Chemical Control of Forest Vegetation

This article details control methods involving pesticides and herbicides by application method.
Chemical Control of Forest Vegetation - Articles

Updated: September 14, 2017

In This Article
Chemical Control of Forest Vegetation

Pesticides specific for plant control are called herbicides. Today's herbicides are a safe and effective method for controlling interfering plants. In forest management, herbicides reduce competition between undesirable vegetation and valuable crop trees as well as aid in regeneration establishment, enhance wildlife habitat, control non-native plants, and facilitate road maintenance. Herbicide applications are a part of any IVM program.

No single herbicide, rate, or application method works for all vegetation management needs. Each situation requires advanced assessment to ensure the safest, most efficient, and cost-effective chemical control program is chosen. Soil type, plant species, density, and size all affect the herbicide prescription. Additional factors such as time of year, and weather conditions are important because they affect plant growth, herbicide uptake, and translocation.

For treating large extensive areas broadcast treatments using helicopters or tractor mounted equipment may be necessary. These treatments are generally done as non-selective applications. However, herbicide application methods are also available to selectively target individual plant species with little or no impact to non-target plants. With selective applications, the herbicide is applied directly to the target plants. These methods include directed foliar sprays, cut surface, and basal bark applications. For detailed herbicide application methods consult the Penn State Extension Herbicides and Forest Vegetation Managementpublication.

Herbicide Treatment Guidelines

Many interfering and competing plants are perennials, with extensive root systems. Herbicide treatments often offer the best means of eradication because they can control root systems without baring soil to erosion or re-invasion. For effective herbicide treatments follow these guidelines:

  • Use herbicide that is most effective at controlling target species.
  • Use herbicide at the lowest labeled rate that will give optimum control.
  • Follow prescribed application methods on label.
  • Apply herbicide at optimum time of year.
  • Follow all label precautions.
  • Be patient, allow time for herbicide to work. Results may not be evident until the following growing season.


Skidder mounted mist blowers provide a non-selective understory treatment neccessary to control interfering vegetation when trying to naturally establish hardwood seedling regeneration.

Herbicides control trees, shrubs, vines, and grasses to allow desirable crop trees and seedlings to grow. Penn State Extension provides the following information and guidelines on herbicide use. These tables are not intended as a complete guide.

Before using any pesticide, read and follow the label. Labeled pesticides undergo thorough testing. Following recommendations on the manufacturer's label prevents many potential problems that may arise from incorrect product use.

Information is provided here with the understanding that no discrimination is intended and no endorsement by Penn State Extension is implied. Authors assembled the most reliable information available to them at time of publication. Due to constantly changing laws and regulations, authors can assume no liability for the recommendations. Any use of a pesticide contrary to instructions on the printed label is not legal or recommended.

For specific application rates, application costs, and recommendations check with company sales representative or herbicide distributor.

(Revised from J. Miller, Nonnative Invasive Plants of Southern Forests: A Field Guide for Identification and Control, U.S. Forest Service Southern Research Station, 2003.)

Common Forestry Herbicides

Herbicides commonly used in forestry are available under a variety of trade names. Therefore, it is best to become familiar with common names (active ingredients).

The following table lists alphabetically by common name forestry herbicides labeled for use in Pennsylvania. The herbicides are effective for controlling competing vegetation in northeastern hardwood and coniferous forests. The trade name and manufacturer are shown in the columns that follow. Trade names are grouped according to active ingredient. This table is strictly a guide and is not meant to be all inclusive. No endorsement or support if an individual product or company is given or implied.

This information in taken from product labels and material safety data sheets. (See Crop Data Management Systems, Inc. for more information.)

Common Name (Active Ingredient)Trade Name Manufacturer
2, 4-D DMA 4 IVMDow AgroSciences
Clopyralid TranslineDow AgroSciences
Clean SlateNufarm
Dicamba VanquishNufarm
Fosamine Krenite SAlbaugh/Bayer
Glyphosate Accord ConcentrateDow AgroSciences
Accord XRT IIDow AgroSciences
Roundup Pro ConcentrateMonsanto
Foresters'Nufarm
RazorNufarm
Razor ProNufarm
RefugeSyngenta
RodeoDow AgroSciences
Glyphosate and Imazapyr OneStepBASF
Hexazinone Velpar DFBayer
Velpar LBayer
VelossaHelena
Imazapyr Arsenal ACBASF
ChopperBASF
StalkerBASF
Polaris ACNufarm
Polaris SPNufarm
Metsulfuron Methyl Escort XPBayer
PatriotNufarm
Picloram Tordon KDow AgroSciences
Trooper 22KNufarm
Picloram and 2, 4-D Tordon 101 MixtureDow AgroSciences
Trooper 101 MixtureNufarm
PathwayDow AgroSciences
Sulfometuron Methyl Oust XPBayer
SpyderNufarm
Sulfometuron Methyl and Mesulfuron Methyl Oust ExtraBayer
Triclopyr Element 3ADow AgroSciences
Element 4Dow AgroSciences
Garlon 3ADow AgroSciences
Garlon 4 UltraDow AgroSciences
Pathfinder IIDow AgroSciences
Relegate RTUNufarm
Tahoe 3ANufarm
Tahoe 4ENufarm

Stem Injection/Frill Girdle

This is the Hack and Squirt method. Herbicide name(s), required application equipment, application method, mixture rate and time of year are provided.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
2,4-DDMA 4 IVM Injection or hatchet frill girdle and spray bottleInjector: 1 - 2 ml per inch of trunk diameter. Frill girdle: continuous frill, fill cuts with mixtureInjector: undiluted.
Frill girdle: 2.6 oz/gal of water
Any season, except during heavy sap flow in spring
ClopyralidClean Slate, TranslineInjection or axe frill girdle and spray bottleInjector and Frill Girdle:1/2 ml undiluted or 1 ml diluted. 3"-4" between wound centers. At convenient height. Controls legumes only.Undiluted or diluted 1 to 1 with waterPeriods of active growth
DicambaVanquishHatchet frill girdle and spray bottle or brushContinuous frill, spray or paint cut surface within 30 min30% - 50% solution in waterAny season, except during heavy sap flow in spring
GlyphosateAccord Conc., Accord XRTII, Foresters', Razor and Razor Pro, Refuge, Rodeo, Roundup Pro Conc.Injection or hatchet frill girdle and spray bottleApply to evenly spaced cuts or continuous frill below all live branches. Best results achieved with diluted material in continuous frill25% to 100% solution in water. 1ml per 2-3 inches of trunk diameterDuring active growth after full leaf expansion
HexazinoneVelossa, Velpar L Injector or Hypo-HatchetInject 1 ml at 4 inch intervals around treeUndilutedSummer
ImazapyrArsenal AC, Polaris AC Injection or hatchet frill girdle and spray bottle or brushInjector: 1ml per cut, 1" interval between cuts. Frill girdle: 2" interval between cuts, thoroughly wet cutsDiluted: 6 oz/gal waterAny season, except during heavy sap flow in spring
ImazapyrStalker, Polaris SPInjection or hatchet frill girdle and spray bottle or brushInjector: 1 ml per cut, 1" interval between cuts. Frill girdle: 2" interval between cuts, thoroughly wet cuts8-12 oz/gal water, diesel oil, or penetrating oilAny season, except during heavy sap flow in spring
Picloram and 2, 4-DPathwayInjector or hatchet frill girdle and spray bottleInjector - 1 ml. in each cut, 2" - 3" between edges. Frill girdle: complete frill low on stem, spray or paint injured surface until wetUndiluted: ready-to-useAny season, except during heavy sap flow in spring
Picloram and 2, 4-DTordon 101 M, Trooper 101 M (Restricted Use)Injector or hatchet frill girdle and spray bottleInjector: 1/2 ml undiluted or 1ml diluted at each injector site spaced 3" between wounds Frill girdle: complete frill, wet cut surface with diluted solutionUndiluted or diluted 1:1 with waterAny season, except during heavy sap flow in spring or during periods of drought
TriclopyrElement 3A, Garlon 3A, Tahoe 3AInjector or axe frill girdle and spray bottleInjector: 3"-4" between wound centers. Frill girdle: continuous frill. 1/2 ml undiluted or 1 ml diluted at wound/cutUndiluted or diluted 1:1 in waterAny season, except during heavy sap flow in spring

Cut Stump

Applications applied to freshly cut stump surface. Herbicide name(s), required application equipment, application method, mixture rate and time of year are provided.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
2,4-DDMA 4 IVM Backpack sprayer or spray bottleThoroughly soak entire stump including surface, bark, and exposed roots immediately after cutting2.6 oz/gal of waterAny season, except during heavy sap flow in spring
ClopyralidClean Slate, TranslineSprayer or brushSpray or paint freshly cut surface including cambial area. Legume family only.Mix 50/50 with waterPeriods of active growth
DicambaVanquishBackpack sprayer, spray bottle, or brushSpray or paint to wet cambium area of freshly cut stumps within 30 min30% - 50% solution in waterAny season, except during heavy sap flow in spring
FosamineKrenite S Backpack sprayer with low pressureWet cambium and bark around stump down to root collar areaUndiluted or diluted 1:1 with waterAny season, except during heavy sap flow in spring
GlyphosateAccord Conc., Accord XRT II, Foresters', Razor and Razor Pro, Refuge, Rodeo, Roundup Pro ConcBackpack sprayer or spray bottleCut stumps close to soil surface, wet cambial area immediately on freshly cut surface50% to 100% solution in waterPeriods of active growth and full leaf expansion
ImazapyrArsenal AC, Polaris AC Backpack sprayer, spray bottle, or brushThoroughly wet entire cambial area of freshly cut stump.Diluted: 6 oz/gal waterAny season, except during heavy sap flow in spring
ImazapyrChopper, Polaris SP, StalkerBackpack sprayer, spray bottle, or brushSpray or brush to thoroughly wet cambium area of freshly cut stump8-16 oz/gal water, diesel oil or penetrating oilAny season, except during heavy sap flow in spring
Picloram and 2, 4-DPathwayBackpack sprayer or spray bottleSpray or paint cambium area of freshly cut stump surfaces.Undiluted: ready-to-useAny season, except during heavy sap flow in spring
Picloram and 2, 4-DTordon 101 M, Trooper 101 M (Restricted Use)Backpack sprayer, spray bottle, or brushSpray or paint cambium area of freshly cut stumpsUndiluted or diluted 1:1 with waterAny season, except during heavy sap flow in spring or during periods of drought
TriclopyrElement 3A, Garlon 3A, Tahoe 3ABackpack sprayer, spray bottle, or brushSpray of paint cambium area of freshly cut stumpsUndilutedAny season, except during heavy sap flow in spring
TriclopyrElement 4, Garlon 4 Ultra, Tahoe 4E Backpack sprayer with solid cone or flat fan nozzleThoroughly wet root collar, stump sides and cambial area of the cut surface.20% - 30% in basal oil, diesel fuel, fuel oil, or keroseneYear round, except when snow or water prevent spraying to ground line
Triclopyr Forestry Garlon XRTBackpack sprayer with solid cone or flat fan nozzleThoroughly wet root collar, stump sides and cambial area of the cut surface.13% - 20% in basal oil, diesel fuel, fuel oil, or kerosene. Using low volume and low pressure.Year round, except when snow or water prevent spraying to ground line
TriclopyrPathfinder II, Relegate RTU Backpack sprayer, spray bottle, or brushTreat root collar, stump sides and cambial area of the cut surface.Ready-to-use (petroleum distillate in the product)Year round, except when snow or water prevent spraying to ground line

Basal Bark

Applications applied to the base of the tree or shrub. Herbicide name(s), required application equipment, application method, mixture rate and time of year are provided.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
2,4-DDMA 4 IVM Backpack sprayerWet base and root collar until spray begins to accumulate at ground line2.6 oz/gal of waterYear round, except when snow or water prevent spraying to ground line
ImazapyrChopper, Polaris SP, StalkerBackpack sprayer - low volumeSpray to wet lower 12"-18" of stem including root collar8-12 oz. in 1gal diesel oil or penetrating oilYear round, except when snow or water prevent spraying to ground line
TriclopyrGarlon 4 Ultra, Tahoe 4E Backpack sprayer - low volume and pressure, solid cone or flat fan nozzleSpray to wet lower 12" - 15" of stem including root collar areaLow volume application 20% - 30% in basal oil, diesel fuel, fuel oil, or keroseneYear round, except when snow or water prevent spraying to ground line
TriclopyrPathfinder II Backpack sprayer - low pressure, solid cone or flat fan nozzleSpray to wet lower 12" - 15" of stem.Ready-to-use (petroleum distillate in the product)Year round, except when snow or water prevent spraying to ground line

Basal Soil

Application is directly to the soil surface. Herbicide name(s), required application equipment, application method, mixture rate and time of year are provided.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
DicambaVanquish (multiflora rose control only) Hand spot gunSingle stem: apply directly to soil within 6" to 8" of root crownDependent upon multiflora rose canopy diameter. No more than 2 qts/acApply when plants are dormant
HaxazinoneVelpar DF Exact delivery handgun applicatorApply to soil surface in grid pattern or spot soil within 3 feet of single stem root collar to be controlledGrid: undiluted,. 6 - 5.2 ml per spot, depends on soil texture. Single stem: 2 2/3 lb/gal of water, 2-4 ml for each inch of DBHApply from hardwood bud break to early summer
HaxazinoneVelpar L Exact delivery handgun applicatorApply to soil surface in grid pattern or spot soil within 3 feet of single stem root collar to be controlledGrid: undiluted,. 6 - 5.2 ml per spot, depends on soil texture. Single stem: undiluted, 2 - 4 ml for each inch of DBHApply from hardwood bud break to early summer
Metsulfuron MethylPatriot, Escort XP (multiflora rose control only) Hand spot gunSingle stem: apply 4 ml for each 2' of canopy diameter to soil within 2' of stem1 oz per gal of waterEarly spring to summer

Site Preparation: Hardwood Planting

Site preparation treatments typically prepare harvested sites or sites with existing vegetation for either natural or artificial (planting) regeneration. The chemistry used will vary depending on the site and the objective. Many of the active ingredients used are soil active, particularly for sites that will be planted with pine. All competing vegetation is controlled so the planted seedlings will be free to grow.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
ClopyralidClean Slate, TranslineHelicopter, skidder, tractor or backpack sprayerBroadcast foliar or spot applications. Spray to wet uniform coverage1/4 to 1 1/3 pints/ac in 5 or more gal of waterAnytime during the growing season. Preferred when weeds are small and actively growing
GlyphosateAccord Conc., Accord XRTII, Foresters', Razor and Razor Pro, Rodeo, Roundup Pro Conc. Helicopter, skidder, backpack, or mistblowerBroadcast foliar, spray-to-wet, and low volume directed sprayVaries by method of application, check label to see if additional surfactant is neededPrior to planting, during active growth following full leaf expansion
Metsulfuron MethylEscort XP, Patriot Helicopter or skidderBroadcast foliar application on sites where yellow poplar is to be plantedUp to 2 oz/ac plus 1/4% surfactantPrior to planting, during active growth following full leaf expansion
Sulfometuron MethylOust XP, Spyder Helicopter or skidderBroadcast foliar application for broadleaf weed control3 - 5 oz/acPrior to planting, during active growth following full leaf expansion

Site Preparation: Natural Hardwood Regeneration

Site preparation treatments typically prepare harvested sites or sites with existing vegetation for either natural or artificial (planting) regeneration. The chemistry used will vary depending on the site and the objective. Many of the active ingredients used are soil active. All competing vegetation is controlled so hardwoods will be free to regenerate.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
Glyphosate and Sulfometuron MethylAccord Concentrate and Oust XPSkidder or backpack mistblowerBroadcast foliar application following shelterwood seed cut2 qts Accord & 2 oz. Oust XP per acre, plus 1/2% non-ionic surfactantMid summer to early fall
GlyphosateAccord Conc., Foresters'Skidder, backpack sprayer, or mistblowerBroadcast foliar or spray to wet foliage (but not to point of runoff)2% - 5% solution, plus 1/2% non-ionic surfactantGrowing season following full leaf expansion
Sulfometuron MethylOust XPSkidder or backpack sprayerBroadcast foliar application following shelterwood seed cut2 - 5 oz in 25 - 50 gal water/ acGrowing season during active herbaceous weed growth

Release Treatments: Hardwood

Release treatments are herbicide applications applied to “release” existing trees that were either planted or naturally established from competing vegetation. They can be hand applied spot treatments or broadcast applications made with helicopters and ground machinery. The chemistry used and the time of year is important so as not to harm the existing seedlings. These are “selective” applications that control competing plants and allow the desired trees to be free to grow.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
ClopyralidClean Slate, TranslineHelicopter, skidder, tractor, or backpack sprayerBroadcast foliar application made over the top of tolerant tree species or directed wet spot applications1/4 to 1 1/3 pints/ac in 5 or more gal of waterAnytime during the growing season. Preferred when weeds are small and actively growing
GlyphosateAccord Conc., RodeoBackpack sprayerDirected spray to wet, avoid contact with desirable plant species1% - 2% spray to wet or 5% - 10% low volume directed spray, mix with non-ionic surfactantSummer, during periods of active growth, after full leaf expansion and before fall color
GlyphosateRefugeBackpack sprayerDirected spray to wet, avoid contact with desirable plant species.8% - 1.7% spray to wet or 4% - 8% low volume directed spray. Use. 5-1.5% non-ionic surfactantSummer, during periods of active growth, after full leaf expansion and before fall color
HexazinoneVelossa, Velpar L (yellow poplar only)Helicopter or skidderBroadxast foliar application over top of planted seedlings4 - 6 pints in 5 - 25 gal of water per acreEarly spring, after soil has settled around planting slit and before but break
Metsulfuron MethylEscort XP, Patriot Helicopter or skidderBroadcast foliar application over top of yellow poplar seedlings onlyUp to 2 oz/acEarly spring, after soil has settled around root system and prior to bud break. Herbaceous weeds: apply pre-emergence or shortly thereafter
Sulfometuron MethylOust XP, Spyder Helicopter or skidderBroadcast foliar application over top of planted seedlings1- 4 oz/acEarly spring, after soil has settled around planting slit and before bud swell stage

Site Preparation: Conifer Planting

Site preparation treatments typically prepare harvested sites or sites with existing vegetation for either natural or artificial (planting) regeneration. The chemistry used will vary depending on the site and the objective. Many of the active ingredients used are soil active, particularly for sites that will be planted with pine. All competing vegetation is controlled so the planted seedlings will be free to grow.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
ClopyralidClean Slate, TranslineHelicopter, skidder, tractor, or backpack sprayerBroadcast foliar or spot applications. Spray to wet uniform coverage1/4 to 1 1/3 pints/ac in 5 or more gal of waterAnytime during the growing season. Preferred when weeds are small and actively growing
DicambaVanquishHelicopter or skidderBroadcast foliar application, uniformly cover undesirable foliage2 qts max per acre, with non-ionic surfactantDuring periods of active growth
FosamineKrenite S Helicopter or skidderBroadcast foliar application2 - 6 qts/ac plus 16 oz/ac non-ionic surfactantApply mid-summer to early fall
GlyphosateAccord Conc., Accord XRTII, Foresters', Razor and Razor Pro, Rodeo, Roundup Pro ConcHelicopter, skidder, backpack mistblowerBroadcast foliar, spray-to-wet, and low volume directed spray foliar applicationsVaries by method of application, check label to see of additional surfactant is neededPrior to planting, active growth following full leaf expansion
Glyphosate and ImazapyrOne Step Helicopter, skidder or backpack sprayerBroadcast foliar applications, directed foliar or spot sprays5 - 16 pts/ac or 5% - 10% spray solutionDuring periods of active growth
HaxazinoneVelpar DF Helicopter or skidderBroadcast foliar application2 2/3 lb/ac - 6 2/3 lb/ac dependent upon soil textureEarly spring - early summer after bud break and before hardening off
HaxazinoneVelossa, Velpar L Helicopter or skidderBroadcast foliar application3 - 10 qts/ac dependent upon soil textureEarly spring - early summer after bud break and before foliage hardens off
ImazapyrArsenal AC, Polaris AC Helicopter or skidderBroadcast foliar applicationSpecies dependent, 12-40 oz/ac, 1/2% non-ionic surfactantSummer, in advance of regeneration
ImazapyrChopper, Polaris SPHelicopter, skidder, or backpackBroadcast foliar applicationSpecies dependent, 24-80 oz/acGrowing season following full leaf expansion
Metsulfuron MethylEscort XP, Patriot Helicopter or skidderBroadcast foliar applicationUp to 4 oz/ac for loblolly pine or 2 oz/ac for red pine plus 1/4% surfactantDuring periods of active growth following full leaf expansion
PicloramTordon K, Trooper 22K (Restricted Use)Helicopter or skidderBroadcast foliar application1 - 2 qts/acDuring periods of active growth
Picloram and 2, 4-DTordon 101 M, Trooper 101 M (Restricted Use)Helicopter or skidderBroadcast foliar application1 - 2 gal/acDuring periods of active growth
Sulfometuron Methyl and Metsulfuron MethylOust Extra Helicopter or skidderBroadcast foliar applications for loblolly and red pine onlySpecies dependent,
1 1/3 - 4 oz/ac
After full leaf expansion in spring and before normal defoliation in fall. Herbaceous weeds: apply pre-emergence or shortly thereafter
Sulfometuron MethylOust XP, SpyderHelicopter or skidderBroadcast foliar spray for herbaceous weed controlVaries by species, 2 - 8 oz / acEarly spring, before herbaceous weeds emerge or shortly thereafter
TriclopyrElement 3A, Garlon 3, Tahoe 3AHelicopter or skidderBroadcast foliar applications2 gal/ac, 10-30 gal. spray volume, plus non-ionic surfactantDuring periods of active growth
TriclopyrElement 4, Garlon 4 Ultra, Tahoe 4EHelicopter or skidderBroadcast foliar applications3 - 6 qts/acDuring periods of active growth
TriclopyrForestry Garlon XRTHelicopter or skidderBroadcast foliar applications2 - 4 qts/acDuring periods of active growth

Release Treatments: Conifer

Release treatments are herbicide applications applied to “release” existing trees that were either planted or naturally established from competing vegetation. They can be hand applied spot treatments or broadcast applications made with helicopters and ground machinery. The chemistry used and the time of year is important so as not to harm the existing seedlings. These are “selective” applications that control competing plants and allow the desired trees to be free to grow.

Active Ingredient
Herbicide Trade Name(s)
Application Equipment
Application Method
Mixture (Rate)
Time of Year
2, 4-DDMA 4 IVM Helicopter or skiiderBroadcast foliar application1 1/2 to 3 qts/acMid to late summer, after conifers have hardened off
ClopyralidTranslineHelicopter, skidder or backpack sprayerBroadcast foliar application made over the top of tolerant tree species or directed spray to wet spot applications for broadleaf weed control1/3 to 2/3 pint/ac or 1/4 oz/gal of waterAnytime during the growing season
GlyphosateAccord Conc., Foresters', Razor and Razor ProHelicopter, skidder, backpack sprayerBroadcast foliar application3/4 to 2 qts plus 1/2% non-ionic surfactant, 5 gal spray solution/acLater summer or early fall, after formation of final conifer resting bud
HaxazinoneVelpar DF Helicopter or skidderBroadcast foliar applicationDepends upon species released and soil texture; 1 1/3 - 4 lb/acSpring after bud break and before full leaf expansion
HaxazinoneVelpar L Helicopter or skidderBroadcast foliar applicationDepends upon species released and soil texture; 2 - 8 qts/acSpring after bud break and before full leaf expansion
ImazapyrArsenal AC, Polaris AC Helicopter, skidder, or backpack sprayerBroadcast foliar application or directed foliarSpecies dependent, 6 - 20 oz/ac, 1/4% non-ionic surfactantLate in second growing season following planting
ImazapyrChopper, Polaris SPBackpack sprayerDirected foliar spray applications2% - 10% mix in waterLate in growing season after formation of final conifer resting bud
Metsulfuron MethylEscort XP, Patriot Helicopter or skidderBroadcast foliar application1 - 4 oz/ac for loblolly pine onlyActive growth following full leaf expansion. Herbaceous weeds: apply pre-emergence or shortly thereafter
Sulfometuron Methyl and Metsulfuron MethylOust Extra Helicopter or skidderBroadcast foliar spray, loblolly pine only2 2/3 - 4 oz. per acActive growth following full leaf expansion. Herbaceous weeds: apply pre-emergence or shortly thereafter
Sulfometuron MethylOust XP, SpyderHelicopter, skidder, or backpack sprayerBroadcast foliar spray for herbaceous weed controlVaries by species, 1 - 8 oz / acDormant season prior to conifer bud break
TriclopyrGarlon 3A, Tahoe 3AHelicopter, skidder, or backpack sprayerBroadcast foliar or directed spray application with flat fan nozzel or equivalent2 - 4 qts/ac or 1 - 2% mix plus non-ionic surfactantLate summer or early fall, after formation of final conifer resting bud
TriclopyrGarlon 4 Ultra, Tahoe 4EHelicopter, skidder, or backpack sprayerBroadcast foliar applications or directed foliar spray1.5 - 3 qts per acre or 4% - 20% solution in waterLate summer or early fall after formation of final conifer resting bud, prior to fall coloration

Instructors

Silviculture Timber Sales Forest Ecology Forest Vegetation Management Herbicides Invasive Plants White-tailed Deer Youth Environmental Education 4-H Forestry

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