Colt

Manufacturer
ADAMA
Category
Herbicides
Registered until
2024-06-30
Registration number
63316
Active materials
Links

GROUP CF HERBICIDE

For the control of certain broadleaf weeds in winter cereals and pasture as specified in the Directions for Use table.

DIRECTIONS FOR USE
Restraints:
DO NOT apply if crop or weeds are stressed due to dry or excessively moist conditions.
DO NOT apply to crops under stress due to disease or insect damage.
DO NOT apply to frost-affected crops or if frosts are imminent.
DO NOT apply if heavy rain is expected within 4 hours.
DO NOT apply with crop oils (cereals only).

WHEAT, BARLEY, TRITICALE, CEREAL RYE
((including undersown with clover and/or lucerne), and these cover crops in vineyards)
PASTURE
(Clover and/ or Lucerne based pasture (newly sown or established) including cover crops in vineyards)
Weeds controlled: Wild Radish
Weed stage: Up to 2 leaf stage and not more than 60 mm in diameter and where weed density is less than 50 plants/m2
Rate / ha: 350 mL
State: WA only

Weeds controlled: Wild Mustard, Wild Radish
Weed stage: Up to 4 leaf stage and not more than 120 mm in diameter
Rate / ha: 500 mL
State: All States
Weed stage: Up to 6 leaf stage and not more than 150 mm in diameter
Rate / ha: 750 mL
State: All States
Weed stage: Up to 8 leaf stage and not more than 180 mm in diameter
Rate / ha: 1.0 L
State: All States

Weeds controlled: Canola (Rapeseed), Charlock, Turnip Weed, Wild Turnip
Weed stage: Up to 2 leaf stage and not more than 60 mm in diameter
Rate / ha: 500 mL
State: All States
Weed stage: Up to 4 leaf stage and not more than 120 mm in diameter
Rate / ha: 750 mL
State: All States

Weeds controlled: Shepherd’s Purse
Weed stage: Up to 4 leaf stage and not more than 120 mm in diameter
Rate / ha: 1.0 L
State: All States

Weeds controlled: Capeweed
Weed stage: Up to 4 leaf stage and not more than 120 mm in diameter
Rate / ha: 500 mL
State: All States
Weed stage: Up to 6 leaf stage and not more than 150 mm in diameter
Rate / ha: 750 mL
State: All States
Weed stage: Up to 8 leaf stage and not more than 180 mm in diameter
Rate / ha: 1.0 L
State: All States

Weeds controlled: Corn Gromwell
Weed stage: Up to 4 leaf stage
Rate / ha: 500 mL
State: All States
Weed stage: Up to 6 leaf stage
Rate / ha: 750 mL
State: All States

Weeds controlled: Climbing Buckwheat
Weed stage: Up to 2 leaf stage
Rate / ha: 500 mL
State: All States
Weed stage: Up to 4 leaf stage
Rate / ha: 750 mL
State: All States
Weed stage: Up to 6 leaf stage
Rate / ha: 1.0 L
State: All States

Weeds controlled: Deadnettle, Paterson’s Curse (Salvation Jane), Rough Poppy
Weed stage: Up to 2 leaf stage
Rate / ha: 500 mL
State: All States
Weed stage: Up to 4 leaf stage
Rate / ha: 750 mL
State: All States

Weeds controlled: Amsinckia
Weed stage: Up to 4 leaf stage
Rate / ha: 750 mL
State: All States

Weeds controlled: Doublegee (Spiny Emex)
Weed stage: Up to 2 leaf stage
Rate / ha: 500 mL
State: Qld, NSW, ACT, Vic, Tas, WA only
Weed stage: Up to 4 leaf stage
Rate / ha: 750 mL
State: All States

Weeds controlled: Chamomile, Common Peppercress, Lesser Swinecress, Purple Calandrinia (Mountain Sorrel), Tree Hogweed
Weed stage: Up to 4 leaf stage
Rate / ha: 1.1 L
State: All States

Weeds controlled: Fat Hen, Field Madder, Saffron Thistle, Variegated Thistle
Weed stage: Up to 4 leaf stage
Rate / ha: 1.0 L
State: All States

Weeds controlled: Ox-Tongue, Wireweed
Weed stage: Up to 2 leaf stage
Rate / ha: 1.0 L
State: All States

Weeds controlled: Fireweed
Weed stage: Up to 4 leaf stage
Rate / ha: 500 mL
State: Qld, NSW, ACT, Vic, SA, WA, NT only

Weeds controlled: Common Cotula (Bird’s Eye), Pheasants Eye (Adonis)
Weed stage: Up to 4 leaf stage
Rate / ha: 560 mL
State: SA only
Weed stage: Greater than 4 leaf stage
Rate / ha: 1.1 L
State: SA only

WHEAT, BARLEY, TRITICALE, CEREAL RYE
Weeds controlled: Fumitory
Weed stage: 2-6 leaf stage
Rate / ha: 350 + 200 mL/ha terbutryn (500 g/L)
State: WA only

Critical comments: CROP STAGE
Cereals
2 leaf to fully tillered (Zadok’s Z12-29). Optimum results are achieved when sprayed at 4-8 weeks post-sowing.
Warning: COLT may cause transient crop yellowing of cereals. (Refer to “Crop Tolerance” section of General Instructions).
Clover and lucerne
Application is recommended prior to the 8th trifoliate leaf stage. Application can be made from the 1st trifoliate leaf stage in Qld, NSW, ACT and Vic only. In other States applications prior to the 3 leaf stage may result in crop damage if seedlings are under stress and in sandy soils. DO NOT apply to annual medics.
Warning: COLT may affect growth and seed set of some varieties of clover and lucerne (Refer to “Crop Tolerance” section of General Instructions).
Cover Crops in Vineyards: When using in vineyard situations, apply during vine dormancy only. Contact with vines must be avoided. Particular care should be taken if applied in late Autumn or early Spring, when vines may not be fully dormant.
Weed Stage: Apply from early post-emergence.
Application: Apply when weeds are actively growing.
Ensure thorough coverage of weeds. Where crop or weed density is high, increase water volume. In most situations the rate specified for each weed size will give satisfactory control. However, under certain conditions such as:
- high crop and weed density;
- late season germinations;
- abnormal weed growth (including early flowering); higher rates of product (up to the maximum rate of application specified for that weed) may be required.
COLT will not effectively control:
- regrowth of suppressed weeds;
- transplanted weeds;
- regrowth from rhizomes or roots;
- weeds growing under stress from previous herbicide applications;
- radish plants beyond rosette stage.
Wild Radish: Effective residual activity of this product may be reduced where:
- rates lower than 1.0 L/ha are used;
- dry conditions prevail;
- poor coverage of the soil surface is achieved;
- crop is grown in non-wetting sand;
- soils have a high content of clay or organic matter.
Volunteer Lupins: In some situations, the higher rate of 1.0 L/ha may be required to effectively suppress volunteer lupins at the 4 leaf stage.
- COLT will suppress seedling dock but will not suppress regrowth from transplanted roots.

WHEAT, BARLEY, TRITICALE, CEREAL RYE
((including undersown with clover and/or lucerne), and these cover crops in vineyards)
PASTURE
(Clover and/ or Lucerne based pasture (newly sown or established) including cover crops in vineyards)
Weeds controlled (Suppression of): Dense-flower Fumitory
Weed stage: Up to 2 leaf stage
Rate / ha: 750 mL
State: All States

Weeds controlled (Suppression of): Chickweed, Common Sowthistle (Milk Thistle), Dock, Hexham Scent (King Island Melilot), Prickly Lettuce, Scarlet Pimpernel, Skeleton Weed, Sorrel, Speedwell, Three- Horned Bedstraw, Toad Rush
Weed stage: Up to 4 leaf stage
Rate / ha: 1.0 L
State: All States

Weeds controlled (Suppression of): Volunteer Lupins
Weed stage: Up to 4 leaf stage
Rate / ha: 500 mL-1.0 L
State: All States

Weeds controlled (Suppression of): Crassula (Stonecrop)
Weed stage: Up to 5 leaf stage
Rate / ha: 500 mL
State: All States

Weeds controlled (Suppression of): Long Storksbill
Weed stage: Up to 4 leaf stage
Rate / ha: 500 mL
State: All States

Weeds controlled (Suppression of): Volunteer Field Peas
Weed stage: Up to 5 node stage
Rate / ha: 750 mL
State: All States

Weeds controlled (Suppression of): Ward’s Weed
Weed stage: Up to 5 leaf stage
Rate / ha: 1.0 L
State: All States

Weeds controlled (Suppression of): Vetch
Weed stage: Up to 2 leaf stage
Rate / ha: 1.0 L
State: All States

Weeds controlled (Suppression of): Mouse-Eared Chickweed
Weed stage: Up to 2 leaf stage
Rate / ha: 1.0 L
State: NSW, ACT only

Weeds controlled (Suppression of): Mexican Poppy
Weed stage: Up to 2 leaf stage
Rate / ha: 1.0 L
State: Qld only

Weeds controlled (Suppression of): Mintweed, Spoon Cudweed
Weed stage: Up to 4 leaf stage
Rate / ha: 1.0 L
State: NSW, ACT only

Weeds controlled (Suppression of): New Zealand Spinach
Weed stage: Up to 2 leaf stage
Rate / ha: 750 mL
State: Qld only

Weeds controlled (Suppression of): Cleavers
Weed stage: Up to 1 whorl stage
Rate / ha: 1.0 L
State: SA only

Weeds controlled (Suppression of): Ball Mustard
Weed stage: Up to 4 leaf stage
Rate / ha: 1.0 L
State: SA only

Weeds controlled (Suppression of): Horehound
Weed stage: Pre-emergence
Rate / ha: 1.0 L
State: SA only

Weeds controlled (Suppression of): Marshmallow
Weed stage: Up to 2 leaf stage
Rate / ha: 1.0 L
State: SA only

Critical comments: CROP STAGE
Cereals
2 leaf to fully tillered (Zadok’s Z12-29). Optimum results are achieved when sprayed at 4-8 weeks post-sowing.
Warning: COLT may cause transient crop yellowing of cereals. (Refer to “Crop Tolerance section of General Instructions).
Clover and lucerne
Application is recommended prior to the 8th trifoliate leaf stage. Application can be made from the 1st trifoliate leaf stage in Qld, NSW, ACT and Vic only. In other States applications prior to the 3 leaf stage may result in crop damage if seedlings are under stress and in sandy soils.
DO NOT apply to annual medics.
Warning: COLT may affect growth and seed set of some varieties of clover and lucerne (Refer to “Crop Tolerance” section of General Instructions).
Cover Crops in Vineyards: When using in vineyard situations, apply during vine dormancy only. Contact
with vines must be avoided. Particular care should be taken if applied in late autumn or early spring, when vines may not be fully dormant.
Weed Stage: Apply from early post-emergence.
Application: Apply when weeds are actively growing.
Ensure thorough coverage of weeds. Where crop or weed density is high, increase water volume. In most situations the rate specified for each weed size will give satisfactory control. However, under certain conditions such as:
- high crop and weed density;
- late season germinations;
- abnormal weed growth (including early flowering); higher rates of product (up to the maximum rate of application specified for that weed) may be required.
COLT will not effectively control:
- regrowth of suppressed weeds;
- transplanted weeds;
- regrowth from rhizomes or roots;
- weeds growing under stress from previous herbicide applications;
- radish plants beyond rosette stage.
Wild Radish: Effective residual activity of this product may be reduced where:
- rates lower than 1.0 L/ha are used;
- dry conditions prevail;
- poor coverage of the soil surface is achieved;
- crop is grown in non-wetting sand;
- soils have a high content of clay or organic matter.
Volunteer Lupins: In some situations, the higher rate of 1.0 L/ha may be required to effectively suppress volunteer lupins at the 4 leaf stage.
- COLT will suppress seedling dock but will not suppress regrowth from transplanted roots.

WHEAT, BARLEY, TRITICALE, CEREAL RYE
Weeds controlled (Suppression of): Wild Radish
Weed stage: Up to the 4 leaf stage and not more than 120 mm in diameter
Rate / ha: 350 mL plus 200 mL MCPA LVE (500 g/L)
State: WA onlyWeed stage:
Up to the 6 leaf stage and not more than 150 mm in diameter
Rate / ha: 500 mL plus 200 mL MCPA LVE (500 g/L)
State: All States
Weed stage: Up to the 8 leaf stage and not more than 180 mm in diameter
Rate / ha: 500 mL plus 400 mL MCPA LVE (500 g/L)
State: All States

Critical comments: Refer also to all Critical Comments for cereals above.
DO NOT use this tank-mix if cereals are undersown with lucerne or annual medics.
DO NOT use this tank-mix in vineyards.
Crop Stage
COLT 350 mL + MCPA LVE 200 mL: Apply from 3 leaf to fully tillered (Zadok’s Z13 to Z30).
COLT 500 mL + MCPA LVE 200 mL: Apply from 3 leaf to fully tillered (Zadok’s Z13 to Z30).
COLT 500 mL + MCPA LVE 400 mL: Apply from 5 leaf stage to fully tillered (Zadok’s Z15 to Z30).
Optimum results are achieved when sprayed at 4-8 weeks post sowing.
Warning: COLT may cause transient crop yellowing of cereals. (Refer to “Crop Tolerance” section of General Instructions).
Observe instructions also on MCPA LVE product label.

NOT TO BE USED FOR ANY PURPOSE OR IN ANY MANNER CONTRARY TO THIS LABEL UNLESS AUTHORISED UNDER APPROPRIATE LEGISLATION.

WITHHOLDING PERIODS:
Harvest: CEREALS, GRAPES – NOT REQUIRED WHEN USED AS DIRECTED.
Grazing: PASTURE, CEREALS – DO NOT GRAZE OR CUT FOR STOCK FOOD WITHIN 14 DAYS AFTER APPLICATION.

GENERAL INSTRUCTIONS
This product is a post-emergence contact herbicide, which may provide residual control of wild radish up to 4 weeks after application.
- Apply COLT immediately after mixing. DO NOT allow to stand in the spray tank overnight.
- Optimum results will be obtained if good soil moisture exists at and after application and weeds are not stressed.
- Some pre-emergence herbicides, such as atrazine, can cause stress to certain crops resulting in an increase in crop damage when using this product. Crops which are particularly sensitive are lucerne and subterranean clover.

RESISTANT WEEDS WARNING
COLT Herbicide is a member of the nitrile and nicotinanilide groups of herbicides. COLT is an inhibitor of photosynthesis at photosystem II and carotenoid biosynthesis. For weed resistance management, COLT is a Group C, F herbicide. Some naturally occurring weed biotypes resistant to COLT and other Group C, F herbicides may exist through normal genetic variability in any weed population. The resistant individuals can eventually dominate the weed population if these herbicides are used repeatedly. These resistant weeds will not be controlled by COLT or other Group C, F herbicides.
Since the occurrence of resistant weeds is difficult to detect prior to use, Adama Australia Pty. Ltd. accepts no liability for any losses that may result from the failure of COLT to control resistant weeds.

TEMPERATURE WARNING
DO NOT apply COLT if frosts are imminent. Frost causes stress on crops and weeds and could result in increased crop effects and/or decreased weed control. To ensure good results COLT should only be applied once the weeds and crop are no longer under stress from the frost conditions. Avoid application when maximum daily temperatures above 20 C occur, or are likely to occur for a few days after application, as increased crop damage may result.

CROP TOLERANCE
Cereals
After application some transient crop yellowing may occur. This usually appears as yellow or white banding on leaves. Provided the crop is not under stress from pre-emergent herbicide, root disease, insect damage, frost, dry or excessively moist conditions, the development of the crop and subsequent growth will be unaffected.

Lucerne
Warning: The tolerance of lucerne varieties to COLT can vary with rate of application, soil type, crop health, stage of growth and degree of moisture and temperature stress. COLT may result in transient crop yellowing and suppression of growth with a resultant initial reduction in dry matter. For this reason we recommend application prior to the 8 trifoliate leaf stage.
However, under normal growing conditions subsequent growth and seed yield should not be affected. Crop damage may be increased if rates higher than 500 mL/ha are used and in areas where spray overlapping has occurred.
Under normal growing conditions, the following lucerne varieties have shown acceptable levels of foliage tolerance to COLT  pplied at 500 mL/ha: Hunter River, Nova and Dekalb 185. Varieties not listed should be tested before using COLT over large areas.
Consult your local Adama representative for advice on specific varieties.

Subterranean clover
Warning: The tolerance of Subterranean Clover varieties to COLT can vary with rate of application, soil type, crop health, stage of growth and degree of moisture and temperature stress. COLT may result in transient crop yellowing and suppression of growth with an initial reduction in dry matter. For this reason we recommend application prior to the 8 trifoliate leaf stage.
However, under normal growing conditions subsequent growth and seed yield should not be affected. Crop damage may be increased if rates higher than 500 mL/ha are used and in areas where spray overlapping has occurred.
Under normal growing conditions, the following varieties have shown acceptable levels of foliage tolerance to COLT applied at 500 mL/ha: Daliak, Dalkeith, Denmark, Goulburn, Karridale, Leura, Mt. Barker, Nungarin, Rosedale, Seaton Park, Trikkala and Woogenellup.
The variety Junee has shown increased sensitivity to COLT so care should be taken if this variety is part of the pasture sward.
The effects of COLT on Subterranean Clover seed yield have been tested on the following varieties. Under normal growing conditions they show acceptable levels of tolerance to COLT applied at 500 mL/ha.
However, higher rates may reduce seed yield under conditions of low weed pressure: Denmark, Goulburn, Larissa, Nungarin, Seaton Park, Trikkala and Woogenellup.
Varieties not listed should be tested before using COLT over large areas. Consult your local Adama representative for advice on specific varieties.

Other Clovers
Warning: The tolerance of clover varieties to COLT can vary with rate of application, soil type, crop health, stage of growth and degree of moisture and temperature stress. COLT may result in transient crop yellowing and suppression of growth with a resultant initial reduction in dry matter. For this reason we recommend application prior to the 8 trifoliate leaf stage.
However, under normal growing conditions subsequent growth and seed yield should not be affected. Crop damage may be increased if rates higher than 500 mL/ha are used and in areas where spray overlapping has occurred. The effect on seed yield of other clovers has not been determined.
The following varieties of clover have shown increased sensitivity to COLT: Big Bee, Sacromonte (Berseem), Haifa (White), Zulu (Arrowleaf), Kyambro, Lupers and Maral (Persian).
Care should be exercised if these clovers are part of the pasture sward. Varieties not listed should be tested before using COLT over large areas. Consult your local Adama representative for advice on specific varieties.

Subsequent Crops
To reduce effect on subsequent susceptible crops (e.g. canola), ensure thorough cultivation of soil prior to the sowing of these crops.

MIXING
To ensure even mixing, half fill the spray tank with clean water and add the required amount of product. Agitate thoroughly while carrying out spray operations. Reseal part-used container immediately after use.

APPLICATION
Boom Sprayer: A minimum of 50 L water/ha should be used, however, for optimum results water rates of 70-100 L/ha are recommended. Increase the water volume where weed infestation is heavy or the crop cover is dense.
Complete coverage of weeds is essential. Higher water volumes (up to 100 L/ha) will ensure faster activity of the product on the weeds but may increase the symptoms of crop damage.
The following settings are examples which will ensure excellent coverage of exposed weeds:

Water Rate: 50 L/ha
Nozzle: Hardi No. 10 or equivalent
Speed: 10 km/h
Pressure: 240 kPa (2.4 bar)

Water Rate: 75 L/ha
Nozzle: Hardi No. 12 or equivalent
Speed: 10 km/h
Pressure: 220 kPa (2.2 bar)

Water Rate: 75 L/ha
Nozzle: Hardi No. 14 or equivalent
Speed: 12 km/h
Pressure: 210 kPa (2.1 bar)

Controlled Droplet Application (CDA)
Insufficient information is available to recommend the application of this product by CDA.
Warning: The rubber components present in some spraying units may be affected by exposure to the solvents in COLT. To reduce this risk it is recommended that the spray unit be thoroughly washed with a boom cleaner and fresh water after use.
Aircraft: Insufficient information is available to recommend the application of this product by air.

COMPATIBILITY
The following herbicide products are physically compatible with COLT as two-way mixtures in the spray tank, but should only be used for the crops specified, and only when the crop is also specified on the label of the compatible product (See below for list of compatibile insecticides):

Crop: Wheat, Triticale, Cereal Rye (including undersown)
COLT: Up to 750 mL/ha
Compatible Product: Rhino (Barley also), Puma Progress (Wild Oats only, high rate), Wildcat 110 EC (Wild Oats only, high rate)

Crop: Wheat, Barley, Triticale, Cereal Rye (including undersown)
COLT: All rates
Compatible Product: Broadstrike

Crop: Wheat, Barley, Triticale, Cereal Rye (not undersown)
COLT: Up to 500 mL/ha
Compatible Product: Lynx WG, Tackle WG, MCPA LVE (500 g/L product) (up to 500 mL/ha only)

COLT: All rates
Compatible Product: 2,4-D amine 500, Eclipse, Cadence (up to 115 g only), Lontrel

Crop: Wheat only (not undersown)
COLT: All rates
Compatible Product: Mandate

Crop: Established Lucerne only
COLT: Up to 750 mL/ha
Compatible Product: Simazine (500 g/L product) (up to 1.25 L/ha only) and simazine (500 g/L)/paraquat (200 g/L) mixture

Crop: Newly sown and established Lucerne and Clover only
COLT: Up to 750 mL/ha
Compatible Product: Leopard, Fusilade, 2,4-DB amine (500 g/L)

COLT: Up to 1.0 L/ha
Compatible Product: Broadstrike

When mixing COLT with other herbicides, crop yellowing may be enhanced.
When mixing with Rhino, Wildcat 110 EC or Puma Progress some reduction in the efficacy and speed of action of these products may occur.
When mixing with Leopard or Fusilade some reduction in the efficacy and speed of action of these products and COLT may occur.
In tank-mixtures with Lynx WG and Tackle WG, rates of COLT higher than 500 mL/ha may cause significant crop damage.
If the crop is stressed, the application of the herbicide tank-mixtures may cause yield reduction.
When mixing with Cadence a temporary wilting may be evident in some crops after application.
The mixture of COLT and simazine should be applied during winter to lucerne which is not actively growing. This mixture may result in an increased crop effect but this can be reduced if the lucerne is grazed or cut before spraying.
DO NOT mix COLT with Verdict.
Growers should seek advice before spraying recently released cereal varieties.
This product may be mixed in the spray tank with one of the following insecticides according to the directions for the insecticide product:  Chlorpyrifos (500 g/L product), Ballistic Elite, dimethoate, Alpha-Scud, Fastac Duo, Le-mat 290 SL, Venom and Thiodan.
Use the recommended rates for COLT and its tank-mix partner as well as the surfactant recommendation of the tankmix partner. Read the label of the tank-mix partner before mixing and using the tank mixture. If another herbicide is applied as a tank mix, observe the plantback restrictions on that label.
Warning: DO NOT use crop oils with COLT or COLT tank mixtures in cereals.
As formulations of other manufacturers’ products are beyond the control of Adama, all mixtures should be tested prior to mixing commercial quantities

Registered for culturesRate
Pasture0.35 - 1.1 l
Winter wheat0.35 - 1.1 l
Spring wheat0.35 - 1.1 l
Spring barley0.35 - 1.1 l
Winter barley0.35 - 1.1 l
Winter triticale0.35 - 1.1 l
Spring triticale0.35 - 1.1 l
Winter rye0.35 - 1.1 l