1a. Objectives (from AD-416)
To develop and implement a comprehensive, regional Ecologically-Based Invasive Plant Management (EBIPM) program to restore ecosystems threatened and dominated by cheatgrass/medusahead in Rock Creek watershed and the Great Basin.
1b. Approach (from AD-416)
University of Nevada, Reno (UN-Reno) and USDA, Agricultural Research Service (ARS) scientists will cooperate on a project to (1) demonstrate and assess, on a large-scale, the effectiveness of reduced rates of glyphosate for control of downy brome, and to determine its utility in stimulating a trajectory toward desired species, and (2) determine the influence of (a) site, (b) reduction of herbaceous competition, (c) season of planting and (d) plant source (nursery stock vs. indigenous) on survival of sagebrush transplants (refer to project proposal for more detailed information). Documents SCA with UN-Reno.
3. Progress Report
The goal of this project is to develop and implement a comprehensive, regional EBIPM program to restore ecosystems threatened and dominated by cheatgrass/ medusahead in Rock Creek watershed in the Great Basin which contributes directly to Subobjectives 1.1 and 1.2 of the Area-wide pest management project for annual grasses in the Great Basin. Study sites were established at each of 3 locations: (1) a cheatgrass monoculture, (2) a monoculture of crested wheatgrass seeding, and (3) a native post-fire grass-forb community. At each site, treatments were arranged in a randomized block design with 5 replications. Each block included 8, 5 x 5m plots representing factorial combinations of herbicide treatment (glyphosate), no herbicide treatment, season of planting (fall or spring), and plant source (wild, or wildling transplant or nursery stock), with 10 sagebrush planted in each plot. Interim (2009) results for the spring-planted trials showed that significantly more (p<0.05) nursery stock survived than wildling transplants in each of the 3 plant communities where herbaceous cover was reduced with herbicide. In all plant communities combined, mean survival rate of nursery stock was 54.7%, compared with 16.7% for the wildling transplants. Surviving wildlings and nursery stock were significantly (p<0.05) taller and hence more vigorous within each plant community in plots where herbaceous cover had been reduced with herbicide. The treatments detailed above were repeated during spring of 2010. Data collection is in progress. ADODR monitoring progress through meetings and telephone conference calls and multiple site visits.