Coliseum Herbicide

For the Control of Winter Grass (Poa annua) and Ryegrass (Lolium spp.) in Common Couch and Hybrid Couch Turf

Coliseum Herbicide (active constituent rimsulfuron) is registered for the control of Wintergrass (Poa annua) & Ryegrass (Lolium spp) in Couch & Hybrid Couch.

Coliseum Herbicide allows turf managers to control the various genotypes of Wintergrass & Ryegrass that other herbicides have struggled to manage, and has shown to be user friendly compared to other herbicides in the sulfonylurea family.

Coliseum Herbicide has very good root uptake and can be washed in just one hour after application, which greatly reduces the chance of tracking and damage to non-target areas. Irrigation should be applied prior to foot traffic the following morning as sulfonylureas can reactivate with heavy dews. The irrigation cycles are short to ensure the product is washed off the leave and to enhance root uptake.

Coliseum Herbicide also has a short soil life of three to seven days, allowing re-seeding seven to ten days after application. This is ideal if overseeding of tees or sports fields is required for assistance with winter wear.

Features and Benefits

  • Outstanding post emergent control of Winter Grass & Ryegrass
  • Excellent Turf Tolerance on Common & Hybrid Couches
  • Flexibility to over-sow 10 days after an application
  • Does not delay couch spring green-up when applied during dormancy compared to trifloxysulfuron
  • Does not reduce cell elongation & growth compared to trifloxysulfron
  • Control of Winter Grass & Ryegrass on newly planted couch as early as 5 weeks after planting or seeding, with no phototoxicity or long-term retardation of growth  (Note: root depth of the couch at the 5 week stage was measured at 5 cm at the time of application as per label instructions)

Active Constituent

  • 250 g/kg RIMSULFURON

Activity Group

  • Group B Herbicide


  • WDG - Water Dispersible Granule

Pack Sizes

  • 25g  
  • 100g  
  • 1kg  


Where to Buy

Go to our Where to Buy page