Publication 75 Guide to Weed Control: Corn

Chapter 9 - Corn

1. Introduction
2. Conventional Corn Herbicide Recommendations (Field, Seed and Sweet)
   • Corn Leaf Stages
   • Why is Early Season Weed Control so Important in Corn?
   • Preplant Burndown and Residual Control
   • Soil Applied Grass and Broadleaf Herbicides (Preemergence Timing Only)
   • Soil Applied Tank-Mixes (Preemergence Timing Ony)
   • Soil Applied Broadleaf Herbicides (Preemergence Timing Only)
   • Soil Applied and Early Postemergence Grass Herbicides
   • Preemergence and Early Postemergence Grass and Broadleaf Herbicides
   • Soil Applied and Early Postemergence Tank-Mixes (For Control of Grass and Broadleaf Weeds)
   • Postemergence Grass Herbicides
   • Postemergence Broadleaf Herbicides and Tank-Mixes (For Broadleaf Weed Control)
   • Postemergence Tank-Mixes (For Control of Grass and Broadleaf Weeds)
3. Conventional Corn (Field, Seed and Sweet) Herbicide Weed Control Ratings - Table 9-1 (PDF file - 84 KB)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
4. Additonal Weed Control Ratings for Conventional Corn (Field, Seed and Sweet) - (Table 9-2) (PDF 59 KB)
• Grasses
• Annual and Bienniel Broadleaves
• Perennials
5. Glyphosate Tolerant ("Roundup Ready") Corn
   • Weed Management Strategies for Glyphosate Tolerant Corn
   • Preplant Burndown and Residual Control
   • "One-Pass" Postemergence Treatments in Glyphosate Tolerant Corn Only
   • "One-Pass" Postemergence Tank-mixes with Residual Control for Use in Glyphosate Tolerant Corn Only
   • "Pre/Post" Strategies in Glyphosate Tolerant Corn Only
   • "Two-Pass" Postemergence Treatments in Glyphosate Tolerant Corn Only
6. Corn Yield from Different Weed Management Strategies in Glyphosate Tolerant Corn - (Table 9-4) (PDF 42 KB)
7. Glyphosate Tolerant "Roundup Ready" Corn Herbicide Weed Control Ratings - (Table 9-5) (PDF 47 KB)
8. Additional Weed Control Ratings for Glyphosate Tolerant "Roundup Ready" Corn - (Table 9-6) (PDF - 43 kb)
9. Glyphosate Product Rates and Tank-Mix Partners for Use on Glyphosate Tolerant "Roundup Ready" Corn - (Table 9-7) (PDF - 55 kb)
10. Glufosinate Tolerant ("Liberty Link") Corn
    • Weed Management Strategies for Glufosinate Tolerant Corn
    • Preplant Burndown and Residual Control
    • "One-Pass Postemergence Treatments for Glufosinate ("Lifberty Link") Tolerant Corn Only
    • "One-Pass" Tank-mixes with Residual Control for Glufosinate ("Liberty Link") Tolerant Corn Only
    • "Two-Pass" Postemergence Treatments for Glufosinate ("Liberty Link") Tolerant Corn Only
11. Glufosinate "Liberty Link" Tolerant Corn Herbicide Weed Control Ratings - (Table 9-8) (PDF - 45 kb)
12. Additional Weed Control Ratings for Glufosinate "Liberty Link" Corn - (Table 9-9) (PDF - 42 kb)
13. Maximum Weed Leaf Stages (or Height) for Postemergence Herbicide Application in Corn - (Table 9-10) (PDF - 48 kb)

Related Links

• Weeds in Ontario
• Corn 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