Herbicide Recommendations for Soybeans: Postemergence Tank-mix Options

Excerpt from 2008 Chapter 11, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Assure II + Pinnacle + Basagran Forte + Sure-Mix
2. Assure II + Pinnacle + Sure-Mix
3. Assure II + Classic + Sure-Mix
4. Blazer + Basagran Forte for ragweed, pigweed
5. Blazer + Basagran Forte for lamb's-quarters
6. Excel Super + Basagran Forte
7. Excel Super + Basagran Forte + Pinnacle
8. Excel Super + Pinnacle
9. Pinnacle + Basagran Forte
10. Reflex + Pinnacle + Agral 90
11. Pursuit + Firstrate + non-ionic surfactant + liquid fertilizer
12. Pursuit + Reflex + Agral 90 + liquid fertilizer
13. Venture L + Basagran Forte + Assist
14. Soybean Herbicide Weed Control Ratings (Table 11-1) (PDF file - 133 kb)
    • Annual Grasses
    • Broadleaf Weeds
    • Perennial Weeds
15. Other Soybean Weed Control Recommendations
    • Pre-Plant Burndown Herbicides
    • Soil Applied Grass Herbicides
    • Soil Applied Broadleaf Herbicides
    • Soil Applied Grass and Broadleaf Herbicides
    • Soil Applied Tank-mix Options
    • Postemergence Grass Herbicides
    • Postemergence Broadleaf Herbicides
    • Postemergence Grass and Broadleaf Herbicides
    • Postemergence Grass and Broadleaf Herbicides - Roundup Ready (glyphosate tolerant) varieties only
    • Spot Treatment
    • Wick Wiper and Roller Application
    • Preharvest
16. Stages of Soybean Leaf Development
17. Related Links

Precautions

• Apply to soybeans within the 1-4 leaf trifoliate stage, ensuring the 1st trifoliate is fully expanded before application.
• Do NOT apply to soybeans, which have initiated flowering.
• If leaf stages of the grass and broadleaf weeds do not coincide, a sequential application of the grass and broadleaf herbicides is required to ensure satisfactory control.

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Precautions

• Delay application until soybeans have 1-2 fully expanded trifoliate leaves.
• Do NOT apply to soybeans, which have initiated flowering.
• If leaf stages of the grass and broadleaf weeds do not coincide, a sequential application of the grass and broadleaf herbicides is required to ensure satisfactory control.
• Velvetleaf control may be reduced with a tank-mix application.
• For optimum control, make separate applications of Pinnacle and Assure.

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Precautions

• Delay application until soybeans have 1-2 fully expanded trifoliate leaves.
• Do NOT apply to soybeans, which have initiated flowering.
• If leaf stages of the grass and broadleaf weeds do not coincide, a sequential application of the grass and broadleaf herbicides is required to ensure satisfactory control.
• If target weeds are yellow foxtail or quackgrass use Assure II at a rate of 0.63 L/ha.

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Precautions

• Use when common ragweed and/or redroot pigweed is the dominant weed(s).

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Precautions

• Use when lamb's-quarter is the dominant weed.

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Precautions

• If annual broadleaf and grassy weeds are not in the correct stage for a tank-mix application, use a split application at the correct stage for each product.

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Precautions

• If broadleaf and grassy weeds are not in the correct stage for a tank-mix application, use a split application at the correct stage for each product.

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Precautions

• If broadleaf and grassy weeds are not in the correct stage for a tank-mix application, use a split application at the correct stage for each product.

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Precautions

• Apply to emerged weeds when soybeans have the first trifoliate leaf fully expanded.
• Do NOT apply to soybeans that have initiated flowering.
• If Canada thistle, yellow nutsedge and field bindweed are target species a second application may be required.

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Precautions

• Apply early postemergence at the 2-4 leaf stage of weeds and 1 to 2-trifoliate stage of the crop.

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• Apply when weeds are up to the 2-true leaf stageUse for control of annual grasses, lamb's quarters and redroot pigweed

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Precautions

• Use the lower rate of Reflex for ragweed only.
• Use the higher rate of Reflex for lamb's-quarters.

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Precautions

• Apply when soybeans are at the unifoliate to 3rd trifoliate stage and when weeds are small and actively growing.
• Use the 0.8 L/ac rate of Venture L to control wirestem muhly.
• Temporary crop injury may occur under abnormally hot and humid conditions.

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Related Links

• Weeds in Ontario
• Soybeans in Ontario
• Problem Weed Control in Field Crops
• 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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