SEMPRA HERBICIDE NUTGRASS KILLER NUFARM
- Active ingredient
- Metolachlor
- Controls
- Sempra Herbicide Nutgrass Killer is specifically formulated to control nutgrass (Cyperus rotundus), one of the most persistent and difficult-to-control weeds in Austra...
Nufarm Sempra 100g
For the selective, post-emergence control of nutgrass in sugarcane, corn or maize and sorghum and for the selective post emergence control of nutgrass and Mullumbimby couch in turf.
Also controls nutgrass in cotton using shielded sprayers.
Application When to Spray:
Nutgrass:
Apply when new leaf growth is greater than 5cm
Mullumbimby Couch:
Apply when new leaf growth is greater than 2cm
Apply when weeds are actively growing
Apply follow -up treatments as required if sufficient new growth warrants treatment Weed Control Symptoms
Weed foliage gradually turn yellow until total desiccation occurs
Initial symptoms appear in 7 - 10 days with full weed control effects appearing over 4 to 6 weeks
Product Type:
Herbicide
Mode of Action:
Group B Herbicide
Active ingredient(s):
750g/kg Halosulfuron-methyl
Formulation:
Water Dispersible Granule
Active Ingredient: Metolachlor
Chemical Schedule: S6
Also sold as: Verdict, Goal, Basagran
Target Weeds
Sempra Herbicide Nutgrass Killer is specifically formulated to control nutgrass (Cyperus rotundus), one of the most persistent and difficult-to-control weeds in Australian agriculture. It also provides control or suppression of other troublesome sedge species including mullumbimby couch (Cyperus brevifolius) and certain other Cyperus spp. depending on the crop and use situation. The active ingredient, halosulfuron-methyl (note: always verify the active on the current label, as Sempra formulations have varied), targets the growing points and underground tubers of nutgrass, providing both foliar and some systemic activity. Check the current registered label for the full list of controlled species and registered use situations.
Sempra Herbicide Nutgrass Killer is a selective post-emergent herbicide used primarily for the control of nutgrass (Cyperus rotundus) and other susceptible sedges in a range of crops and non-crop situations. Always read the product label and Safety Data Sheet (SDS) before use, as this is a Schedule 6 poison requiring careful handling.
Mix the required amount of Sempra in a partially filled spray tank, agitating thoroughly before topping up with water. A non-ionic surfactant or approved adjuvant is typically required to improve uptake — check the label for the recommended type and rate. Apply as a foliar spray to actively growing nutgrass plants, ensuring thorough coverage of the foliage. Application is most effective when nutgrass is at the 3–8 leaf stage and growing vigorously.
Avoid application if rain is expected within the withholding period specified on the label, as washoff will reduce efficacy. Do not apply during periods of drought stress, extreme heat, or when plants are not actively growing, as uptake and translocation will be reduced. Boom sprayers and knapsack sprayers are both suitable; calibrate equipment carefully before use.
Always observe label restraints regarding withholding periods, re-entry intervals, and buffer zones near waterways. This product is a Schedule 6 poison — wear full personal protective equipment (PPE) as directed on the label during mixing and application.
Always read the current registered product label before use. Dose rates and withholding periods on this page are provided as a guide only. The registered label supplied with the product is the legal document and takes precedence. If in doubt, contact TGRM on (07) 5482 1692 or the manufacturer directly.
Tips for Best Results
- Target actively growing plants: Apply when nutgrass is young and actively growing (3–8 leaf stage) for best translocation into tubers. Applications to stressed or dormant plants will give poor results, particularly during dry spells common in Queensland summers.
- Always use a surfactant: Nutgrass has a waxy leaf surface that resists water-based sprays. Including a quality non-ionic surfactant or the adjuvant specified on the label significantly improves absorption and overall control.
- Expect multiple applications: Nutgrass tuber banks are persistent. A single application rarely achieves full control — plan for follow-up treatments targeting new flushes of growth for season-long management.
- Resistance management: Rotate herbicide modes of action where possible and avoid relying solely on Sempra across consecutive seasons. Integrate cultural practices such as cultivation, competitive pasture or crop establishment, and hand removal to reduce tuber density over time.
- Safe storage and handling: As a Schedule 6 poison, store in the original container in a locked, clearly labelled chemical storage area away from children, livestock, feed, and water sources. Dispose of empty containers in accordance with label instructions and local council guidelines.
Always read the label and follow directions for use. The registered label is the legal document governing use of this product.
Download the Safety Data Sheet for this product:
Download SDS (PDF)Required for safe handling and storage. Keep on-site per WHS regulations.
Common Questions
What crops and weeds is Sempra Herbicide registered for?
Sempra is registered for selective, post-emergence control of nutgrass in sugarcane, corn, maize, sorghum and cotton (using shielded sprayers). It also controls nutgrass and Mullumbimby couch in turf.
How does Sempra work?
Sempra is a Group B herbicide that works by causing weed foliage to gradually turn yellow until the plant desiccates completely. Initial symptoms appear within 7–10 days, with full control effects over 4–6 weeks.
When should I apply Sempra?
Sempra should be applied when weeds are actively growing. The product label specifies the exact timing based on new leaf growth—always read the registered label for precise application windows and any follow-up treatment requirements for your specific situation.
What form does Sempra come in?
Sempra is supplied as a Water Dispersible Granule formulation containing halosulfuron-methyl as the active ingredient.
Where can I find dosing, safety and mixing instructions?
All dosage rates, dilution ratios, withholding periods, re-treatment intervals and safety directions are detailed on the registered product label and Safety Data Sheet (SDS). Always read these carefully before use. If you have questions, contact TGRM on (07) 5482 1692, visit us at 55 Tozer St, Gympie, or consult your agronomist or veterinarian.
Do you ship this product Australia-wide?
Yes, this product ships Australia-wide via Australia Post or road courier. Select your preferred shipping method at checkout.
Mainland Australia only — we cannot deliver this product to Tasmania. It is classified as environmentally hazardous (harmful to aquatic life), which means it cannot be carried by sea or air freight. Tasmania and other offshore destinations can only be reached by a sea or air leg, so we are unable to send it there. It travels by road freight to mainland addresses as normal. Call us on (07) 5482 1692 if you are unsure about your address.
Can you deliver this to Tasmania?
No. This product is environmentally hazardous (harmful to aquatic life) and cannot legally be carried on sea or air freight. Because every route to Tasmania involves a sea or air crossing, we can only deliver it within mainland Australia. If you are in Tasmania, please call us on (07) 5482 1692 and we will help you find an alternative product.
Can I Click & Collect from Gympie?
Yes — Click & Collect is available from our store at 55 Tozer St, Gympie. Open Mon–Fri 8am–5pm and Sat 8am–12pm. Click & Collect is FREE on orders of $175 or more, or a flat $10 on orders under $175. Select Click & Collect at checkout and we will have your order ready.
