Because of serious weed concerns with the area’s over 10 million acres of wheat and barley grown with extremely limited rainfall, Western Australia is the herbicide-resistance capital of the world.
With the popular weed killer in legal straits in the U.S., no-tillers say they’d turn to other chemicals, rollers or other options. But most won’t give up on cover crops.
Glyphosate has been invaluable to no-tillers in North America and overseas as an inexpensive, effective tool for not only killing weeds but also terminating cover crops ahead of or after planting.
When we launched No-Till Farmer in 1972, paraquat was the No. 1 burndown herbicide. While it has lost much of its popularity to glyphosate, Mark Loux says it is one of those herbicides (marketed as Gramoxone by Syngenta) that could have been used much more in recent years to help control marestail and to interrupt the continuous glyphosate use cycle. The Ohio State University weed scientist says paraquat is most effective on small annual weeds.
Crop rotations and residual herbicides can help no-tillers diversify modes of action against resistant weeds and protect what remains of glyphosate’s effectiveness.
California is planning to add glyphosate to its list of cancer-causing chemicals after the World Health Organization classified it as a probable human carcinogen.
With more weeds becoming herbicide-resistant, a longer-term perspective on weed management is important to preserve the value of these technologies, says Penn State Extension.
Palmer amaranth, kochia, marestail, you name it — populations of glyphosate-resistant weeds are popping up more frequently, and it looks like no-tillers are taking note of it.
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On this episode of Conservation Ag Update, brought to you by Yetter Farm Equipment, we get the scoop on the benefits of planting green with Jackson, Wis., no-tiller Ross Bishop.
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