Forestry Herbicides 101
Transcript of Forestry Herbicides 101
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Matt KrausharHabitat Restoration and Ecology Purdue University West Lafayette, IndianaDepartment of Forestry and Natural
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Topics
Integrated Vegetation Management Techniques
More than one way to apply herbicide!Site Prep- plantations and under planting
Resistance Invasive and Exotic Species
ID and Control
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“Many Hammers” – Liebman & Gallandt 1997.
The most successful habitat and vegetation management plans require adaptive strategies:
Integrated Vegetation Management (IVM)
IVM
DesiredVegetation
AvailableMethods
Long-termmaintenance
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Vegetation Management Options
Chemical - use of any herbicide/pesticide
Mechanical - physical attack on the plant
Natural - competition*, drought, fire, etc.
Biological - purposeful release of a predatory organism
IVM- combinations of the above
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Biological Control
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Mechanical
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Herbicide as a tool
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Year-round/Dormant Season Method(e.g. thinning and TSI)
Dormant season methods help to reduce non-target impacts & extends your spray season.
BasalTreat starting at the height of 18 in. ringing stem, herbicide and oil mixture should spread covering to the root collar (Gravity is your friend!)
Cut-surfaceTreat the cross sectional area of the cambium layer at the root collar 1-3 in above the ground.
Hack and squirtUse of modified axe to cut into the tree creating pockets for herbicide delivery
GirdlingMechanical ringing of the tree to kill above ground portion of the tree.Treating cambium layer only ups your chances for control.
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Cut surface Herbicide Applications
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Basal herbicide applicatoin
A high quality basal oil will help spread the mix to cover much of the stem, but be sure to cover entire stem!
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Basal & cut-surface methodsThese methods can be used nearly year round.
Mechanical removal alone won’t provide control for many problematic species.
Mortality unaffected by size.
Garlon 4(20%)+ Ax-it(80%), Garlon 4(20%)+ Stalker(3%) + Ax-it(77%), Garlon 4(15%) + Stalker(3%) + Ax-It(82%) all provide excellent control
Operational differences in test trials suggest Garlon 4 (15%) + Stalker (3%) + Ax-It (82%) is the best choice.
Using products and application methods designed specifically forwoody vegetation provides exceptional levels of control when used carefully and correctly.
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Hack and Squirt applications
Effective method but:SlowLabor intensive Thorns/branchesLimited to late winter and summer High densities decrease efficiency
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Equipment for basal, cut surface and hack and squirt methods
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Aerial applications
Precision guided helicopter spray rigs Or send your crew workers in!
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Broadcast Foliar ApplicationsBroadcast Foliar ApplicationsBroadcast Foliar Applications
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Wide Cast nozzles for low volume ATV spraying
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Foliar treatment experiences
Glyphosate, Imazapyr, and metsulfuronherbicides provide good control of woody species during the late summer and fall spray window.Waiting 1.5 or 2.5 years after mowing to initiate foliar brush treatments is not necessary……Furthermore, waiting increases the presence of other undesirable plant species.
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Low Volume and Ultra Low Volume Back Pack ApplicationGreat for Selective Plant Control in Sensitive areas.
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Herbicides function as….
A disturbance…… is that good or bad?
They can be selective by species, plant group, or application method. Thus they can be used to shape successionalpatterns within a complex of vegetation.
Mode of action or biochemistry and application method determine impact
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Be creative with your sprayer designs to meet your application needs
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Herbicide Stewardship
Importance and necessity of calibration.Function of time, area and volume. Every sprayer needs calibrated regularly.
Mindful of surroundings. Don’t contaminate local water systems.Drift- many of the products used in forestry don’t get along with crops and gardens.
Following the label- THE LABEL IS LAW!
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Calibrate Regularly !
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24 oz 14 oz
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Site Prep – Weed Control
Mow in mid July and again in mid August.Broadcast herbicide
Glyphosate - Roundup, GlyproPlus.Apply in fall – September to early October
Not during dry period – need active growth.On slopes where erosion is a concern, spray herbicide in 3 to 4 feet-wide bands in the tree planting rows. Some hard-to-kill undesirable brush and tree species may require other herbicides to kill them
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Site PreparationDeal with competing vegetation before planting. Particularly important with perennial grasses and broadleaves.
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Bare Ground vs Cover CropBare ground yields the best tree growth rates, but can be expensive to maintain.Cover crops may aid in managing weed growth but can reduce tree growth rates.
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Post-Planting Care –Weed Control First 3 – 5 Years is important
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Post-Planting Care –Weed Control
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Good Weed Control
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Poor Weed Control
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Adequate Weed Control Makes a Difference
3 - 4 growing seasons
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Weed Control – Chemical options
Pre-emergent Herbicides Follow the label and calibrate regularly.○ Simazine - Princep○ Pendimethalin - Pendulum○ Oryzalin - Surflan ○ Sulfometuron – Oust
Post-emergent Herbicide○ Glyphosate - Roundup, GlyproPlus○ Transline
Importance of tank mixing
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Well that’s just how we do it…
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Just because that’s how you always do it…
Doesn’t mean it’s the RIGHT
WAY!!
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0
50
100
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1950 1960 1970 1980 1990 2000
Year
Num
ber o
f Res
ista
nt B
ioty
pes
Development of Resistant Weeds
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Compatible Modes of ActionSome herbicides may not be compatible due to antagonistic MOA’s.
Ex. 2,4-D + RoundUp, Garlon + Arsenal, Krenite and Accord
Amino Acid and Bud Inhibitor herbicides have complimentary activity.
Ex. Krenite + Escort and/or Powerline
Having more than 1 compatible mode of action in the tank is often preferable. WHY ?
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Why use more than one mode of action (chemical tool) in the tank mix?
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Change up the tank mix.
If weed management programs don’t diversify or alternate chemistries (MOA) than problems with resistance can occur.What are weeds?
Specific speciesGroups of speciesDiverse assemblage of species, groups, and populations. Adaptable? - YES
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A population of a single weed species all looks the same, but…
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Seedling weeds represent multiple generations of seed production.
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Detection of Resistant Weeds-Visual
History of using single herbicide mechanism of action for extended periodOnly one species Other species controlledSpecies was previously controlledPresence of resistant populations in area
Beware in areas that were prior row crop!!!Spotty population not being controlled while others are.
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Practices Leading to Resistance
Use of same herbicide for multiple yearsUse of a single herbicide (no mixtures)Use of long-residual herbicidesUse of highly active herbicides aloneDepending on herbicides alone for weed controlPresence of highly sensitive, highly variable species (ex. mares tail, Johnsongrass, foxtail)
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Resistance doesn’t just happen-
It is a product of VM practices.It is a product of VM practices.
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Summing up resistance…
Herbicide resistance is selected through continuous (miss) use of same herbicide.Resistance can be managed with use of herbicide rotations and tank mixtures.Resistance is most likely to cause problems on forest edges, early regenerations, and in tree plantings.When in doubt, assume resistance and treat accordingly.
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If we learn to avoid creating VM problems, life would be easier.
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Invasive and Exotic Species
Definitions:
Invasive plant - any plant that is unwanted and grows or spreads aggressively.
Exotic species – a species that occurs outside of the eco-geographical area where it evolved.
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So what is wrong with invasive species?Invasive species have the ability to:
Spread rapidly Adapt readily to the environmentPersist and negatively alter ecosystems Cost $ $ $ to manage and by reducing production
Invasive species don’t stop at the edge of the woods or at the creek.
Their aggressive nature results in management practices that can be difficult, especially in highly infested areas.
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How do we control them?Like all plants, invasive species react to management in both positive and negative ways.
Some methods actually promote their growth giving them a competitive advantage….
They become an management issue when:1) they establish 2) they out-compete native species 3)you have to create a plan to manage them!
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Yellow =Exotic
BLUE =Native
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Yellow =Exotic
BLUE =Native
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Ailanthus altissima –ailanthustree‐of‐heaven
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Tree of Heaven - Foliar SprayCommon Name Example Brand
NamesComments
glyphosate Roundup, Accord, many others
Apply 2% vol/vol solution in water when leaves active; surfactant if not in herbicide.
triclopyr Garlon 3A, Tahoe 3A
2% vol/vol solution in water when leaves active
triclopyr Garlon 4, Garlon 4 Ultra, Tahoe 4E, Remedy
1.5% vol/vol solution in water when leaves active
metsulfuron methyl Escort XP 1-2 oz/A or 1 gm/gal
ammonium salt of fosamine
Krenite S 30% vol/vol solution
fosamine + metsulfuron methyl
Krenite S + Escort XP
1.5-3 gal/A Krenite S + 1-2 oz/A Escort XP
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Tree of Heaven – Basal SprayCommon Name Example Brand
NamesComments
triclopyr Garlon 4, Tahoe 4E, Remedy, Garlon 4 Ultra
15-20% in basal oil.
triclopyr Pathfinder II RTU formulation, do not dilute.
imazapyr Stalker, Chopper 8-12 oz in gallon of penetrating/basal oil.
triclopyr + imazapyr Garlon 4 + Stalker or equivalent
15-20% Garlon 4 + 3-5% Stalker in penetrating/ basal oil.
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Tree of Heaven – Cut StumpCommon Name Example Brand
NamesComments
glyphosate Roundup, Accord, many others
Dilute with water to no less than 20% active ingredient.
triclopyr Garlon 3A, Tahoe 3A Apply full strength as would a water carried herbicide.
triclopyr Garlon 4, Tahoe 4E,Remedy, Garlon 4 Ultra
20% in basal oil.
triclopyr Pathfinder II Apply full strength as would an oil carried herbicide.
imazapyr Stalker, Chopper 8-12 oz. in a gallon penetrating/basal oil.
Imazapyr
triclopyr + imazapyr
Arsenal
Garlon 4 + Stalker or equivalent
8-12 oz. in a gallon of water
15-20% Garlon 4 + 3-5% Stalker in penetrating/ basal oil.
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AMUR
HONEYSUCKLE(Lonicera maackii)
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Bush Honeysuckle – Foliar SprayCommon Name Example Brand
NamesComments
glyphosate Roundup, Accord, and others
Apply 2% vol/vol water solution or 3-4 qts/A; surfactant if not in herbicide.
2,4-D + triclopyr Crossbow Wet foliage and stems with 1-1.5 gallons Crossbow in 100 gallons water; spot spray with 0.25 pt (½ cup) Crossbow in 3 gallons water.
triclopyr Garlon 3A, Tahoe 3A Apply 3-5% vol/vol water solution.
metsulfuron methyl Escort XP Apply 1-2 oz/100 gallons water + nonionic surfactant or 1 gm/gallon water plus surfactant.
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Common Name Example Brand Names
Comments
triclopyr Garlon 4, Tahoe 4E, Remedy, Garlon 4 Ultra
15-20% in basal oil.
triclopyr Pathfinder II RTU formulation, do not dilute.
imazapyr Stalker, Chopper 8-12 oz in gallon of penetrating/ basal oil.
triclopyr + imazapyr Garlon 4 + Stalker or equivalent
15-20% Garlon 4 + 3-5% Stalker in penetrating/ basal oil.
Bush Honeysuckle – Basal Spray
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Common Name Example Brand Names
Comments
glyphosate Roundup, Accord, many others
Dilute with water to no less than 20% active ingredient.
triclopyr Garlon 3A, Tahoe 3A Apply full strength as would a water carried herbicide.
triclopyr Garlon 4, Tahoe 4E,Remedy, Garlon 4 Ultra
20% in basal oil.
triclopyr Pathfinder II Apply full strength as would an oil carried herbicide.
imazapyr Stalker, Chopper 8-12 oz. in a gallon of penetrating/ basal oil.
imazapyr
triclopyr + imazapyr
Arsenal (Powerline)
Garlon 4 + Stalker or equivalent
8-12 oz. in a gallon of water
15-20% Garlon 4 + 3-5% Stalker in penetrating/ basal oil.
Bush Honeysuckle – Cut Stump
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Autumn Olive
(Elaeagnus umbellata)
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Common Name Example Brand Names
Comments
glyphosate Roundup, Accord, many others
Apply 2% vol/vol solution in water when leaves active; surfactant if not in herbicide.
triclopyr Garlon 3A, Tahoe 3A
2% vol/vol solution in water when leaves active
triclopyr Garlon 4, Garlon 4 Ultra, Tahoe 4E, Remedy
1.5% vol/vol solution in water when leaves active
metsulfuron methyl Escort XP 1-2 oz/A or 1 gm/gal
ammonium salt of fosamine
Krenite S 30% vol/vol solution
fosamine + metsulfuron methyl
Krenite S + Escort XP
1.5-3 gal/A Krenite S + 1-2 oz/A Escort XP
Autumn Olive – Foliar Spray
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Autumn Olive – Cut Stump SprayCommon Name Example Brand Name Comments
glyphosate Roundup, Accord, and others Apply 20% a.i. glyphosate in water to outer third of cut stem/stump surface immediately after cutting (timing critical).
triclopyr Garlon 3A, Tahoe 3A Apply full strength as would a water carried herbicide.
triclopyr Garlon 4, Tahoe 4E, Remedy, Garlon 4 Ultra
20% in basal oil.
triclopyr Pathfinder II Apply full strength as would an oil carried herbicide.
imazapyr Chopper, Stalker 8-12 oz. in a gallon of penetrating/ basal oil.
2,4-D + triclopyr Crossbow 4% Crossbow with 96% penetrating/ basal oil.
picloram + 2,4-D Tordon RTU, Pathway
Tordon 101
Apply full strength as would a water soluble herbicide.Apply Tordon 101 diluted 1:1 with water.
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Common Name Example Brand Names
Comments
triclopyr Garlon 4, Tahoe 4E, Remedy, Garlon 4 Ultra
15-20% in basal oil.
triclopyr Pathfinder II RTU formulation, do not dilute.
imazapyr Stalker, Chopper 8-12 oz in gallon of penetrating/ basal oil.
triclopyr + imazapyr Garlon 4 + Stalker or equivalent
15-20% Garlon 4 + 3-5% Stalker in penetrating/ basal oil.
Autumn Olive – Basal Spray
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Multiflora rose(Rosa multiflora)
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Alliaria petiolata – garlic mustard
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Garlic Mustard – Foliar Spray
Common Name Example Brand Names
Comments
glyphosate Roundup, Accord, and others
1-2% vol/vol in water; surfactant if not in herbicide.
triclopyr Garlon 3A, Tahoe 3A 2% vol/vol
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Lonicera japonica –Japanese honeysuckle
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Microstegium vimineum ‐Japanese stilt grass
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ED & RR
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Prevention is easier!
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Herbicides are prevention and protectionwhen they are included in an IVM plan.
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Even the toughest, most heavily invaded, sites can be tamed!!
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Month 0 : mechanical biomass reduction
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Months 1-8 : woody invasive plants re-grow
• 90.4% of the woody plant re-growth was invasive.
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Month 8 : Plant re-growth is sprayed during early fall. (4 herbicide treatments)
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3 months after planting
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Vegetation management Vegetation management must be done CAREFULLY!!must be done CAREFULLY!!
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Top 10 Forest Invasive Plants
A Landowner’s GuideComing Soon!!!
Zach Lowe & Sally WeeksForestry and Natural Resources
Purdue University
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A sincere Thank You to…
Especially thank you to Dr. Weeks (Purdue University), Dr. Lowe (Purdue University), Lenny Farlee (Purdue University), Greg Ressler (Townsend Chemical Division), Dr. Heiligmann (Ohio State University) and Mitch Blair (University of Kentucky) for the mentoring and contributions to the creation of this presentation.
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We are here to help…..I think.
Please take a kid hunting or fishing…. They are our future!!