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Monsanto developed and patented the use of glyphosate to kill weeds in the early 1970s and first brought it to market in 1974 under the Roundup brandname. [27] [28] While its initial patent [29] expired in 1991, Monsanto retained exclusive rights in the United States until its patent [30] on the isopropylamine salt expired in September 2000. [31]
Glyphosate-based herbicides are herbicides made of a glyphosate salt usually combined with other ingredients needed to stabilize the formula and allow penetration into plants. Roundup was the first glyphosate-based herbicide, developed by Monsanto in the 1970s.
Dicamba and 2,4-D will cause harm to most broad-leaved plants, so the user should take care to avoid over-application. They can be applied to lawns without injuring the desired grass. Glyphosate will kill or injure most plants, so it should only be used as a spot treatment or on solid stands of the weed.
Plants developed resistance to atrazine and to ALS-inhibitors relatively early, but more recently, glyphosate resistance has dramatically risen. Marestail is one weed that has developed glyphosate resistance. [69] Glyphosate-resistant weeds are present in the vast majority of soybean, cotton and corn farms in some U.S. states.
Herbicides are often used in these cleaning operations because the correct chemical at the correct dose (e.g. glyphosate or triclopyr) and time will kill only broad leaved species, leaving the conifers unharmed and free to grow. Chemical treatments may be applied by foliage sprays, mists or pellets.
Johnson grass that is resistant to the common herbicide glyphosate has been found in Argentina and the United States. [2] [3] [4] It is considered to be one of the ten worst weeds in the world. [5] In the United States, Johnson grass is listed as either a noxious or quarantined weed in 19 states. [6]
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