Herbicide Recommendations for Strawberries: 4 to 6 Weeks After Planting

Table of Contents

1. Soil Applied Grass and Broadleaf Herbicides
• Sinbar
2. Postemergence Grass Herbicides
   • Poast Ultra + Merge
   • Venture L
3. Postemergence Broadleaf Herbicides
• 2,4-D
4. Postemergence Grass and Broadleaf Herbicides
   • Glyphosate (wick wiper)
   • Glyphosate (spot spray)
5. Strawberry Herbicide Rating Tables (Table 14-1) (PDF 24k)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
6. Other Strawberry Weed Control Recommendations
• First (Planting) Year
• Before Planting
• 2 to 4 Weeks After Planting
• Late Summer/Fall (Labour Day)
• Late Fall
• Harvesting Year
• Spring After Mulch Removal
• Renovation
• Late Summer/Fall (Labour Day)
• Late Fall
7. Related Links

Soil Applied Grass and Broadleaf Herbicides

Precautions

• PRE - Apply before weeds emerge or to very small weeds.
• Apply when mother plants are well established but before runnering becomes extensive and new runner plants are rooting.
• Apply in at least 300 L/ha water (120 L/ac).
• Use lower rate on sandy soils low in organic matter.
• Use lower rate on sensitive varieties such as Kent, Bounty, Micmac, Annapolis, Glooscap and Cavendish since they may be severely injured.
• Do NOT apply to weak or diseased plants of any variety.
• Do NOT overlap spray swaths. Calibrate sprayer accurately.
• Shallow cultivation can be done to train runners and control escaped weeds without destroying the effectiveness of Sinbar.

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Postemergence Grass Herbicides

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. Always use appropriate drift management technology.

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. 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° 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.
• Wait at least 14 days after application before applying Sinbar.
• Do NOT apply closer than 25 days to harvest.

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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 the 2-5 leaf stage of annual grasses (2-4 leaf for foxtails)..
• Apply at 2 L/ha (0.8 L/ac) at the 3-5 leaf stage of quackgrass and wirestem muhly. Thorough preplant tillage will ensure more uniform quackgrass emergence. Cultivate after 7 days.
• Use ONLY one application per season.
• Wait at least 14 days after application before applying Sinbar.

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Postemergence Broadleaf Herbicides

Precautions

• Use the amine formulation.
• Apply in 100-200 L/ha of water (40-80 L/ac).
• Use low pressure and a coarse spray to minimize risk of spray drift to susceptible crops.
• Do NOT use while early runners are rooting.
• Do NOT use between mid-August and fall dormancy when flower buds are developing for next year's crop.

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Postemergence Grass and Broadleaf Herbicides

Precautions

• Apply with a rope wick or other similar device when weeds are 15 cm above the crop.
• Avoid contact with the strawberry plants.
• Do NOT apply when weeds are wet.
• See Chapter 2, Wiper Applicators for Selective Weed Control.

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Precautions

• Use hand held sprayers for a spot treatment if wiper equipment is not available.
• Avoid contact with strawberry plant - crop in the treated area will be killed.
• Do NOT apply closer than 30 days before 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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