HTIR-IPM for the West
A service of the Western Regional Work Group on Integrated Pest Management:
Consequences of Herbicide Tolerant and Insect Resistant Crops,
in cooperation with Colorado State University
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Herbicide-tolerant crops
Crop |
Total acreage, 2006 (1,000 acres) |
Estimated percent that is herbicide- tolerant |
Estimated acres that are herbicide- tolerant |
Alfalfa, new seeding |
711 |
na |
na |
Canola |
16 |
>90 |
>14.4 |
Corn |
2,399 |
61 |
1,463 |
Cotton |
890 |
53 |
472 |
Sorghum |
374 |
nc |
nc |
Sugar beet |
386 |
<1 |
<4 |
Sunflower |
140 |
15 |
21 |
Wheat |
13,581 |
4 |
543 |
Note . nc, not currently commercialized. |
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Acreage statistics for herbicide-tolerant crops in the West
Herbicide-tolerant crops in Western states |
||||||||
| Roundup Ready corn | ||||||||
| State | Thousands of acres | Percent of crop acres | Year | Source | ||||
| Arizona | 10 |
22 |
2003 | Clark | ||||
| California | 13 |
10 |
2003 | Canevari | ||||
| Colorado | 94 |
10 |
2003 | Westra | ||||
| Idaho | 14 |
27 |
2003 | Morishita | ||||
| Montana | ||||||||
| New Mexico | ||||||||
| Oregon | ||||||||
| Utah | 5 |
38 |
2003 | Evans | ||||
| Washington | ||||||||
| Wyoming | 7 |
15 |
2003 | Miller | ||||
| Roundup Ready cotton | ||||||||
| State | Thousands of acres | Percent of crop acres | Year | Source | ||||
| Arizona | 113 |
52 |
2003 | McCloskey | ||||
| California | 210 |
30 |
2003 | Vargas | ||||
| Colorado | ||||||||
| Idaho | ||||||||
| Montana | ||||||||
| New Mexico | 50 |
80 |
2003 | McWilliams | ||||
| Oregon | ||||||||
| Utah | ||||||||
| Washington | ||||||||
| Wyoming | ||||||||
| Bromoxynil-tolerant cotton | ||||||||
| State | Thousands of acres | Percent of crop acres | Year | Source | ||||
| Arizona | 4 |
2 |
2003 | McCloskey | ||||
| California | 42 |
6 |
2003 | Vargas | ||||
| Colorado | ||||||||
| Idaho | ||||||||
| Montana | ||||||||
| New Mexico | 0 |
0 |
2003 | McWilliams | ||||
| Oregon | ||||||||
| Utah | ||||||||
| Washington | ||||||||
| Wyoming | ||||||||
| Data extracted from "Impact on US Agriculture of Biotechnology-Derived Crops Planted in 2003 - An Update of Eleven Case Studies", October 2004, S. Sankula and E. Blumenthal, National Center for Food and Agricultural Policy, http://www.ncfap.org.whatwedo/pdf/2004finalreport.pdf. | ||||||||
According to Monsanto Company, the maker of Roundup, worldwide there are 12 weed species with biotypes confirmed to be resistant to glyphosate. Information on these is available from the International Survey of Herbicide Resistant Weeds at www.weedscience.com. Seven of these resistant biotypes are found in the United States. Some were found in areas where Roundup Ready crops are not grown.
Glyphosate-resistant weeds found in US in areas where Roundup Ready crops are grown:
- Palmer amaranth (Palmer pigweed)
Confirmed in Georgia in 2005
Suspected in Tennessee, North Carolina and Arkansas
- Common ragweed
Arkansas, Missouri
- Marestail (Horseweed)
AR, CA, DE, KY, IN, MD, MO, MS, NE, NC, NJ, OH, PA, TN
- Waterhemp
Missouri
- Giant ragweed
Indiana, Ohio
The other two weeds in the U.S. are:
- Italian Ryegrass
Oregon (orchard setting)
- Rigid Ryegrass
California (discovered in almonds)
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