Invasive Plants in Oregon

The past few weeks I have been working on mapping invasive species locations in different parts of the BLM Roseburg district. I mostly mapped invasive species infestations along a timber haul route. The goal of this project was to map invasive species locations so that they can be treated before timber harvesting starts. The intention is to reduce the spreading of invasive plants. Pictured below I am mapping a location of Himalayan Blackberry which is a common invasive species found along roadsides and riparian areas. If left untreated, this plant could eventually become a huge thicket and take over the under story. It could then out compete native species and prevent the establishment of newer trees.

Pictured below is an infestation of Scotch Broom. Scotch Broom is an invasive species that is difficult to manage because it responds well to disturbances and the seed bank can last up to 50 years. It can also cause damages to the timber industry through out competing seedling trees.

Another invasive species I have encountered in the field is Canada Thistle which is pictured below. Canada Thistle is another invasive species in Oregon that is difficult to manage. Pulling up one plant will not kill it since multiple plants share an underground root system and all the plants are interconnected.

In all it seems that invasive species in Oregon are very hard to control. I will be getting my Oregon Pesticide Applicator License soon, so I will be able to better help in the fight against these resilient plants in Oregon.

Will Farhat – CLM Intern with the Bureau of Land Management Roseburg District

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