Atrazine 500 20L (Herbicide)

Atrazine 500 is a residual Herbicide for the control of Fathen, Black Nightshade, Willow Weed and other Broadleaf Weeds in Maize, Sweetcorn, Linseed and established Lucerne. Highly effective Herbicide for Pre-emergence or Post-emergence Broadleaf Weed control.
Active Ingredient:
900 g/L Atrazine in the form of a Water Dispersible Granule.
How It Works:
“Flowable Atrazine 500 is absorbed through leaves and roots and acts best on young Weeds as a post-emergence spray.” Flowable Atrazine 500 blocks photosynthesis and susceptible Weeds stop growing and die. It works best on small actively growing Weeds.
What It Controls: (Controls Many).
- Broadleaf Weeds.
- Seedling Annual Grasses.
Common Examples:
- Fathen.
- Black Nightshade.
- Willow Weed.
- Redroot Amaranth.
- Apple of Peru.
Some Grass Suppression/Control:
- Summer Grass.
- Annual Grasses (especially in tank mixes).
- Resistant Fathen populations are known to exist.
Where It’s Used: (Registered Uses Include).
- Maize.
- Sweetcorn.
- Linseed.
- Established lucerne.
Not Suitable For:
- Lawns.
- Gardens.
- General Pasture Weed Control.
Pre-emergence vs post-emergence:
Flowable Atrazine 500 can be used:
- Before Weeds emerge (pre-emergence).
- Shortly after Weeds emerge (early post-emergence).
The Label Especially Recommends:
- Early post-emergence.
- Weeds under 2 cm tall.
Moisture Is Critical:(The Label Strongly Stresses).
“Moisture in the soil surface is essential for good results.”.
- Without rainfall or soil moisture weed control drops significantly.
Application Rates: (General Examples).
Maize & Sweetcorn:
Typical Rates:
- 1.5–3.0 L/ha depending on Weeds and tank mix.
Water Rates:
- 200–400 L water/ha.
Linseed:
- Around 800 mL/ha in mixes.
Lucerne:
- 1.5–2.0 L/ha plus Paraquat for winter dormant Weed control.
Tank Mixing: (The Label Says It Is Commonly Mixed With).
- Grass Herbicides.
- Paraquat Products.
- Other Broadleaf Herbicides.
Examples Mentioned:
- Roustabout®.
- Agritone®.
- Bonza® Wetting Agent.
- NOT compatible with Gramoxone® 250.
Crop Rotation Restrictions:(Very Important Label Warning)
Flowable Atrazine 500 residues can damage sensitive follow-on Crops including:
- Tomatoes.
- Cucurbits.
- Brassicas.
- Lettuce.
- Beetroot.
- Beans.
Flowable Atrazine 500 can persist in soil for months.
Spray Drift Warning:(The Label Repeatedly Warns)
“Spray drift may cause serious damage to other desirable Plants.”
Avoid Spraying:
- In wind.
- Near Gardens.
- Near Waterways.
Safety & Hazards:(Hazards Listed On Label/SDS)
- Harmful if swallowed.
- May damage kidneys through repeated exposure.
- Very toxic to aquatic life.
- Toxic to soil organisms and wildlife.
PPE Required:(The Label Requires)
- Waterproof gloves.
- Overalls.
- Boots.
- Avoid inhaling spray mist.
Resistance Management:
Flowable Atrazine 500 is a Group 5 Herbicide.
The label warns resistant Weeds already exist, including:
- Fathen.
- Willow Weed.
- Repeated use alone increases resistance risk.
Key Mistakes To Avoid:
- Spraying large Weeds, best on very young weeds.
- Dry soil conditions, needs moisture to activate.
- Spray overlaps can injure crop.
- Ignoring residual carryover Can damage future crops.
- Repeated solo use Increases resistance pressure.
Bottom Line:
Flowable Atrazine 500 Is:
- A classic Maize Herbicide.
- Strong on Broadleaf Weeds.
- Useful both pre- and early post-emergence.
- Long-lasting in soil.
- Moisture-dependent.
But:
- It carries environmental persistence risks.
- Requires careful crop rotation planning.
- Resistance management matters.
Caution:
Use strictly according to label directions.

Available in 20L, 200L, 1000L.

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