Herbicide Recommendations for Carrots: 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 Carrot Weed Control Recommendations
   • Preplant Incorporated followed by Postemergence
   • Preemergence followed by Postemergence
   • Soil Applied Grass and Broadleaf Herbicides
   • Postemergence Grass and 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.

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.
• Do NOT apply if rain is expected within 1 hr. after application.

Precautions

• Apply to actively growing grasses.
• For annual grass, use 0.32 L/ha. Apply at the 1-6 leaf stage (2-5 is optimum).
• For volunteer grains, use 0.47 L/ha. Apply at the 1-6 leaf stage (2-5 is optimum).
• For quackgrass, use 1.1 L/ha. 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).
• Grasses emerging after application will not be controlled.
• Spray tips angled forward 45^o will give better coverage.
• Do NOT use flood jet or hollow cone nozzles.
• Do NOT apply if rain is expected within one hour after application.
• Preharvest interval is 49 days.

Precautions

• Apply when crop is 10 cm in height or less.
• 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
• Do NOT cultivate between rows until 5 days after application.
• Apply other postemergence herbicides separately at least 3 days after Venture L.

Related Links

• Weeds in Ontario
• Vegetables in Ontario
• Carrots 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

   

  | Top of Page |