Invasive Plant Update
The Invasive Plant Management Plan Update will give Yosemite National Park resource managers greater flexibility in responding to present and future threats to park resources from non-native invasive species. No one method or herbicide is best for controlling all species in all situations, and new herbicides are continually being developed, tested, and approved for use. Adaptive management would allow the park to assess the safety and effectiveness of herbicides considered for protecting Yosemite’s biodiversity. It would provide a framework for decision making and prioritization strategies that based upon the time tested paradigms of Adaptive and Integrated Pest Management. As an example, two herbicides, glyphosate and aminopyralid are currently used in the park. Following the 2009 Big Meadow Fire in Yosemite, the Interagency Fire Management Team recommended applying a pre-emergent herbicide that to prevent cheatgrass from overtaking the meadow after the late-season fire. Since this specific chemical was not considered and evaluated in the 2008 IPMP, the park was unable to use this new tool. Successful aspects of the IPMP, such as annual work plans, prioritization, minimum tool analysis, and education, and outreach, would continue to be implemented.
Additional goals could include:
Did You Know?
In Yosemite Valley, dropping over 594-foot Nevada Fall and then 317-foot Vernal Fall, the Merced River creates what is known as the “Giant Staircase.” Such exemplary stair-step river morphology is characterized by a large variability in river movement and flow, from quiet pools to the dramatic drops of the waterfalls themselves.