The herbicide glyphosate, commonly sold under the brand name Roundup, is steadily becoming less effective as weeds develop resistance to it.
Glyphosate was first registered in 1974, but it was the introduction of “Roundup Ready” crops genetically modified to resist the herbicide in 1996 that really led to an explosion in its use, particularly in North America – the US and Canada alone apply more than 130 million kg each year. Read more in CIC News.