp. They also contain Colex-D™ technology for near-zero volatility and low drift – they stay where they’re sprayed.
Brevant seeds Enlist E3 soybeans complete the picture. An advanced seed with high yield potential and robust herbicide tolerance to 2,4-D, glyphosate and glufosinate, Brevant seeds Enlist E3 soybeans are a powerful match against resistant waterhemp, particularly:
Brevant seeds Enlist E3 soybeans paired with Enlist herbicides are powerful tools for soybean growers looking for an answer to resistant waterhemp. This weed is a proven competitor – but that doesn’t mean it gets to win.