Exotic Plant Program: Crater Lake National Park
Coleman W. 2005. Exotic Plant Program: Crater Lake National Park. Crater Lake National Park, OR
Exotic plant control by means of hand-pulling unwanted invasive species was the focus of the exotic plant program at Crater Lake National Park in 2005. In general, areas that were treated with hand-pulling in 2004, were revisited with further manual control actions being subsequently performed again in 2005. Overall, little change was seen between 2004 and 2005 in the known exotic plant populations in relation to abundance or size of area infested. In most cases, exotic plant occurrences were located in the same places where they have been documented indicating that there is either viable seed remaining in the seed bed of these removed populations or in some instances, asexual propagation has prolonged the presence of these populations. For the purpose of cohesion in definition, we should consider these populations contained but not yet controlled. Some new occurrences were discovered in 2005 which had been overlooked in previous years because we had focused on developed areas during surveys. For example, approximately ½ acre of Cirsium vulgare (Bull thistle) was found in PH2; in the southern extension of Crater Lake National Park known as the panhandle.
- Type
- Unpublished Report
- Authors
- Coleman, Wendy
- Date of Issue
- 2005-10-17
- Units
- CRLA
- Keywords
- Absence (Biodiversity), Abundance (Biodiversity), Alien Species, Distribution (Biodiversity), Exotic Species, Integrated Pest Management (IPM), Invasive Plants, Non-Native Species, Observations, Presence (Biodiversity), Resource Management, Vegetation