![]() Roundup, Ultra, Rodeo, TouchDown Pro, AccordĪpplied primarily to genetically engineered, glyphosate-resistant varieties of soybeans, corn, canola and cotton. Common Applications and Modes of Action of the Ten Most Heavily Used Herbicides in the United States, 2001 Herbicide Glyphosate and atrazine were applied to more than double the crop field acreage than the third leading herbicide, 2,4-D, in 2001. Application methods include spraying onto foliage, applying to soils and applying directly to aquatic systems.įigure 1 and Table 1 present the ten herbicides most used on agricultural land in the U.S. Herbicides can act by inhibiting cell division, photosynthesis or amino acid production or by mimicking natural plant growth hormones, causing deformities (Ross and Childs 1996). ![]() The molecular site of action is challenging to predict because structural associations have not been identified (Duke 1990), but modes of action are well-established. The potential effects of herbicides are strongly influenced by their toxic mode of action and their method of application. These weeds can impede irrigation withdrawals or interfere with recreational and industrial uses of water (Folmar et al. Herbicides are applied to water bodies to control aquatic weeds. In suburban and urban areas, herbicides are applied to lawns, parks, golf courses and other areas. The total applied volume and area covered is greater but the frequency of application is much less than for farming (Shepard et al. Herbicides are used in forest management to prepare logged areas for replanting. ![]() Reproduced from USDA Economic Research Service, Pest Management ![]() Agricultural use of herbicides in 2001 in millions of acres. ![]()
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