New multiple‐herbicide crop resistance and formulation technology to augment the utility of glyphosate

Abstract

Glyphosate has performed long and well, but now some weed communities are shifting to populations that survive glyphosate, and growers need new weed management technologies to augment glyphosate performance in glyphosate-resistant crops. Unfortunately, most companies are not developing any new selective herbicides with new modes of action to fill this need. Fortunately, companies are developing new herbicide-resistant crop technologies to combine with glyphosate resistance and expand the utility of existing herbicides. One of the first multiple-herbicide-resistant crops will have a molecular stack of a new metabolically based glyphosate resistance mechanism with an active-site-based resistance to a broad spectrum of ALS-inhibiting herbicides. Additionally, new formulation technology called homogeneous blends will be used in conjunction with glyphosate and ALS-resistant crops. This formulation technology satisfies governmental regulations, so that new herbicide mixture offerings with diverse modes of action can be commercialized more rapidly and less expensively. Together, homogeneous blends and multiple-herbicide-resistant crops can offer growers a wider choice of herbicide mixtures at rates and ratios to augment glyphosate and satisfy changing weed management needs.

Challenges and Opportunities in Weed Management Under a Changing Agricultural Scenario

“…Introduction of glyphosate to the herbicide market in the year 1974, and subsequent development of glyphosate-resistant soybean and its commercialization in 1996, initiated a new era in modern weed science, similar to that of 2,4-D discovery [20]. This technology allowed the use of a non-selective herbicide within a row crop setting without injury to the resistant crop.…”

Herbicide Resistant Crops and Weeds: Implications for Herbicide Use and Weed Management

“…Glyphosate resistant (GR) crops have accounted for the vast majority of HR crop hectares in the United States. Glyphosate controls more than 300 weed species (Green et al 2008). Growers can control many broadleaf and grass weeds effectively using one herbicide instead of many different ones (Fernandez-Cornejo and McBride 2002).…”

Palmer Amaranth (<i>Amaranthus palmeri</i> S. Wats.) and Pitted Morningglory (<i>Ipomoea lacunosa</i> L.) Control in Dicamba Tolerant Soybean (<i>Glycine max</i> L.)

“…The extensive use of glyphosate in glyphosate-resistant soybean resulted in extremely high selection pressure, eventually leading to the selection of glyphosate-resistant biotypes [4]. Globally, there are currently 479 unique cases (species × site of action) of herbicide resistant weeds involving 251 species (146 dicots and 105 monocots) [5].…”