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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 of barb goatgrass and medusahead in annual grasslands |
Project Directors (PDs):
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Lead State: CA Lead Organization: University of California, Davis |
| Undesignated Funding: $30,000 |
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Start Date: Mar-01-2016 End Date: Feb-28-2017 |
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Pests Involved: Barb Goatgrass and Medusahead |
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Site/Commodity: Rangelands/livestock |
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Area of Emphasis: Annual grasslands |
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Summary:
Long-term control of economically and ecologically damaging invasive plants has generally proved unsuccessful in the western U.S.; although integrated pest management (IPM) - which uses a combination of mutually supportive treatments, such as targeted grazing and herbicide - has shown promise. However, the success of IPM approaches for managing particularly noxious invasive annual grasses, are limited. For example, current IPM approaches often do not accommodate for phenology, despite research that demonstrates the important role of demographic timing for management outcomes. Moreover, IPM often does not address more progressive management techniques, including seeding of desired species. Reseeding is a promising IPM component because it creates a barrier to weed establishment; is compatible with forage production; and may increase community resistance to future invasion.
We propose to refine the current palette of IPM strategies through considerations of phenology and incorporation of reseeding to control the Eurasian winter annual grasses barb goatgrass (Aegilops triuncialis) and medusahead (Taeniatherum caput-medusae), which are expanding their range in the western U.S. We will initiate a complete block, crossed experiment in infested areas in Hopland, CA. Treatments include: herbicide (untreated, low rate glyphosate, high rate glyphosate); phenology (tillering, boot, heading); grazing (absent and present); and (d) seeding (none, forage species, native species). We will evaluate single and interacting treatment efficiency with cover and biomass surveys. This data will further be used to refine treatments and modify design for a multi-year study which will ultimately highlight cost-effective strategies for long-term control of both weedy species. Objectives: (1) Refine methods of application of two conventional means of controlling invasive grasses, i.e., targeted grazing and late-season herbicide treatment, and assess their impact on population densities of barb goatgrass and medusahead. (2) Understand if and how phenology plays a role in modifying invasive grass response to management strategies. (3) Incorporate reseeding into conventional IPM strategies and evaluate all treatment combinations for efficacy, practicability, and economic feasibility. Evaluate the long-term effects of establishing two different seeding mixes a native seed mix and an annual grass forage mix in suppressing reinvasion of barb goatgrass and medusahead, and determine which species mix has the greatest degree of functional similarity / niche overlap with the invasives. Eventually determine which combination of strategies is most effective in supporting establishment of desired species. |
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