Herbicide Recommendations for Turfgrass: Postemergence Grass Herbicides

Table of Contents

1. Introduction
2. Acclaim Super
3. Dimension
4. Turfgrass Herbicide Rating Table (Table 17-1) (PDF 15k)
5. Other Turfgrass Weed Control Recommendations
   • Site Preparation Before Turfgrass Establishment
   • Preemergence Grass Herbicides
   • Inhibitors of Smooth Crabgrass and Dandelion Seed Germination
   • Postemergence Broadleaf Herbicides
   • Turfgrass Renovation
   • Turfgrass Retardation
6. Related Links

Introduction

Postemergence - Leaf stage of the weeds is critical for good weed control. Smaller weeds are generally easier to kill but there needs to be enough leaf surface to intercept the herbicide. Apply according to recommended leaf stages. Crop stage is important to optimize crop safety. Always use appropriate drift management technology.

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Precautions

• POST - For the control of crabgrass at the 1-4 leaf up to the multi-tiller stage.
• Good coverage is essential to control multi-tillered or grassy weeds in the reproductive phase.
• Make a second application on mature monostands 21 days after first application.
• Do NOT apply to bentgrass or seedling Kentucky bluegrass.
• Do NOT tank-mix with any other herbicide or pesticide.
• Do NOT apply broadleaf herbicides 7 days before or after Acclaim Super.
• Do NOT apply during periods of drought stress.
• Do NOT mow grass for 4 days before or after application.
• Do NOT irrigate within 3 hr. after application.

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Precautions

• POST- For established turf until crabgrass reaches the 1-3 leaf stage before tillering. NOT recommended after 3-leaf stage. See PRE application.
• Use higher rate for larger plants or when area is heavily infested.
• Apply in 200-800 L/ha (80-160 L/ac) water.
• Allow turf to recover from aeration, or other stresses before application.
• Do NOT apply to putting greens during the first year of establishment.
• Check label for sensitive varieties, including Colonial bentgrasses.
• Do NOT irrigate within 2 hours of application.
• Do NOT reseed for 3 months after application.
• May be tank-mixed with Killex or other broadleaf herbicides
• Do NOT tank-mix with other products for application to putting greens.

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Related Links

• Weeds in Ontario
• Turfgrass in Ontario
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control

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