Prineville District
Vegetation Treatments Using Herbicides on
BLM Lands in Oregon
Environmental Impact Statement
Prineville District - Common Weed
Species
Dalmatian
toadflax
Medusahead rye
Whitetop
Russian knapweed
Diffuse knapweed
Yellow starthistle
Canada thistle
Puncture vine
Leafy spurge
Example of Weed Treatment Map
Integrated Vegetation Management
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Provide public information on washing vehicles
to avoid transporting undesirable plant seeds
onto public lands; sign boards; handouts at
recreation sites
Coordinate with 8 county weed boards and
provide funding to 5 counties for weed control
on BLM lands
Using biological control agents in coordination
with Oregon Dept of Agriculture
Integrated Vegetation Management
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Use a variety of approved chemicals for targeted
species
Treatment priorities include high use recreation
areas; acquired lands (abandoned agricultural
fields); areas with high concentrations of
noxious weeds; riparian areas; areas of whitetop
Before treatments occur we contact adjacent
landowners and neighbors. Many treatments are
a result of landowners calling us
Manual & Mechanical Treatments
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Approximately 550 acres treated annually
1350 acres are monitored for treatment
effectiveness
Treatments are generally limited to areas with good
access – high use recreation areas and along roads
 Treatments in the river canyons are desirable but
difficult and costly due to limited access
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Biological Agents
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Establishment of food and
cover crops to out compete
weeds
Introduction of toadflax
capsule weevil to control
Dalmatian toadflax in the
John Day River corridor
Herbicide Treatments
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Acquired lands (abandoned agricultural fields)
use chemicals for treating knapweeds and
broadleaf weeds (county and BLM)
Pesticide Use Permit Application
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Location of the area to be treated
Chemical to be applied, application rate and
method of application
Target species
Description of treatment site
Sensitive aspects and precautions/mitigations
Impacts to non-target species
How Vegetation Treatment EIS
Would Help
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Target-specific herbicides are more effective at
treating the problem
Safer to use in sensitive riparian habitats
Reduced residual off-site effects
More cost effective
District Level Analysis
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Once the statewide Vegetation Treatment EIS is
finalized, additional National Environmental
Policy Act analysis would be required at the
District or Resource Area level.