Access Herbicide

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Access Herbicide by Corteva Agriscience combines 240 g/L Triclopyr and 120 g/L Picloram in a diesel-compatible liquid hydrocarbon formulation for selective control of over 50 woody and noxious weed species.

It targets hard-to-kill species such as Lantana, Rubbervine, Parkinsonia, Brigalow, and Prickly acacia in pastures, fence lines, forestry, and non-crop areas across Australia. Two proven application methods are available: standard basal bark (1:60 with diesel) for general use, and the Access ThinLine method (1:9 with diesel) for smooth-stemmed species requiring less chemical and time per stem. Cut stump application is also available for larger plants beyond basal bark size limits.

Pack Sizes: 1 L & 5 L. Registrant: Corteva Agriscience (APVMA #: 46640/102551)

Click For Technical Info & Tips For Use
5 out of 5 (3 customers reviews)

QuantityDiscountStatus
2 or more$155.00 eachAvailable
4 or more$455.00 eachAvailable
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This item is large and requires a courier! Ensure a courier can reach your address.
Don’t worry, shipping is STILL FREE!
Click here for shipping info or give us a call.

Ordering multiple large items? They will be shipped on a skid or pallet to ensure that your items arrive safely and securely. The delivery truck will need to be unloaded with a forklift. If you do not have a forklift, please provide an address where a forklift is present.

Access Herbicide ACCESS Corteva

Description

Access Herbicide: Proven Woody Weed Control for Australian Pastures and Non-Crop Areas

Access Herbicide is a dual-active, oil-based woody weed herbicide from Corteva Agriscience, combining 240 g/L Triclopyr (as the butoxyethyl ester) and 120 g/L Picloram (as the isooctyl ester) in a 389 g/L liquid hydrocarbon solvent. It delivers selective control of a wide range of woody and noxious weeds across pastures, fence lines, commercial areas, public lands, and forestry by basal bark and cut stump application. Because it uses diesel as its carrier, Access bypasses the limitations of water-based spraying and gets active ingredients directly into the vascular tissue of target plants. This makes it a reliable option where conventional foliar spraying is impractical or restricted.

Access controls over 50 weed species, including Lantana, Parkinsonia, Rubbervine, Prickly acacia, Camphor laurel, Leucaena, Brigalow, and multiple Acacia spp. Two application methods are available: standard basal bark (1:60 with diesel) and the Access ThinLine method (1:9 with diesel) for smooth-stemmed species. The ThinLine method reduces both diesel use and treatment time per stem. Cut stump treatment is available for larger plants that exceed basal bark size limits.

What weeds does Access Herbicide control?

Access controls 50+ woody and noxious weed species, including Lantana, Rubbervine, Parkinsonia, Prickly acacia, Camphor laurel, Chinee apple, Brigalow, and cacti species. Refer to the Directions for Use table for the full species list and application method for each.

Does Access Herbicide mix with water?

No. Access is designed for use with diesel distillate only. It will not mix with water. Use Biosafe as an alternative carrier to diesel where required.

What is the ThinLine method?

ThinLine is a targeted basal bark technique for smooth-stemmed species (Acacia spp., excluding Mimosa bush, Cockspur thorn, Corymbia spp., Leucaena, Parkinsonia). Mix at 1 part Access to 9 parts diesel and apply to the stem from ground level up to 5 cm high. This uses less diesel per treatment.

Application Rate Summary

Method Rate Carrier
Basal bark (most species) 1 L/60 L Diesel or Biosafe
Basal bark (Broadleaf privet, Guava, Swamp box) 2 L/60 L Diesel or Biosafe
Cut stump (Willow) 4 L/60 L Diesel or Biosafe
ThinLine (smooth-stemmed) 1 L/10 L Diesel or Biosafe

Australia’s top 10 woody weeds and how to control them

Features & Benefits

  • Dual-active formula: 240 g/L Triclopyr and 120 g/L Picloram work together for reliable knockdown and root kill of difficult woody weed species.
  • Controls 50+ species: Targets Lantana, Rubbervine, Parkinsonia, Brigalow, Prickly acacia, Camphor laurel, Chinee apple, cacti, and many more.
  • Two basal bark methods: Standard (1:60 diesel) for general use; ThinLine (1:9 diesel) for smooth-stemmed species, using less diesel per treatment.
  • Cut stump application available: Effective on larger plants that exceed the basal bark size limit, with immediate treatment post-cut.
  • Diesel-only carrier: Oil-based formulation penetrates bark more effectively than water-based products and is suited to dry-stem application conditions.
  • Broad site registration: Registered for use in pastures, fence lines, forestry, commercial and industrial areas, public lands, and rights-of-way.
  • Group I Herbicide (Pyridines): Disrupter of plant cell growth. Rotate with other herbicide groups to reduce resistance risk.
  • Flexible pack sizes: Available in 1 L and 5 L to suit operations from spot treatment to large-scale weed management.

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5 out of 5 stars

3 reviews

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What others are saying

  1. matt

    Access herbicide

    matt (verified owner)

    Bought online plenty of times, has always been prompt delivery with minimal delay.

    Upvote if this was helpful (0) Downvote if this was not helpful (0) Flag for removal

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  2. Peter Monk

    Good Service

    Peter Monk (verified owner)

    The product is very reasonably priced, easily ordered and promptly delivered.

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  3. Kerryl

    Access

    Kerryl (verified owner)

    It Kills everything.

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  4. Question

    Brandon

    Do I need a acdc licence to use this in Queensland

    Upvote if this was helpful (0) Downvote if this was not helpful (0) Flag for removal

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    • class="comment byuser comment-author-specialistsales even depth-2" id="li-comment-171280">
      specialistsales

      specialistsales

      Access Herbicide is legal to be purchased and applied by the general public in Qld. This may change if the situation you are spraying in is regulated by local or state government laws which you need to check on a case by case basis.

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Directions Of Use

Click here for Access Herbicide directions for use.

Access Herbicide controls woody and noxious weeds using basal bark or cut stump application. Mix Access with diesel distillate only. Do not add water. For standard basal bark, dilute 1 L of Access to 60 L of diesel and liberally spray the bark from ground level to 30 cm high, wetting thoroughly to the point of runoff. For the ThinLine method on smooth-stemmed species, dilute at 1:9 (Access to diesel) and spray the stem from ground level up to 5 cm high. For cut stump applications, cut stems less than 15 cm above ground level and apply the Access/diesel mixture immediately to the cut surface and sides. Apply with hand-directed, low-pressure equipment (up to 200 kPa) using Viton seals. Do not treat dormant or stressed plants. Ensure all stems on multi-stemmed varieties are treated.

Rate Volume of Access Fill to 1 L Fill to 5 L
1 L/60 L 17 mL 83 mL 167 mL
2 L/60 L 33 mL 167 mL 333 mL
4 L/60 L 67 mL 333 mL 667 mL
1 L/10 L (ThinLine) 100 mL 500 mL 1 L

Standard Basal Bark Application:

Basal bark application is used to treat saplings and regrowth generally less than 5 cm in basal diameter. Access is applied mixed with diesel to assist penetration through the bark. Weeds with thick, corky bark cannot be treated successfully using this method. Do not treat if the stems are wet or charred, as this prevents the herbicide from penetrating through the bark.

Thinline Application:

The thinLine application is a modified version of the basal bark application. For smooth-stemmed species (as per label on back), mix Access at 1:9 with diesel and treat the stem of the plant from ground level up to 5 cm high. This technique uses less diesel and reduces the time required to treat each stem compared to conventional basal bark spraying.

Weeds Table:

Acacia spp. including Cockspur thorn Red ash (white myrtle)
Black wattle Corkwood wattle Rubber Vine
Brigalow Corymbia spp. Swamp box
Hickory wattle Ellangowan poison bush Sweet briar
Mimosa bush Eucalyptus spp. regrowth Teatrees
Mulga False sandalwood Turpentine
Sally wattle Green cestrum Turpentine bush
Silver wattle Grevillea spp. Whitewood
African boxthorn Groundsel bush Wild orange
Algaroba (Prosopis spp.) Guava Wild peach
Australian blackthorn Hard milkwood Wild rosemary
Bitterbark Hawthorn Wild tobacco tree
Broadleaf privet Heartleaf poison bush Wilga
Brush box Honey locust Yellow bells (Tecoma spp.)
Cacti including : Kiteleaf Camphor laurel
Common pest pear Leucaena Peppercorn tree
Harrisia cactus Lime Bush (Schinus molle)
Prickly pear Lantana Prickly acacia
Snake cactus Narrow leaf hop bush Sisal hemp
Tiger pear Needlewood Tree of Heaven
Tree pear Oleander Willow
Punty bush   Parkinsonia Chinee apple

Rates are a general guide only. Before opening, carefully read Access Herbicide Directions for Use, Precautionary and Protection Statements, Storage and Disposal, Safety Directions and First Aid Instructions.  The product is designed for the particular purpose indicated on the label. Failure to use the product strictly as directed may be illegal, dangerous and render the product ineffective.

Questions and answers from customers

    Hi looking at mixing Access Herbicide with diesel at a ratio of 1 to 9. Can you please advise how many mL Access Herbicide is required for a 5L sprayer?

  1. Q Hi looking at mixing Access Herbicide with diesel at a ratio of 1 to 9. Can you please advise how...... Read more
    Asked by Darrell on April 6, 2024 8:53 am
    A

    Access Herbicide registered 'directions for use'  can be found on the Specialist Sales product page by scrolling down to 'SDS & Technical'. A pdf will be available to view, download or print. Included in the 'directions for use' is a 'Dilution Table' with the breakdown of each of the recommended common mixing rates into mL. The rate 1:9 (ThinLine application) equates to 555mL Access Herbicide to be added to 5L diesel.

  2. I basal barked some bamboo with Access Herbicide 6-months ago. Will it still be in the soil if I want to plant something else?

  3. Q I basal barked some bamboo with Access Herbicide 6-months ago. Will it still be in the soil if I ...... Read more
    Asked by Tess on September 28, 2022 2:55 pm
    Answered by the admin

    Access Herbicide is made from Triclopyr and Picloram. Picloram has residual properties that linger in the soil for some time. The US EPA (Environmental Protection Agency) indicates that Picloram degrades very slowly if applied to soil, with half-lives ranging from 90 to 513 days, depending on the formulation and quantity applied. The half-life is the period it takes one-half of the amount of pesticide in the soil to degrade. Each passing half-life reduces the amount of pesticide present in the soil by one-half, i.e. 1 to 1/2 to 1/4 to 1/8 to 1/16, etc. Half-life can vary due to soil microbial populations, moisture, temperature, and other factors. If you only applied Access Herbicide to the bamboo and not to the soil over six months ago, it is unlikely any residual issues would stop you from replanting.

  4. What is the injection method
  5. Q What is the injection method
    Asked by Ivan battis on December 27, 2021 3:32 pm
    Answered by the admin

    Access Herbicide is only registered to be applied by Basal Bark, Thinline and Cut Stump applications.  It is not recommended to be used as a stem injection.  More information on the recommended application techniques is available on the Specialist Sales website in the ''technical and SDS tab.

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Disclaimer: This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Host & Pest

Host Pest
Host & Pest
Commercial Land, Industrial Land, Forestry, Non-crop Area - General, Pasture & Rights Of Way African Boxthorn, Algaroba, Angophora - Regrowth, Australian Or Native Blackthorn, Bitter Bark Or Quinine Tree, Black Or Brisbane Black Wattle, Brigalow, Broadleaf Privet, Brown Salwood Or Hickory Wattle, Brush Box, Budda Or False Sandalwood, Camphor Laurel, Chilean Cestrum, Chinee Apple, Cockspur Thorn, Common Pest Pear, Corkwood Wattle, Corymbia Spp., Ellangowan, Eucalyptus, Grevillea Spp., Groundsel Bush, Guava, Hard Milkwood, Harrisia Cactus, Hawthorn, Heartleaf Poison, Hickory Wattle, Honey Locust, Kiteleaf Poison, Lantana - Lantana Camara, Leucaena, Limebush, Mimosa Bush, Mulga, Narrow Leaf Hop Bush, Needlewood, Oleander, Parkinsonia, Pepper Tree, Prickly Acacia, Prickly-pear, Punty Bush, Red Ash, Rubber Vine, Sally Wattle, Silver Wattle, Sisal Hemp, Snake Cactus, Swamp Box, Sweet Briar Or Wild Rose, Teatree, Tiger Pear, Tree Pear, Tree-of-heaven, Turpentine Bush, Turpentine Tree, Whitewood, Wild Orange, Wild Peach, Wild Rosemary, Wild Tobacco Tree, Wilga - Tree, Willow, Yellow Bells
Fenceline Weed Control Calotrope

Tips For Use

Restraints:

  • Do not add water to Access Herbicide.
  • Do not apply to weeds that are stressed (not actively growing) due to extreme cold, drought, waterlogging, disease, poor nutrition, or prior herbicide treatment. Reduced control may result.
  • Do not apply to charcoal-coated or wet stems. This repels the diesel mixture.
  • Do not treat dormant species (e.g. Australian blackthorn, camphor laurel, sweet briar) during winter.

Mixing Instructions:

  • Quarter-fill the spray unit with diesel, then add the required volume of Access.
  • Top up with remaining diesel and agitate thoroughly.
  • Mix only the sufficient chemical for each day’s use.

Compatibility:

  • Access is compatible with diesel and Biosafe only.
  • Do not mix with any other chemicals.
  • For alternative biodiesel products, seek advice from Dow AgroSciences prior to use.

General Application Instructions:

  • Use hand-directed equipment only (e.g. pneumatic sprayer) at low pressure up to 200 kPa.
  • Use sprayers with Viton seals to prevent damage from the diesel carrier.
  • Wet all stems on multi-stemmed varieties. No stem should be missed, or regrowth will occur.
  • For rough-barked species, apply more thoroughly than smooth-barked species.
  • Delay treatment of bulldozed or ploughed regrowth until plants reach at least 1 metre height.

Protection of Crops, Native and Other Non-Target Plants:

  • Treat target weeds only. Do not allow the mixture to contact non-target species.
  • Legumes, vines, vegetables, cotton, tomatoes, ornamentals, conifers, and many broadleaf plants are highly susceptible during both growing and dormant periods.
  • Picloram can persist in the soil for extended periods. Do NOT move sprayed soil to areas where desirable plants are grown.
  • Do not apply where surface runoff may reach susceptible crops or plants.
  • Use of Access on native vegetation must comply with relevant state and local legislation.

Protection of Livestock, Wildlife, Fish, Crustaceans and the Environment:

  • Do not contaminate streams, rivers, or waterways with the chemical or used containers.
  • Alongside waterways, treat noxious weeds and poisonous plants only.

Resistant Weeds Warning:

  • Access Herbicide is a Group I Herbicide (Pyridines). Repeated use may allow resistant biotypes to dominate. Contact your agronomist or local Corteva representative for resistance management strategies.

Storage:

  • Store in the original closed container in a cool, well-ventilated area.
  • Do not store in direct sunlight for prolonged periods.
  • Do not store near food, feedstuffs, fertilisers, or seed.
  • Store locked up. Combustible liquid. Keep away from flames and hot surfaces.

Safety Directions:

  • Harmful if swallowed. Irritates eyes, nose, throat, and skin. Repeated exposure may cause allergic disorders.
  • Avoid contact with eyes and skin. Avoid inhaling vapour or spray mist.
  • Wear cotton overalls buttoned to the neck and wrists, a washable hat, elbow-length neoprene gloves, and a face shield or goggles when opening, mixing, and applying.
  • Wash hands, arms, and face with soap and water after use and before eating, drinking, or smoking.
  • Wash gloves, face shield or goggles, and contaminated clothing after each day’s use.
  • It may be fatal if swallowed and enters the airways. Do not induce vomiting.

First Aid:

  • If poisoning occurs, contact a doctor or the Poisons Information Centre. Phone Australia 131 126.
  • For further information, refer to the Safety Data Sheet (SDS).

This information and product advice are not intended as advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Withholding Period

Withholding Period Details (WHP): 

  • Not applicable when used as directed.
  • The use pattern of this product is such that no withholding periods are required.

SDS & Technical

Access Herbicide Label (APVMA) Download Pdf
Access Herbicide Label Download Pdf
Access Herbicide SDS Download Pdf
Access Herbicide Technical Manual Download Pdf
Corteva Woody Weed Control Guide Download Pdf

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