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Funded Project |
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Funding Program:
Integrated Pest Management Competitive Grants Program |
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Project Title:
Integrated pest management strategies for Phragmites-invaded wetlands in the Western United States |
Project Director (PD):
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Lead State: UT Lead Organization: Utah State University |
| Undesignated Funding: $30,000 |
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Start Date: Mar-01-2019 End Date: Feb-29-2020 |
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Summary:
One of the biggest threats to wetlands in the Western U.S. is the invasive grass Phragmites australis. This plant—which is a noxious weed in many Western states and is on the Western Governors’ Association invasive species list—is extremely tall, dense, and aggressive and has taken over vast areas of wetlands in the West. Herbicide (glyphosate applied late summer) is effective at killing Phragmites but as our research has shown, native plants slowly or never return following Phragmites control. Active revegetation is necessary for more effective IPM, specifically to reduce recurring herbicide application and to recover lost habitat. The broad goal of this research is to restore native plant-dominated wetlands in the Western U.S. following invasive Phragmites control. Our objectives are to (1) determine the most effective seeding techniques to maximize seedling survival by (1a) identifying optimal densities and seed mix composition, (1b) determining limiting abiotic conditions, and (1c) developing interventions to overcome limiting conditions; (2) develop a systems model that predicts seedling survival across a range of abiotic conditions, which can be adapted for other wetland systems in the West; and (3) develop extension materials to disseminate research findings and the model. Thus, we will initiate the first large-scale assessment of seed-based wetland restoration approaches following Phragmites control. Field data will be used to validate and refine the systems model to predict seeding success across environmental gradients. We are committed to disseminating research results broadly throughout the West, as we have done effectively with our prior management-research efforts.
Objectives: Objective 1: Determine the most effective seeding techniques to maximize seedling survival for native plant restoration following invasive Phragmites control 1a. Determine the relative effectiveness of different seeding densities and species mix compositions 1b. Determine how abiotic conditions affect the performance of native plant seeds and seedlings to identify the limiting plant life stages that may reduce revegetation success 1c. Identify restoration interventions that can be made to overcome limiting life stages Objective 2: Develop a preliminary systems model that predicts native seedling survival across a range of abiotic conditions, which can be adapted for other wetland systems in the Western U.S. Objective 3: Develop extension publications and presentations to disseminate research findings and the predictive systems model |
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