Herbicide Recommendations for 1st Year Crown-Established Asparagus: Postemergence Grass Herbicides

Table of Contents

1. Poast Ultra + Merge
2. Venture L
3. Vegetable Herbicide Weed Control Ratings (Table 13-1) (PDF file - 24kb)
   • Annual Grasses
   • Broadleaf Weeds
   • Perennial Weeds
4. Other Asparagus Weed Control Recommendations:
• Before Emergence of Direct Seeded Asparagus
  • Postemergence Grass and Broadleaf Herbicides
• Direct Seeded Asparagus
  • Postemergence Grass Herbicides
• 1st Year Crown-Established Asparagus
  • Soil Applied Grass and Broadleaf Herbicides
• 2nd Year & Established Asparagus
  • Soil Applied Grass and Broadleaf Herbicides
  • Postemergence Grass Herbicides
  • Postemergence Broadleaf and Grass Herbicides
  • Before Spear Emergence or After Last Cutting
  • During Harvest Immediately After Cutting
  • After Last Cutting
• 3rd Year and Established Asparagus
  • Before Spear Emergence or After Last Cutting
5. Related Links

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 45o will give better coverage.
• Do NOT use flood jet or hollow cone nozzles.
• Do NOT apply if rain is expected within 1 hr. after application.
• Preharvest interval is 40 days.

Precautions

• Apply to actively growing grasses prior to 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.

Related Links

• Weeds in Ontario
• OMAFRA Vegetables: Asparagus
• 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

| Top of Page |