Post Emergent Herbicides: The Ultimate Guide

Are you tired of weeds taking over your lawn or garden? Do you want to keep your plants healthy and thriving? If so, you may want to consider using post emergent herbicides. These powerful chemicals can help you control weeds and keep your garden looking its best.

In this guide, we'll take a closer look at post emergent herbicides. We'll discuss what they are, how they work, and the different types available. We'll also explore their benefits and drawbacks, as well as safety considerations. By the end, you'll have a better understanding of these powerful weed killers and how to use them effectively.

What Are Post Emergent Herbicides?

Post emergent herbicides are a type of weed killer that is applied after the weeds have already emerged from the soil. They work by targeting the leaves and stems of the plant, which then absorb the chemicals and eventually die off. These herbicides are typically used to control annual, biennial, and perennial broadleaf weeds, as well as certain types of grasses.

There are two main types of post emergent herbicides: selective and non-selective. Selective herbicides are designed to target specific types of weeds while leaving other plants unharmed. Non-selective herbicides, on the other hand, will kill any plant that comes into contact with the chemical.

Selective Post Emergent Herbicides

Selective post emergent herbicides are ideal for homeowners who want to control weeds without harming their desired plants. These herbicides work by targeting specific types of weeds, such as dandelions, clover, or crabgrass. They are typically applied as a liquid spray or granular product and are absorbed through the leaves of the targeted weed.

Some common selective post emergent herbicides include:

• 2,4-D
• MCPA
• Dicamba
• Triclopyr

Benefits of Selective Post Emergent Herbicides

One of the biggest benefits of using selective post emergent herbicides is that they only target specific types of weeds, leaving your desired plants unharmed. This means you can control weeds without having to worry about damaging your lawn or garden. Additionally, these herbicides are often less toxic than non-selective herbicides, making them safer for use around children and pets.

Drawbacks of Selective Post Emergent Herbicides

While selective post emergent herbicides can be effective at controlling weeds, they may not work on all types of weeds. Additionally, some weeds may develop resistance to certain herbicides over time, making them more difficult to control. Finally, it's important to follow the manufacturer's instructions carefully when using these herbicides, as overuse or incorrect application can damage your plants.

Non-Selective Post Emergent Herbicides

Non-selective post emergent herbicides are designed to kill any plant that comes into contact with the chemical. These herbicides are typically used in areas where there are no desirable plants, such as driveways, sidewalks or gravel paths. They are also commonly used in agricultural settings to clear fields before planting crops.

Some common non-selective post emergent herbicides include:

• Glyphosate (Roundup)
• Glufosinate (Liberty)
• Diquat (Reward)

Benefits of Non-Selective Post Emergent Herbicides

One of the biggest benefits of using non-selective post emergent herbicides is that they are very effective at killing weeds. They can also be used to clear large areas quickly and easily. Additionally, these herbicides are often less expensive than selective herbicides.

Drawbacks of Non-Selective Post Emergent Herbicides

While non-selective post emergent herbicides can be effective at controlling weeds, they can also be very damaging to desirable plants. These herbicides should only be used in areas where there are no desirable plants, and extreme caution should be taken when applying them. Additionally, some non-selective herbicides have been linked to health problems in humans and animals, so it's important to follow all safety precautions when using them.

How Do Post Emergent Herbicides Work?

Post emergent herbicides work by disrupting the normal growth and development of the targeted weed. The chemicals in the herbicide are absorbed through the leaves and stems of the plant, where they interfere with key enzymes and proteins. This causes the plant to stop growing and eventually die off.

Some post emergent herbicides work by mimicking the natural hormones of the plant, which then overwhelms its system and leads to its death. Others work by inhibiting the plant's ability to produce certain amino acids, which are necessary for growth and development.

The Role of Adjuvants

Adjuvants are substances that are added to herbicides to enhance their effectiveness. They can help the herbicide stick to the leaves of the plant, penetrate the waxy cuticle of the leaf, or spread more evenly across the surface of the plant. Some common adjuvants include surfactants, oils, and stickers.

Types of Post Emergent Herbicides

There are several different types of post emergent herbicides available, each with its own unique properties and uses. Some common types include:

Sulfonylureas

Sulfonylureas are a type of selective post emergent herbicide that is commonly used to control broadleaf weeds in turfgrass. They work by inhibiting the plant's ability to produce certain amino acids, which leads to stunted growth and eventual death.

Triazines

Triazines are a type of non-selective post emergent herbicide that is often used in agricultural settings. They work by disrupting the plant's photosynthesis process, which eventually leads to its death.

Phenoxy Acid Herbicides

Phenoxy acid herbicides are a type of selective post emergent herbicide that is commonly used on lawns and golf courses. They work by mimicking the natural hormones of the plant, which leads to its death.

Benefits of Using Post Emergent Herbicides

Using post emergent herbicides can have several benefits for homeowners and gardeners. Some of the most notable benefits include:

• Effective weed control
• Can be used selectively or non-selectively
• Can be applied directly to the weed, minimizing damage to desirable plants
• Can save time and effort compared to manual weeding
• Can be less expensive than other methods of weed control

Drawbacks of Using Post Emergent Herbicides

While post emergent herbicides can be effective at controlling weeds, there are also some potential drawbacks to consider. These may include:

• Can be harmful to desirable plants if used improperly
• May require multiple applications for full effectiveness
• Can have negative environmental impacts if not used responsibly
• May be toxic to humans and animals if ingested or inhaled
• May lead to the development of herbicide-resistant weeds over time

Safety Considerations When Using Post Emergent Herbicides

When using post emergent herbicides, it's important to take appropriate safety precautions to protect yourself, your family, and the environment. Some key considerations include:

• Always read and follow the manufacturer's instructions carefully
• Wear protective clothing, including gloves, goggles, and a mask
• Avoid applying herbicides on windy days to prevent drift
• Keep children and pets away from treated areas until the herbicide has dried completely
• Dispose of herbicide containers and other waste properly

FAQs About Post Emergent Herbicides

1. Can I use post emergent herbicides on my vegetable garden?

It depends on the type of herbicide you are using. Some selective post emergent herbicides may be safe to use on certain types of vegetables, while non-selective herbicides should never be used in a vegetable garden.

2. How often do I need to apply post emergent herbicides?

The frequency of application will depend on the type of herbicide and the severity of the weed problem. In general, most herbicides will need to be reapplied every few weeks or months to maintain effective control.

3. Will post emergent herbicides harm my pets?

Post emergent herbicides can be harmful to pets if ingested or inhaled. It's important to keep pets away from treated areas until the herbicide has dried completely, and to store herbicides out of reach of pets.

4. Are post emergent herbicides safe for the environment?

Post emergent herbicides can have negative environmental impacts if not used responsibly. It's important to follow all safety precautions and dispose of herbicide containers and other waste properly to minimize environmental harm.

5. Can I mix different types of post emergent herbicides together?

It's generally not recommended to mix different types of herbicides together, as this can lead to unpredictable results and may be dangerous. Always follow the manufacturer's instructions carefully and avoid mixing chemicals unless specifically directed to do so.

Post emergent herbicides can be a powerful tool for controlling weeds and keeping your lawn or garden looking its best. Whether you opt for a selective or non-selective herbicide, it's important to use these chemicals safely and responsibly. By following the guidelines outlined in this guide, you can ensure effective weed control without harming the environment or your desired plants.