Brush Control using Herbicides is Temporary

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Cut-stubble
Basal bark
Broadcast foliar
High volume
Low volume
Dormant stem
Cut stump
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Why doesnt ODOT have a major problem with brush
species along the highway ?
3
Because most roadsides get mowed from fence to
fence at least 1 time a year !
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ODOT Brush Problem Areas

• around creeks rivers
• around box-end culverts, wet or dry
• wet ditches
• steep slopes
• rocky or rough roadsides

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Liabilities of Brush Problems

• vehicle/tree collisions
• (clear zone)
• sight distance (curves, driveways,etc)
• clogged drainages (flooding)
• tree/limbs falling on road

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Brush Control Herbicides

• Tordon K, Tordon 101 Mixture - picloram
• Garlon 4 3A, Pathfinder II - triclopyr
• Roundup Pro, Accord, Rodeo - glyphosate
• Krenite S - fosamine ammonium
• Arsenal, Chopper - imazapyr

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Brush Control Herbicides

• Soil active/soil applied
• Tordon K, Tordon 101 Mixture, Arsenal, Chopper
  
  
• Foliar applied/no soil activity
• Garlon 4 3A, Pathfinder II, Accord
• Roundup Pro, Rodeo, Krenite S

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• At the rates used for brush control all
  treatments including the following will severely
  damage grass understories
  
• Roundup Pro, Accord, Rodeo, Arsenal, Chopper
• All other products will not injure grasses

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Tordon K Tordon 101 MRestricted Use Pesticide

• Considered to be toxic to plants at very low
  concentrations (drift)
  
• groundwater concerns (water or soil runoff)

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Brush control using herbicides gives only
temporary control!

• Retreatment Cycle
• 1 - 4 years

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Questions to Ask Yourself !

• Is my brush problem in or adjacent to standing or
  moving water ?
  
• Answer
• If yes, use Rodeo surfactant
• If no, use any of the others

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Questions to Ask Yourself !

• How thick is the brush ?
• Answer
• low, medium, or high density
• basal bark, broadcast foliar, cut-stubble, cut
  stump
  
• dormant stem techniques

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What is Brush Density?Stems / Acre

• Low Medium High
• 0 - 400 400 - 1000 1000
• 1 stem/ 1 stem/ 1 stem/
• 10 - 12 ft2 6 - 8 ft2 2 - 3
  ft2

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Why does brush density matter ?Has to do with
efficiency

• Low density - treat individual stems (spot
  treatment)
  
• Medium to High density - must be treated with a
  broadcast type application

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Questions to Ask Yourself !

• Can I make a boombuster application or will I
  need to use a handgun ?
  
• Depends on
• How close is the brush to the road?
• How close to water will you be spraying?
• How many miles do you have to spray?

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Questions to Ask Yourself !

• What is the average height of the brush ?
• Answer
• 15 ft. or more, removal followed by cut-stump
  trt.
  
• techniques

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Questions to Ask Yourself !

• Will the people in my county tolerate brush
  brownout?
  
• Answer
• Yes, then use foliar applications
• No, then use cut-stubble, cut stump
• dormant stem, or basal bark

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Cut-stubble Technique

• Brush is mowed treated as soon as possible
  (within a few days)
  
• use BoomBuster or Off-Center tips to make a
  uniform application to the soil
  
• used to reclaim heavily infested areas
• late spring or early summer is best time
• this technique/treatment will prevent resprouting
  by using soil active picloram

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Cut-stubble Technique

• roots collar of stubble will pick up the
  herbicide
  
• no brownout from this treatment
• do not use surfactants with this treatment
• use a minimum of 25 GPA carrier
• the following year use basal bark to spot
• do not make applications during drought

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Cut-stubble Treatment

• Herbicide Tordon K
• Rate 2 quarts prod./A
• Carrier Rate 50 GPA
• Timing of Application
• late spring through summer

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Cut-stubble Treatment

• Arsenal may be added to a cut-stubble treatment
  to pick up control of ash and hickory.
  
• Caution grass understories will be severely
  damaged
  

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Broadcast Foliar Technique(High Volume, 75 to
250 GPA)

• Used to reclaim medium to heavily infested areas
• early summer is best, but late will work
• late summer requires more surfactant
• use BoomBuster, Off-Center, or handgun
• do not make applications during drought
• brush should be thoroughly wetted

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Broadcast Foliar Technique(High Volume, 75 to
250 GPA)

• handgun application, Spray-to-Wet
• broadcast application, leaves should
• be wet but not dripping
• most brush species are susceptible
• do not spray any water
• this treatment causes severe brownout
• do not disturb treated area for 1 month

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Broadcast Foliar Treatment

• Herbicide Tordon K Garlon 4
• Rate 1 qts. 3 qts. prod./A
  (surfactant at 1 - 2 qts./100 gal.)
  
• Carrier Rate 75 GPA (boombuster)
• 150 GPA (handgun)
• Timing of Application
• late spring through summer

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Broadcast Foliar Treatment

• Herbicide Tordon 101 Mixture
• Rate 4 qts. prod./A
• (surfactant at 1 - 2 qts./100 gal.)
• Carrier Rate 75 GPA (boombuster)
• 150 GPA (handgun)
• Timing of Application
• late spring through summer

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Broadcast Foliar Treatment

• Arsenal may be added to a broadcast foliar
  treatment to pick up control of
  
• ash and hickory.
• Caution grass understories will be severely
  damaged
  

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What is Brush Density?Stems / Acre

• Low Medium High
• 0 - 400 400 - 1000 1000
• 1 stem/ 1 stem/ 1 stem/
• 10 - 12 ft2 6 - 8 ft2 2 - 3
  ft2