Monument Liquid Turf Herbicide (Trifloxysulfuron)

A couple of important points here.

First, "high cut" and "low cut" on the Monument Liquid label refer to the height the turf is being mowed at, not the density or severity of the weed infestation. Low cut means turf maintained below approximately 15mm (e.g., golf fairways, bowling greens, intensively managed hybrid couch). High cut means turf maintained above 15mm — which covers the vast majority of home and park couch lawns. A standard home couch lawn is almost always in the high cut category.

The reason the water volume changes with cut height is canopy penetration. Taller, denser turf needs more water volume to carry the product down into the crowns and achieve even coverage. The amount of product per hectare stays the same — only the water volume changes. So, high cut is not a doubled product rate; it's the same product diluted into more water, which is why the concentration per litre is lower (0.28mL/L) than for low cut (0.56mL/L).

For your home couch lawn, high cut applies — use 0.28mL per litre of water.

Second, it's worth noting that Monument Liquid is registered for suppression only of kikuyu, not full control. Kikuyu is a persistent, deep-rooted grass, and Monument will set it back rather than eliminate it. Two applications 21–28 days apart are required, with the best results achieved from autumn applications.

Third, the Monument Liquid label specifies boom spray as the registered application method. The existing Q&A on this page addresses hand spraying in detail — in short, it is an off-label application method, and the outcome cannot be guaranteed, as even coverage is much harder to achieve with a hand sprayer. If you choose to proceed, you do so at your own risk, and we recommend contacting Syngenta Australia on 1800 022 035 for specific guidance.

You do not need to water in Monument Liquid Turf Herbicide, and you should wait at least 24 - 48 hours before any watering or irrigation. Please note the Monument application is only registered to be applied by boom spray application as it is very important to get an even disbursement of the chemical over the target area.  Often, with hand sprays, the application is much harder to spread evenly, resulting in higher than recommended rates being applied or spraying, causing damage and/or death of the host species. As a result, the outcome cannot be guaranteed. 

When using Monument Liquid Turf Herbicide, optimum performance will be achieved if you avoid mowing for 1 to 2 days before and following application. Monument Liquid Turf Herbicide contains 100 g/L trifloxysulfuron sodium, a member of the sulfonylurea herbicides.  Sulfonylureas are slow-acting herbicides, so the longer you can put off irrigation, the more time you will allow translocation to occur.  Waiting at least 24-48 hours should be fine before irrigation. 

The application of the Monument is only registered to be applied by boom spray application as it is very important to get an even disbursement of the chemical over the target area.  Often with hand sprays, the application is much harder to spread evenly resulting in higher than recommended rates being applied or over spraying causing damage and/or death of the host species.  

If you choose to go 'off-label', it is at your risk.  The general mixing rate of Monument Herbicide for winter grass control is 225mL per 10,000m².  This equates to 2.25mL of the chemical being applied evenly over a 100m² area. 

There are also other factors to take into consideration such as the height of the turf you are spraying (ie high or low cut) and the water volume required for penetration of the chemical.

For lower cut turf the recommended water rate per Ha is 400L, which equates to 1L per 25m².  So ff the mixing rate is 225mL/400L, then the per L mixing rate of Monument is 0.56mL per 1L.

For higher cut turf the recommended water rate per Ha is is 800L, which equates to 1L per 12.5m².  So if the mixing rate of Monument is 225mL/800L, the per L mixing rate is 0.28mL per 1L.

If you are unsure about the application of Monument Herbicide we recommend you speak with the manufacturer, Syngenta Australia on 1800 022 035

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.​