Does Herbicide Use Encourage “Superweeds”?

When Roundup® entered the market in the early 1970s, it seemed to be an herbicide dream come true. Inexpensive, effective and non-persistent in the environment, glyphosate, the main ingredient in Roundup®, gave most users few things to complain about. Roundup® was cheaper than many other herbicides, so farmers could use it throughout the growing season with little economic impact. Farmers also enjoyed weed-free fields, and with the introduction of Roundup Ready crops in the 1990s, spraying weeds in developing fields became easier. National Park Service staff even use glyphosate to kill invasive weeds in the forest because it effectively controls vegetation and has low mammalian toxicity.

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