Herbicide Recommendations for Herbaceous Ornamentals: Postemergence Grass Herbicides

Excerpt from 2008 Chapter 16, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Introduction
2. Venture L
3. Nursery and Ornamental Herbicide Rating Table (Table 16-1) (PDF 63k)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
4. Other Herbaceous Ornamental Weed Control Recommendations
   • Soil Applied Grass and Broadleaf Herbicides
   • Postemergence Grass and Broadleaf Herbicides
5. 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. Adjuvants will frequently improve the weed control when used as directed. Weather or other conditions may influence the optimum rate of adjuvant, see the product label for more details. Always use appropriate drift management technology.

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Precautions

• For Campanula and Sedum - direct spray ONLY to avoid contact with crop.
• Apply POST to actively growing grasses before tillering.
• Apply at 0.6 L/ha (0.24 L/ac) at 2-5 leaf stage of volunteer corn.
• Apply at 0.8 L/ha (0.32 L/ac) at 2-5 leaf stage of volunteer wheat and barley.
• Apply at 1 L/ha (0.4 L/ac) at 2-5 leaf stage of annual grasses (2-4 leaf for foxtails).
• Apply at 2 L/ha (0.8 L/ac) at 3-5 leaf stage of quackgrass & wirestem muhly.
• Thorough preplant tillage, fragmenting quackgrass rhizomes improves control.
• Many species are tolerant in field production only. (consult the label for list of tolerant species)

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Related Links

• Weeds in Ontario
• Nursery and Landscape Plants in Ontario
• Problem Weed Control in Field Crops
• 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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