Herbicide Recommendations for Cranberries: Postemergence Grass Herbicides

Table of Contents

1. Introduction
2. Venture L
3. Poast Ultra + Merge
4. Tree Fruit Herbicide Rating Tables (Table 15-1) (PDF 110k)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
5. Other Cranberry Weed Control Recommendations
   • Soil Applied Grass and Broadleaf Herbicides
   • Postemergence Broadleaf Herbicides
   • Postemergence Grass and Broadleaf Herbicides
6. 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 non-bearing cranberries.
• 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 and wirestem muhly. Thorough preplant tillage will ensure more uniform quackgrass emergence.
• Use ONLY one application per season.

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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. 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 1 hr. after application.
• Do NOT apply closer than 15 days to harvest.

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Related Links

• Weeds in Ontario
• Berries 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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