integrated management strategies for perennial pepperweed · integrated management strategies for...
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![Page 1: Integrated Management Strategies for Perennial Pepperweed · Integrated Management Strategies for Perennial Pepperweed Rob Wilson, Joseph DiTomaso, Debra Boelk, and Guy Kyser University](https://reader031.vdocument.in/reader031/viewer/2022011814/5e4b42200762eb2cdb1e70a6/html5/thumbnails/1.jpg)
Integrated Management Integrated Management Strategies for Perennial Strategies for Perennial
PepperweedPepperweedRob Wilson, Joseph DiTomaso, Rob Wilson, Joseph DiTomaso,
Debra Boelk, and Guy KyserDebra Boelk, and Guy KyserUniversity of California Cooperative ExtensionUniversity of California Cooperative Extension
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BackgroundBackground• Perennial pepperweed is
becoming the #1 weed problem in much of Northeast California and Western Nevada
• Rapidly invades floodplains, wetlands, roadsides, and rangeland (especially following disturbance)
• Many infestations have formed large monoculture stands covering several acres
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Management ObstaclesManagement Obstacles
• Impenetrable thatch layer of senesced shoots
• Extensive creeping root system
• Sodic soils with less than 8 to 10 inches of yearly precipitation
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How productive How productive is this site?is this site?
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Management Questions?Management Questions?• Combining burning, mowing, grazing, or
tillage with herbicides and re-seeding– Can burning, mowing, grazing, or tillage
effectively remove thatch and stimulate vegetation recovery?
– Does burning, mowing, grazing, or tillage before treatment affect herbicide efficacy?
– How does integrating control methods influence re-seeding success and long-term weed suppression?
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Experiment Design Experiment Design • Established at two sites in Lassen County in Fall
2002• Both sites were monoculture stands of perennial
pepperweed• Split-split-plot design with 4 replications
– 4 site preparation treatments • burning, tillage, grazing, mowing, control
– 3 herbicide treatments• chlorsulfuron, glyphosate, 2,4-D, control
– 1 re-vegetation treatment• Seed native perennial grass mix , control
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Experiment DesignExperiment DesignBurnBurn
glyphosateglyphosateseedseed
glyphosateglyphosatenono--seedseed
2,42,4--DDseedseed
2,42,4--DDnono--seedseed
untreateduntreatednono--seedseed
chlorsulfuronchlorsulfuronnono--seedseed
untreateduntreatedseedseed
chlorsulfuronchlorsulfuronseedseed
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Winter BurningWinter Burning
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Fall DiskingFall Disking
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Winter GrazingWinter Grazing
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Spring Mowing at FloweringSpring Mowing at Flowering(fall re(fall re--growth)growth)
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Untreated Untreated (herbicides alone)(herbicides alone)
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11stst Year TreatmentsYear TreatmentsMowMow BurnBurn DiskDisk GrazeGraze UntreatedUntreated
1.5 oz ai/A 1.5 oz ai/A flowerbudflowerbud
3 lb ae/A 3 lb ae/A flowerbudflowerbud
2 lb ae/A2 lb ae/Aflowerbudflowerbud
no no herbicideherbicide
chlorsulfuronchlorsulfuron+ NIS+ NIS(Telar)(Telar)
1.5 oz ai/A1.5 oz ai/Afall fall regrowthregrowth
1.5 oz ai/A 1.5 oz ai/A flowerbudflowerbud
1.5 oz ai/A 1.5 oz ai/A flowerbudflowerbud
1.5 oz ai/A 1.5 oz ai/A flowerbudflowerbud
3 lb ae/A 3 lb ae/A flowerbud flowerbud
3 lb ae/A 3 lb ae/A flowerbud flowerbud
2 lb ae/A 2 lb ae/A flowerbud flowerbud
no no herbicideherbicide
2 lb ae/A 2 lb ae/A flowerbud flowerbud
no no herbicideherbicide
3 lb ae/A3 lb ae/Afall fall regrowthregrowth
2 lb ae/A2 lb ae/Afall fall regrowthregrowth
glyphosateglyphosate+ NIS + AMS+ NIS + AMS(Roundup)(Roundup)
no no herbicideherbicide
3 lb ae/A 3 lb ae/A flowerbudflowerbud
2 lb ae/A 2 lb ae/A flowerbudflowerbud
no no herbicideherbicide
2,42,4--D ester + D ester + NISNIS(Weedone (Weedone LV4)LV4)controlcontrol
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22ndnd Year TreatmentsYear TreatmentsMow Mow fall mow fall mow drilled seed drilled seed in Marchin Marchspring mowspring mow
BurnBurnfall mowfall mowdrilled seed drilled seed in Marchin March
DiskDiskfall disk fall disk drilled seed drilled seed in Marchin March
GrazeGrazewinter grazewinter grazebroadcast broadcast seed before seed before grazinggrazing
UntreatedUntreated
broadcast broadcast seed in seed in MarchMarch
0.75 oz/A 0.75 oz/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
no no herbicideherbicide
controlcontrol no no herbicideherbicide
no no herbicideherbicide
no no herbicideherbicide
no no herbicideherbicide
chlorchlor--sulfuronsulfuron
0.75 oz/A0.75 oz/Afall fall regrowthregrowth
0.75 oz/A 0.75 oz/A flowerbudflowerbud
0.75 oz/A 0.75 oz/A flowerbudflowerbud
0.75 oz/A 0.75 oz/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A fall fall regrowth regrowth
glyphosate glyphosate 2,42,4--D 2D 2ndnd yryr
1 lb/A 1 lb/A fall fall regrowthregrowth
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
2,42,4--DD
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3rd Year Treatments3rd Year TreatmentsMow Mow fall mow fall mow drilled seed drilled seed in Marchin Marchspring mowspring mow
BurnBurnfall mowfall mowdrilled seed drilled seed in Marchin March
DiskDiskfall disk fall disk drilled seed drilled seed in Marchin March
GrazeGrazewinter grazewinter grazebroadcast broadcast seed before seed before grazinggrazing
UntreatedUntreated
broadcast broadcast seed in seed in MarchMarch
no no herbicideherbicide
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
no no herbicideherbicide
controlcontrol no no herbicideherbicide
no no herbicideherbicide
no no herbicideherbicide
no no herbicideherbicide
chlorchlor--sulfuronsulfuron
no no herbicideherbicide
no no herbicideherbicide
no no herbicideherbicide
no no herbicideherbicide
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A fall fall regrowthregrowth
glyphosate glyphosate 2,42,4--D 2D 2ndnd yryr2,42,4--D 3D 3rdrd yryr
1 lb/A 1 lb/A fall fall regrowthregrowth
1 lb/A 1 lb/A flowerbudflowerbud
1 lb/A 1 lb/A flowerbudflowerbud
2,42,4--DD
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Native Perennial Grass MixNative Perennial Grass Mix
• ‘Rosana’ western wheatgrass (6 lb/A PLS)
• ‘Shoshone’ beardless wildrye (9 lb/A PLS)
• ‘Magnar’ basin wildrye (4 lb/A PLS)
• ‘Revenue’ slender wheatgrass (2 lb/A PLS)
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ResultsResults
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The Effect of Control Methods on Perennial Pepperweed Cover June 2006 (4 years after treatment initiation)
0 10 20 30 40 50 60 70 80 90 100
Untreated
Burn
Mowing
Grazing
Tillage
Telar
Burn + Telar
Mowing + Fall Telar
Grazing + Telar
Tillage + Telar
2,4-D
Burn + 2,4-D
Mowing + Fall 2,4-D
Grazing + 2,4-D
Tillage + 2,4-D
Roundup or 2,4-D
Burn + Roundup or 2,4-D
Mowing + Fall Roundup or 2,4-D
Grazing + Roundup or 2,4-D
Tillage + Roundup or 2,4-D
% perennial pepperweed cover
Mapes RanchHoneylake Wildlife Area
Error bars= 95 % confidence interval
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BurnBurn DiskDisk
MowMow GrazeGraze
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No Way!!No Way!!
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The Influence of Site Preparation Treatments and Herbicides on Perennial Grass Establishment in June 2006 (15 months after 2nd seeding)
0 10 20 30 40 50 60 70 80 90 100
Untreated
Burn
Mowing
Grazing
Tillage
Telar
Burn + Telar
Mowing + Fall Telar
Grazing + Telar
Tillage + Telar
2,4-D
Burn + 2,4-D
Mowing + Fall 2,4-D
Grazing + 2,4-D
Tillage + 2,4-D
Roundup or 2,4-D
Burn + Roundup or 2,4-D
Mowing + Fall Roundup or 2,4-D
Grazing + Roundup or 2,4-D
Tillage + Roundup or 2,4-D
% Perennial Grass Cover
Mapes Ranch
Honeylake Wildlife Area
Error bars = 95 % confidence interval
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Chlorsulfuron Injury to Grass SeedlingsChlorsulfuron Injury to Grass Seedlings
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No Site Preparation or ReseedingNo Site Preparation or Reseeding(3 years after treatment initiation)(3 years after treatment initiation)
untreateduntreated chlorsulfuronchlorsulfuron
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Burn without ReseedingBurn without Reseeding(3 years after treatment initiation)(3 years after treatment initiation)
untreateduntreatedchlorsulfuronchlorsulfuron
2,42,4--DD
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Mow + Glyphosate & 2,4Mow + Glyphosate & 2,4--D + ReseedingD + Reseeding(3 years after treatment initiation)(3 years after treatment initiation)
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Disk + Glyphosate & 2,4Disk + Glyphosate & 2,4--D + ReseedingD + Reseeding(3 years after treatment initiation)(3 years after treatment initiation)
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Burn + 2,4Burn + 2,4--D + ReseedingD + Reseeding(3 years after treatment initiation)(3 years after treatment initiation)
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Burn + 2,4Burn + 2,4--D + ReseedingD + Reseeding(4 years after treatment initiation)(4 years after treatment initiation)
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Disk + Glyphosate & 2,4Disk + Glyphosate & 2,4--D + ReseedingD + Reseeding(4 years after treatment initiation)(4 years after treatment initiation)
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SummarySummary• Burning or mowing + yearly herbicide applications
provided the best combination of perennial pepperweed control and grass establishment
• Thatch removal, reseeding, and herbicide treatment before and after grass establishment were necessary for site restoration
• Maintenance herbicide treatments and multiple re-seedings need to be factored into management plans
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Special ThanksSpecial Thanks
• UC Integrated Pest Management Program
• California Department of Fish and Game
• Five Dot Land and Cattle
• Willis Dow