Herbicide Recommendations for Established Grapes: Postemergence Grass and Broadleaf Herbicides

Excerpt from 2008 Chapter 15, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Introduction
2. Glyphosate
3. Glyphosate (wick wiper)
4. Glyphosate (spot spray)
5. Glyphosate + Princep Nine-T
6. Gramoxone
7. Gramoxone + Tropotox Plus
8. Gramoxone + Devrinol
9. Ignite
10. Ignite + Princep Nine-T or Simadex
11. Grape Herbicide Ratings:
    from Tree Fruit Herbicide Rating Tables (Table 15-1) (PDF 110k)
    • Annual Grasses
    • Annual Broadleaf Weeds
    • Perennial Weeds
12. Other Grape Weed Control Recommendations
    • New and Non-Bearing Grapevines
      • Soil Applied Grass Herbicides
    • Established Grapevines
      • Postemergence Grass and Broadleaf Herbicides
13. 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. Always use appropriate drift management technology.

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Precautions

• For actively growing weeds.
• Apply in 200-300 L/ha water (80-120 L/ac) as a directed spray.
• Do NOT use on vines less than 3 years old.
• Direct spray to avoid leaves and green stems of grapevines.
• Do NOT mow or till weeds for at least 5-7 days after application. Wait longer if cool.
• Only weeds emerged at application time will be controlled. Additional weed control programs will be necessary to control weeds germinating later.
• Repeat application to regrowth may be necessary for complete control.
• Do NOT apply closer than 14 days to harvest.
• For specific information on product rates and notes for annual and perennial weed control refer to Table 4-2.

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Precautions

• Apply with a rope wick or other similar device when weeds are at the optimum stage.
• Direct spray to avoid leaves and green stems of grapevines.
• Do NOT apply when weeds are wet.
• Do NOT use on vines less than 3 years old.
• See Chapter 2, Wiper Applicators for Selective Weed Control.
• Do NOT apply closer than 14 days to harvest.

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Precautions

• Use hand held sprayers as a spot treatment if wiper equipment is not available.
• Direct spray to avoid leaves and green stems of grapevines.
• Do NOT use on vines less than 3 year old
• Do NOT apply closer than 14 days before harvest.

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Precautions

• For vines established at least 3 years.
• Use as a directed spray avoiding leaves, suckers and green bark on vines.
• Use higher rates for perennial weeds and heavy weed infestations.
• To control emerged weeds with residual control of germinating annual weeds.
• See Precautions for Ignite and simazine.
• Do NOT use within 40 days of harvest.

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Precautions

• Apply in 1100 L/ha (440 L/ac) water.
• For spot spraying, apply 55 mL in 10 L of water sprayed to wet weed foliage.
• Use on vines established on trellises.
• Avoid contact with green bark, leaves or fruit.
• May be tankmixed with Karmex.

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Precautions

• Apply in late May or early June, or when bindweed starts to bloom.
• Apply in 1000 L/ha water (400 L/ac) as a low pressure, coarse spray.
• For spot spraying, with a shielded nozzle, apply 55 mL Gramoxone + 30 mL Tropotox Plus/10 L water/100 m².
• Use only when necessary as a spot treatment. Tropotox Plus can injure grapes.
• Direct spray to avoid contact with leaves and stems of grapevines.

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Precautions

• Add Devrinol to tank first, then agitate and add Gramoxone.
• Apply in 1100 L/ha water (440 L/ac).

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Precautions

• For vines established at least 3 years.
• Apply as a directed spray before annual weeds are 30 cm high.
• Avoid suckers and green bark.
• Use 110-330 L/ha water (44-132 L/ac).
• Where weed growth is heavy, use the higher rate and larger water volume.
• Do NOT apply closer than 40 days to harvest.

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Precautions

• For vines established at least 3 years.
• Use as a directed spray avoiding leaves, suckers and green bark on vines.
• To control emerged weeds with residual control of germinating annual weeds.
• See Precautions for Ignite and simazine.
• Do not harvest until 40 days after application.

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Related Links

• Weeds in Ontario
• Apples in Ontario
• Tender Fruit in Ontario
• Grapes in Ontario
• 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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