Volunteer corn refers to corn plants that sprout in fields where corn was previously grown, typically as a result of leftover seed from the previous season. While they may seem harmless, these plants can pose a serious problem for farmers, as they compete with the desired crops for nutrients, light, and space.

Volunteer corn is especially problematic in fields where herbicide-resistant crops are grown, as it can lead to crop yield losses. Effective herbicide application is critical to control volunteer corn and prevent it from becoming a major issue.

This guide will walk you through the best herbicides for managing volunteer corn. From non-selective herbicides to specific treatments for corn fields, here’s what you need to know to effectively manage this persistent weed.

10 Best Herbicides for Volunteer Corn

1. Glyphosate (Roundup)

Glyphosate is one of the most widely used herbicides for controlling volunteer corn. It’s a non-selective herbicide, meaning it kills almost any plant it comes into contact with, including volunteer corn. Glyphosate works by inhibiting a plant’s ability to synthesize certain amino acids, leading to its death.

This herbicide is most effective when applied to actively growing volunteer corn during the early stages. Be cautious when using glyphosate near desirable crops, as it can harm or kill them as well. Glyphosate is ideal for large-scale field management and is often used in conjunction with other weed control methods.

2. Atrazine Herbicide

Atrazine is a selective herbicide commonly used for corn crops. It works by inhibiting photosynthesis in broadleaf weeds and grasses like volunteer corn, preventing them from growing. Atrazine is typically used early in the season before the volunteer corn has reached a large size.

It is particularly effective when applied to corn fields during the pre-emergence or early post-emergence stages. Atrazine is relatively safe for corn crops but can be harmful to other plants, so care should be taken when using it in fields with mixed crops.

3. Accent Herbicide

Accent is a selective post-emergence herbicide designed specifically for corn fields. It targets grasses and broadleaf weeds, including volunteer corn. Accent works by inhibiting cell division in the plant, leading to the weed’s death.

Accent is effective in controlling volunteer corn when applied early in the season, ideally when the plants are still small. It is safe for use on corn crops but may not be effective on larger volunteer corn plants, so early treatment is crucial.

4. Dual Magnum Herbicide

Dual Magnum is a pre-emergence herbicide that provides effective control of grass weeds like volunteer corn. It works by preventing seed germination, stopping the volunteer corn from sprouting in the first place. Dual Magnum is effective in both conventional and no-till corn fields.

It should be applied to the soil before or at planting time, as it controls weeds before they emerge. Dual Magnum can be used in combination with other herbicides for optimal results, particularly in fields with high weed pressure.

5. Callisto Herbicide

Callisto is a selective herbicide that works by inhibiting photosynthesis in broadleaf weeds and grasses. It is effective against volunteer corn and can be applied during the early post-emergence stages. Callisto has a low toxicity to most crops, making it a safer option for managing weeds in cornfields.

Callisto can be applied to corn fields after planting, but it should be used carefully to avoid damaging sensitive crops. It is highly effective against small volunteer corn plants but may be less effective against larger weeds.

6. Halex GT Herbicide

Halex GT is a pre-mixed herbicide that combines glyphosate, atrazine, and mesotrione to provide broad-spectrum control of weeds, including volunteer corn. This combination of herbicides allows for effective post-emergence control, even on tough weeds like volunteer corn.

Halex GT is typically applied during the growing season when volunteer corn is actively growing. It is a versatile herbicide that can be used in a variety of crops, including corn, soybeans, and wheat, making it a good option for multi-crop systems.

7. Liberty Herbicide

Liberty is a non-selective herbicide that is effective against volunteer corn and many other weeds. It contains the active ingredient glufosinate, which disrupts the production of essential amino acids in plants, causing them to die.

Liberty is best used in fields where a wide range of weeds, including volunteer corn, need to be controlled. It is often applied when weeds are actively growing and should be used with caution near desirable crops.

8. 2,4-D Herbicide

2,4-D is a selective herbicide that can be used to control volunteer corn and other broadleaf weeds. It works by disrupting plant growth hormones, causing uncontrolled growth and eventually killing the plant.

2,4-D is effective when applied during the active growing season and is often used in combination with other herbicides for comprehensive weed management. However, it should be used carefully as it can also affect other plants if not applied according to the manufacturer’s instructions.

Buyer’s Guide: Choosing the Best Herbicide for Volunteer Corn

When selecting the best herbicide for volunteer corn control, consider the following factors:

• Effectiveness: Choose herbicides that are specifically labeled for volunteer corn control. Pre-emergence herbicides can prevent germination, while post-emergence herbicides target established weeds.
• Timing: The timing of herbicide application is crucial for success. Early application is key for preventing corn from establishing itself in the field.
• Crop Safety: Ensure the herbicide is safe for use on the crop being grown, as some products may damage certain types of plants.
• Environmental Impact: Select herbicides that have minimal environmental impact, especially near sensitive areas like water sources or wildlife habitats.
• Cost: Consider the cost of herbicides in relation to the size of the area you need to treat. Some herbicides may be more cost-effective for large-scale use.

Conclusion

Volunteer corn can be a challenging problem for farmers, but with the right herbicide, you can effectively control this invasive weed.

Herbicides like Glyphosate, Atrazine, and Accent offer reliable solutions for managing volunteer corn and ensuring healthy crop yields. Always follow application guidelines and use these products responsibly to minimize environmental impact.

By selecting the most suitable herbicide and applying it at the right time, you can keep volunteer corn under control and prevent it from interfering with your crops. Proper weed management is essential for maintaining a healthy and productive farm.