Late-Season Herbicide Strategies for Corn: Effective Solutions for Weed Management

Essential Herbicide Options for Late-Season Corn Weed Control to Maximize Yield and Minimize Harvest Issues

As the growing season progresses, managing weeds in corn fields becomes increasingly challenging, especially for those who faced excessive rainfall and other early-season issues. Sarah Lancaster from Kansas State University provides detailed insights into effective herbicide options for late-season weed control in corn. This guide aims to assist farmers in selecting the right products and strategies to maintain crop health and ensure a successful harvest.

Understanding the Need for Late-Season Herbicide Applications

While pre-emergence herbicides are crucial for early-season weed control, some situations require additional measures as the season advances. Excessive rainfall and sandy soils can lead to weed emergence even when initial control measures were adequate. Late-season weed control is essential not only to protect yield potential but also to prevent harvest difficulties and reduce the weed seed bank for future seasons.

Herbicide Options for Corn Over 12 Inches Tall

Below is a comprehensive list of herbicides suitable for use on corn taller than 12 inches, including details on their application and effectiveness:

Herbicide	Product	Maximum Corn Height	Comments
Glufosinate	Liberty, others	V6	Effective on emerged weeds; requires drop nozzles for taller crops.
Tolpyralate	Shieldex	V6 or 20 inches	Can be mixed with Tough for enhanced control.
Clopyralid	Stinger, others	24 inches	Fair to good control of pigweed.
Topramezone	Armezon, Impact	V8	Mix with Tough for enhanced weed control.
Pyridate	Tough	V8	Enhances Group 27 herbicides.
Mesotrione	Callisto, others	V8 or 30 inches	Effective for larger corn; mix with Tough for enhanced control.
Glyphosate	Many	V8 or 30 inches	Use drop nozzles for RR2 hybrids over 30 inches.
Nicosulfuron	Accent	36 inches	Use drop nozzles for better coverage.
Tembotrione	Laudis	V9	Can be mixed with Tough for improved effectiveness.
Carfentrazone	Aim	14 leaves	Use drop nozzles for better coverage.
Bromoxynil	Moxy, others	Tasselling	Provides fair control of pigweed.
Dicamba	Clarity, others	Tasselling	Fair to good crop safety; use drop nozzles for better application.
DiFlexx	DiFlexx	V10	Good crop safety; effective against late-season weeds.
Status	Status	V8 or 30 inches	Excellent crop safety; high effectiveness.
2,4-D	Amine or ester	Tasselling	Use drop nozzles if corn is over 8 inches.
Enlist One	Enlist One	V8 or 30 inches	Effective herbicide for late-season control.

Strategies for Successful Herbicide Application

Timing: Apply herbicides when corn is at the appropriate growth stage for the selected product. Late-season applications are typically performed when weeds are actively growing and before they reach the reproductive stage.
Application Methods: Some herbicides require drop nozzles to reduce the risk of crop injury and ensure effective coverage of weeds. Ensure that the application equipment is set up correctly to achieve the best results.
Weather Conditions: High temperatures can affect herbicide efficacy. It’s important to follow specific application guidelines related to weather conditions as outlined in product recommendations.

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Late-Season Herbicide Strategies for Corn: Effective Solutions for Weed Management

Kira Demina

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