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In 2009, Canada identified its first resistant weed, giant ragweed, and at that time 15 weed species had been confirmed as resistant to glyphosate. [ 188 ] [ 195 ] As of 2010, in the United States 7 to 10 million acres (2.8 to 4.0 million hectares) of soil were afflicted by herbicide-resistant weeds, or about 5% of the 170 million acres planted ...
From 2005 through 2010 researchers discovered 13 different weed species that had developed resistance to glyphosate. From 2010 to 2014 only two more were discovered. [7] A 2013 Missouri survey showed that multiply-resistant weeds had spread. 43% of the sampled weed populations were resistant to two different herbicides, 6% to three and 0.5% to ...
Tembotrione was introduced in 2007 for corn, and works against key grass species and importantly, kills broadleaf weeds, including glyphosate-, ALS- and dicamba-resistant weeds. Used with safeners there are no crop-rotation restrictions. Pyrasulfotole was also introduced in 2007 for cereals in North America, and was the first new class of ...
As with other glyphosate-resistant crops, GM sugar beet farming may contribute to the growing number of glyphosate-resistant weeds. GM Corn, GM soybeans and GM cotton are grown on many times the acreage devoted to sugar beets and these crops are most affected. [18]
The glyphosate-based herbicide RoundUp (styled: Roundup) was developed in the 1970s by Monsanto. Glyphosate was first registered for use in the U.S. in 1974. [4] Glyphosate-based herbicides were initially used in a similar way to paraquat and diquat, as non-selective herbicides. Attempts were made to apply them to row crops, but problems with ...
As of 2005, 87% of U.S. soybean fields were planted with glyphosate resistant varieties. [ 7 ] [ 8 ] While the use of Roundup Ready crops has increased the usage of herbicides measured in pounds applied per acre, [ 9 ] it has also changed the herbicide use profile away from atrazine , metribuzin , and alachlor [ citation needed ] which are more ...
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