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Funded Project |
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Funding Program:
Integrated Pest Management Competitive Grants Program |
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Project Title:
Integrating Mechanical or Chemical Control with Biological Control for Improved Saltcedar Management at Southwestern Reservoirs |
Project Directors (PDs):
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Lead State: NM Lead Organization: New Mexico State University |
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Cooperating State(s):
Colorado |
| Undesignated Funding: $29,984 |
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Start Date: Mar-01-2016 End Date: Feb-28-2017 |
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Pests Involved: Saltcedar (tamarisk) |
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Summary:
Saltcedar (Tamarix spp.), a non-native shrub/small tree, has invaded riparian corridors throughout the southwestern U.S. It is especially problematic around reservoirs where it colonizes during periods of low water, and subsequently uses valuable water resources via evapotranspiration. Saltcedar has therefore been classified as a noxious weed in 14 states, and is the subject of constant management efforts.
Control measures for saltcedar typically include herbicide or mowing. Successful saltcedar removal operations require site restoration with native species. Such restoration is neither practical nor desirable around reservoirs where the primary goal is water storage, and the corresponding objective is to maintain saltcedar in a stressed condition and at a low stature. This would ensure that saltcedar has greatly decreased evapotranspiration or is inundated by water when the reservoir fills. However, such management is labor and energy intensive, necessitating a more sustainable technique. Integrated management using mowing or herbicide in combination with the biological control agent, the saltcedar leaf beetle (SCB), may provide an effective management approach. However, it is not known how this will impact saltcedar or how mowing and herbicide may affect SCB survival. To address these questions, we propose a Project Initiation to test the effects of mowing, herbicide, and a reduced herbicide rate, and their interactions with SCBs, on saltcedar. Response measures will be saltcedar photosynthetic and transpiration rates, canopy cover, and leaf litter nutrient analysis (a surrogate for plant stress). Additionally, we will test the effects of the treatments on SCB survival within the leaf litter below saltcedars. Objectives: Objective 1: Assess the integration of herbivory with mechanical or chemical management on saltcedar control. Objective 1.1. Evaluate the combination of herbivory and herbicide (full rate and reduced rate) on saltcedar control. Objective 1.2. Evaluate the combination of herbivory and mowing on saltcedar control. Objective 2: Evaluate the impacts of integrated management on SCB survival and emergence. Objective 2.1. Evaluate effects of herbicide treatments on SCB survival and emergence. Objective 2.2. Evaluate effects of mowing on SCB survival and emergence. |
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