Dallisgrass (Paspalum dilatatum) is a common, resilient weed that often invades lawns and pastures. It’s tough, spreading through both seeds and rhizomes, making it difficult to eradicate. One potential solution is MSM (metsulfuron-methyl), a selective herbicide known for its efficacy against a variety of broadleaf weeds and some grasses. But can MSM truly kill dallisgrass?
The Effectiveness of MSM on Dallisgrass
Metsulfuron-methyl is commonly used in agricultural and turf management due to its potency and relatively low application rates. However, its effectiveness against dallisgrass is somewhat mixed. While MSM can stress and suppress dallisgrass, it may not provide a complete kill, especially in mature or well-established stands. Repeated applications are often necessary to achieve significant control, and even then, total eradication may not be guaranteed.
The variability in MSM’s effectiveness stems from several factors:
1. Application Timing: Applying MSM at the right growth stage of dallisgrass is crucial. Young, actively growing plants are more susceptible than mature, established ones.
2. Environmental Conditions: Weather conditions, such as temperature and rainfall, can impact the herbicide’s performance.
3. Application Rate: Correct dosing is critical; too little won’t be effective, and too much can damage desired grasses.
For homeowners and turf managers seeking a reliable Paspalum dilatatum solution, MSM might be part of the strategy but not a standalone solution.
What Does Fusilade Kill?
Fusilade (fluazifop-p-butyl) is another herbicide often considered in the fight against invasive grasses. It’s a selective, systemic herbicide primarily targeting grassy weeds while sparing broadleaf plants. Fusilade is known for its broad spectrum of activity against various grassy weeds, but does it kill dallisgrass?
Fusilade’s Spectrum of Activity
Fusilade is effective against a wide range of grassy weeds, including:
– Bermuda grass
– Crabgrass
– Goosegrass
– Johnsongrass
While Fusilade can be highly effective against these weeds, its impact on dallisgrass is less straightforward. Fusilade can damage Paspalum dilatatum and stunt its growth, but similar to MSM, it often requires multiple applications for substantial control. The effectiveness can be enhanced when used in conjunction with other herbicides or cultural practices.
Limitations of Fusilade
Fusilade’s selective nature is both its strength and weakness. While it can target grassy weeds without harming broadleaf plants, its action on dallisgrass may not be as robust as desired for complete eradication. Additionally, environmental conditions and the growth stage of dallisgrass at the time of application play significant roles in determining its efficacy.
How to Spot Kill Dallisgrass?
For those determined to rid their lawns and pastures of dallisgrass, spot killing can be an effective approach. This method targets only the unwanted plants, minimizing collateral damage to desirable grasses and plants.
Step-by-Step Guide to Spot Killing Dallisgrass
1. Identify Dallisgrass: Dallisgrass can be recognized by its coarse texture, spreading growth habit, and seed heads that resemble small spikes. Ensure proper identification to avoid mistakenly targeting beneficial grasses.
2. Prepare the Herbicide: Choose a suitable herbicide known to affect Paspalum dilatatum, such as glyphosate (Roundup) or a selective herbicide like Fusilade. Follow the manufacturer’s instructions for mixing and application rates.
3. Apply the Herbicide: Using a handheld sprayer, apply the herbicide directly to the dallisgrass clumps. Take care to cover the entire plant, including leaves and stems, to ensure thorough absorption.
4. Monitor and Repeat: After the initial application, monitor the treated areas for signs of regrowth. Paspalum dilatatum is resilient, so multiple applications may be necessary to achieve complete control.
5. Cultural Practices: To prevent dallisgrass from returning, maintain healthy turf through proper mowing, fertilization, and irrigation practices. A robust, dense lawn can outcompete weeds and reduce the likelihood of dallisgrass re-establishment.
Does Roundup Kill Dallisgrass?
Roundup, a popular brand of glyphosate-based herbicide, is known for its non-selective action, meaning it kills almost any plant it touches. This characteristic makes it a potent weapon against tough weeds like dallisgrass, but its non-selective nature also poses challenges.
Roundup’s Mechanism of Action
Glyphosate, the active ingredient in Roundup, works by inhibiting an enzyme essential for plant growth. When applied, it is absorbed through the leaves and transported throughout the plant, ultimately leading to the death of the entire plant, including the roots.
Effectiveness of Roundup on Dallisgrass
Roundup is highly effective at killing dallisgrass, but its non-selective action means it will also kill any other plants it contacts. This makes it suitable for spot treatment or use in areas where complete vegetation control is desired, such as driveways, sidewalks, or preparing an area for replanting.
Application Tips for Roundup
1. Targeted Application: Use a shielded sprayer or a sponge applicator to apply Roundup directly to Paspalum dilatatum while minimizing contact with desirable plants.
2. Weather Conditions: Apply on a calm, dry day to prevent drift and ensure the herbicide remains on the target plants long enough to be absorbed.
3. Timing: Apply when dallisgrass is actively growing for the best results. Avoid application just before rain to prevent wash-off.
Safety Considerations
When using Roundup, always follow safety guidelines:
– Wear protective clothing, including gloves and goggles.
– Keep pets and children away from treated areas until the herbicide has dried.
– Be mindful of potential environmental impacts, particularly in areas near water sources.
Conclusion
Controlling dallisgrass requires a multifaceted approach. MSM and Fusilade offer selective options but may need to be part of a broader strategy. Spot killing with precise application techniques can effectively target dallisgrass without widespread damage to desirable plants. Roundup, while effective, requires careful application due to its non-selective nature. By understanding these options and their respective strengths and limitations, homeowners and turf managers can devise a comprehensive plan to manage and ultimately eradicate dallisgrass from their landscapes.
