Herbicide Recommendations for Cabbage, Cauliflower, Broccoli, Brussels Sprouts: Postemergence Grass Herbicides

Table of Contents

1. Introduction
2. Excel Super
3. Poast Ultra + Merge
4. Venture L
5. Vegetable Herbicide Weed Control Ratings (Table 13-1) (PDF file - 86Kb)
   • Annual Grasses
   • Broadleaf Weeds
   • Perennial Weeds
6. Other Cabbage, Cauliflower, Broccoli, Brussels Sprout Weed Control Recommendations
   • Soil Applied Grass and Broadleaf Herbicides
   • Postemergence Broadleaf Herbicides
7. Related Links

Introduction

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

• Apply when majority of annual grasses are in the 1-6 leaf stage or until volunteer corn is up to 25 cm tall.
• Grasses emerging after application will not be controlled.
• Not registered for use on Brussels sprouts.

Precautions

• Apply to actively growing grasses.
• For annual grass, use 0.32 L/ha. Apply at the 1-6 leaf stage.
• For volunteer grains, use 0.47 L/ha.
• For quackgrass, use 1.1 L/ha (Do NOT use this rate on broccoli). Apply up to the 3-leaf stage. Thorough preplant tillage will ensure more uniform quackgrass emergence. Cultivate after 7 days in wide row crops. Use the high rate of Merge for quackgrass.
• Use 100-200 L water/ha (40-80 L water/ac).
• Do NOT apply closer than 70 days to harvest.
• Do NOT use on Brussels Sprouts.
• Do NOT exceed 0.45 L/ha on broccoli.

Precautions

• 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 rhizome improves control.
• Make one application per season.
• Do NOT cultivate between rows until 5 days after application.

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Related Links

• Weeds in Ontario
• Vegetables 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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