authors - kim goodwin, project specialist roger sheley, associate professor
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Rangeland Weed Management. Authors - Kim Goodwin, Project Specialist Roger Sheley, Associate Professor Janet Clark, Director, Center for Invasive Plant Management Department Editor - James E. Knight, Extension Agriculture and Natural Resources Program Montana State University. Part 2. - PowerPoint PPT PresentationTRANSCRIPT
Authors - Kim Goodwin, Project Specialist Roger Sheley, Associate Professor Janet Clark, Director, Center for Invasive Plant Management DepartmentEditor - James E. Knight, Extension Agriculture and Natural Resources Program Montana State University
Rangeland Weed Management
Part 2
This is the second half of the weeds PowerPoint presentation
Integrated Weed Management
Develop & maintain healthy, desired plant communities
Variety of preventive strategies
Large versus small weed infestations
Prevention & early detection
Prevention – most effective, least costly Limit weed dispersal Detect and eradicate
early Re-vegetate when
necessary Properly manage
desired plants
Limiting dispersal of weed seeds
Certified weed-free gravel, seed mixes, forage, and mulch
Clean undercarriage of vehicles Boots and clothing Livestock movement Detect early – pull, clip, bag,
burn Eradicate
Detecting & Eradicating Weed Introductions Early on Monitoring is crucial Develop a Monitoring
plan Spring Summer Early Fall
Eradicating small seed patches
Newly established Small than 100 square feet
Prioritize: low-density responds more quickly Document changes in patch size & density Flag or mark
Frequent follow-up
Managing Large Infestations
Limit seed dispersal Requires use of many
management methods Mechanical Chemical Cultural, and Biological
Large Infestations, cont.
Mowing effectiveness based upon:Time of growing seasonBiological characteristics of the target weed
Large Infestations, cont.
Chemical control - herbicidesEradicateReduce weed vigor
Long-term control – when healthy plant community is present
Selecting the right herbicide The target weed Weed density Herbicide toxicity Herbicide degradation time Desired vegetation cover Soil attributes Proximity to water, and Environmental conditions.
Time herbicide application
Nonresidual herbicides: During seeding/rosette, Early bud, and Fall regrowth
Soil-residual herbicides: Timing is less important
Suggested Placement
Depends upon the size of the infestationModerate size – wide treatmentLarge size – perimeter treatment
Cultural Control
Promote growth & competitiveness of desired plants Re-vegetation Management of desired
plants Grazing Management
“Single-entry” Revegetation
One late-fall field entryCost-effectiveYields reliable revegetation
Cultural Control
Grazing Domestic sheep Early bud stage of the weed
Weaken the weeds Over time – effects underground reserves
Eventually reducing stem densities
Biological Control
Insect biocontrols Remove viable fluids Defoliate Eat seeds Bore into roots, shoots, and stems
Effective when integrated with other management strategies
Monitoring & evaluation
Periodic observation is necessary Does not need to be elaborate
Photo monitoring
Integrated Weed Management Plan
Following a burn – weeds are likely Is revegetation necessary?
Fall-dormant broadcast reseeding effort