Will Mesotrione Kill Bermuda Grass? An In-Depth Look at the Herbicide and Its Impacts

Mesotrione is a selective herbicide primarily used for controlling a variety of broadleaf and certain annual grass weeds in turfgrass, corn, and other crops. Among the many questions surrounding herbicide use, one particularly pertinent query for homeowners and landscape professionals is whether mesotrione will impact Bermuda grass, a popular warm-season turfgrass. This article will explore the implications of using mesotrione in settings where Bermuda grass is present.

Understanding Mesotrione

Mesotrione functions by inhibiting the production of carotenoids in plants, leading to the destruction of chlorophyll. This process results in the whitening of sensitive plants, making it easier to identify them for management purposes. Mesotrione is known for being effective against various weeds, such as dandelions and crabgrass, but its selective nature raises concerns about its impact on desirable grass species like Bermuda grass.

The Selective Nature of Mesotrione

The selectivity of mesotrione is a function of its application rate and the timing of its use. When applied according to label instructions, mesotrione can effectively control harmful weeds without severely affecting established Bermuda grass. However, care must be taken to adhere to recommended rates and timings to mitigate any potential damage.

Effects on Bermuda Grass

Research has shown that mesotrione is generally safe for Bermuda grass when used judiciously. Studies indicate that while mesotrione may cause temporary discoloration or stress in Bermuda grass, particularly in young or newly established lawns, mature and well-established Bermuda grass is usually resilient to its effects.

The application rate is crucial; typically, rates above 0.25 lbs/acre can result in phytotoxicity, leading to noticeable yellowing or bleaching of the grass. To prevent damaging the Bermuda grass, using lower rates and ensuring that the grass is actively growing can lead to better outcomes.

Guidelines for Use

1. Soil Moisture Ensure the soil is adequately moist before application. This helps the herbicide to penetrate and work effectively against the targeted weeds.

2. Timing The best time to apply mesotrione is during the early growth stages of weeds. Avoid applying during the peak growing season of Bermuda grass to minimize potential damage.

3. Weather Conditions Apply mesotrione when the weather is calm and avoid using it when rain is imminent. Wind can cause drift and could inadvertently affect other desirable plants.

4. Adjuvants Using appropriate adjuvants can enhance the effectiveness of mesotrione and should be considered based on specific label recommendations.

5. Post-Application Care After application, monitor the Bermuda grass for any signs of stress or discoloration. If adverse effects occur, appropriate remedial steps should be taken, including watering and avoiding further stress on the grass.

Alternatives to Mesotrione

In instances where there is significant concern about the impact on Bermuda grass, alternative herbicides or methods for weed control should be considered. Non-selective herbicides, manual weeding, or cultural practices like mowing and aeration can help manage weed populations without risking damage to Bermuda grass.

Conclusion

In conclusion, mesotrione can be an effective tool for managing unwanted weeds in Bermuda grass if used correctly. Understanding its selective nature and following application guidelines can help in minimizing any potential harm to this resilient turfgrass. As with any herbicide, careful consideration and adherence to best practices will yield the best results, maintaining the health and aesthetic appeal of Bermuda grass lawns. When in doubt, consulting with a local extension service or a turf management professional can provide tailored advice to meet specific needs and conditions.