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Funded Project |
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Funding Program:
IPM Enhancement Grants |
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Project Title:
Investigating Metolachlor Resistance in Palmer Amaranth |
Project Director (PD):
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Lead State: AR Lead Organization: University of Arkansas |
| Undesignated Funding: $29,999 |
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Start Date: Mar-01-2018 End Date: Feb-28-2019 |
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Pests Involved: weed - Palmer amaranth |
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Site/Commodity: corn, cotton, soybean, specialty crops |
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Area of Emphasis: herbicide resistant Palmer amaranth |
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Summary:
Palmer amaranth (Amaranthus palmeri S. Watson) is a common weed in the southern United States and can reduce the yield of corn, cotton, and soybean. Regional stakeholders have identified herbicide resistance in Palmer amaranth as a top priority. Among the few herbicide options remaining for Palmer amaranth control are very long chain fatty acid synthesis inhibitors, such as metolachlor. Exploratory data sets have indicated that Palmer amaranth populations may have developed resistance to metolachlor. Data are needed to assess frequency of metolachlor resistance occurrence in Palmer amaranth as well as the contributing factors such as accelerated soil dissipation. Microbially-accelerated herbicide dissipation in soil results in shortened residual herbicide activity, exposing a large proportion of germinating seeds to progressively lower doses of metolachlor. This promotes low-dose selection for tolerant plants, and, ultimately, the evolution of a resistant population. Given the long-term use of metolachlor for control of herbicide resistant Palmer amaranth, it is likely that soil microbial communities have adapted to rapidly degrade metolachlor. Palmer amaranth resistance effects states throughout the Southern region. The preliminary findings generated by this proposal will be relevant to the entire Southern region, and will inform management decisions to prevent and manage herbicide resistant Palmer amaranth.
Objectives: 1. Screen Palmer amaranth populations for metolachlor resistance using bioassays 2. Screen agricultural soils for accelerated metolachlor soil dissipation rates 3. Share data via presentations, publications, and international survey online database |
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Final Report: |
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Outputs -Completed or initiated 4 experiments -Presented research at 3 conferences -Published 1 presentation abstract, 1 Fact Sheet, and 1 Research Series paper -Made 1 database entry based on research findings -Secured additional ~$136k in funding |
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Outcomes |
| Report Appendices |
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