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Funded Project |
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Funding Program:
IPM Enhancement Grants |
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Project Title:
Extent of Multiple Herbicide-Resistant Weeds and Predicting Risk of Further Herbicide Resistance in Georgia |
Project Directors (PDs):
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Lead State: GA Lead Organization: University of Georgia Research Foundation |
| Undesignated Funding: $23,005 |
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Start Date: May-01-2013 End Date: Apr-30-2014 |
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Pests Involved: weeds |
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Site/Commodity: Georgia, agronomic |
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Area of Emphasis: herbicide resistance |
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Summary:
The widespread use of herbicides such as glyphosate has resulted in the development of herbicide-resistant weeds. GR Palmer amaranth is the most significant species of concern in cotton production; more than 2 million ha of agricultural land in the Midsouth and SE US are estimated to be infested. However, with the imminent introduction of other herbicide-resistant crops such as auxinic-resistant cotton and soybean, weed scientists need to better be able to predict herbicide-resistant weeds. To preserve other herbicide mechanisms of action, we need to know more about the potential for other cases of glyphosate as well as other herbicide resistance and multiple-resistant weed populations. The immediate goal of this project is to 1) conduct a survey in 20 fields geographically dispersed in Georgia and collect mature weed seeds from as many species as possible and determine sensitivity to seven herbicide mechanisms of action (EPSP (WSSA Group 9), GS (WSSA Group 10), PSII (WSSA Group 5), PPO (WSSA Group 14), ALS (WSSA Group 2), HPPD (WSSA Group 27), and Auxinic (WSSA Group 4)) and if any multiple herbicide resistance is present and 2) determine a risk of major agronomic weeds in Georgia to further herbicide resistance development.
Objectives: Objectives: " Survey weed populations in 20 fields in five geographic regions of Georgia and determine resistance to six herbicide mechanisms of action " Determine potential risk of most common weed species in Georgia agricultural production to develop herbicide resistance |
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Final Report: |
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Non-technical summary and Results A total of 30 fields from across Georgia were sampled near harvest time in 2013 for any weeds that were present. Collected weed seed were grown in the greenhouse and examined for potential resistance to six herbicide mechanisms of action (Group 2,4,5,9,10,14). Eighty-six percent of the weeds identified and seed collected were from Palmer amaranth. Sixty-nine percent of the fields containing Palmer amaranth were glyphosate-resistant demonstrating the widespread nature of glyphosate resistance in Palmer amaranth. A population of Palmer amaranth was found to be atrazine resistant. Sicklepod, coffee senna, and Texas miller were common as well. One population of sicklepod was found to be resistant to atrazine. This is the first case of herbicide-resistant sicklepod to be reported in the US. As a result of this survey, we will do further surveys for atrazine-resistant sicklepod in south Georgia in 2014. |
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Target audience The target audience of this work was extension specialist and county agents. The goal is to conduct surveys of weeds to catch any new cases of herbicide resistant weeds before they spread and become more problematic to manage, |
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Activities / Events Results of this work have been shared with extension specialists and county agents and publicized in blogs and online publications such as the Southeast Farm Press. Total results will be reported at the Southern Weed Science meeting in 2015. |
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Outcomes As a result of this work, the first case of herbicide resistance in sicklepod has been discovered and atrazine resistance has been discovered in Palmer amaranth in a situation where crops are rotated. In addition, we will be working with local extension personnel this year to screen for other cases of herbicide-resistance in these weeds. |
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Impacts These results have been shared with extension personnel in the state so that they and growers can be on the lookout for other cases of atrazine resistance in these weeds and have been shared through popular media (Prostko, E.P. 2014. Palmer amaranth resistant to atrazine confirmed in Georgia. Southeast Farm Press, Jan. 29, 2014). |
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Publications None yet. |
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Other Products / Outputs None yet. |
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Leveraged Funds None yet but we anticipate using this approach to submit grant proposals to other agencies to continue a sampling program. |
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