Herbicide Recommendations for Direct Seeded Asparagus: Postemergence Grass Herbicides

Table of Contents

1. Introduction
2. Poast Ultra + Merge
3. Venture L
4. Vegetable Herbicide Weed Control Ratings (Table 13 -1) (PDF file - 24kb)
   • Annual Grasses
   • Broadleaf Weeds
   • Perennial Weeds
5. Other Asparagus Weed Control Recommendations:
• Before Emergence of Direct Seeded Asparagus
  • Postemergence Grass and Broadleaf Herbicides
• 1st Year Crown-Established Asparagus
  • Soil Applied Grass and Broadleaf Herbicides
  • Postemergence Grass Herbicides
• 2nd Year & Established Asparagus
  • Soil Applied Grass and Broadleaf Herbicides
  • Postemergence Grass Herbicides
  • Postemergence Broadleaf and Grass Herbicides
  • During Harvest Immediately After Cutting
  • After Last Cutting
• 3rd Year and Established Asparagus
  • Before Spear Emergence or After Last Cutting
6. 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.

| Top of Page |

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.

  | Top of Page |

  ---

  Venture L

  Trade Name	Venture L
  Active Ingredient	fluazifop-p-butyl
  Formulation	125 g/L
  Rate per hectare (active)	0.075 to 0.25 kg/ha
  Rate per hectare (product)	0.6 to 2 L/ha
  Rate per acre (product)	0.24 to 0.8 L/ac

  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.

  | Top of Page |

  ---

  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 |