Can glyphosate effectively eradicate Bermuda grass? In-depth analysis is here!

Many people know glyphosate works against bermuda grass. But the results depend on several factors. Application rate matters. Spray formulation matters. Timing matters. Repeat treatments matter too. Here’s what I’ve learned about using glyphosate to control bermudagrass:

Glyphosate: A “star product” in the weed control industry

Glyphosate is a widely used broad-spectrum, systemic and translocation herbicide worldwide. Its core advantage lies in that it can be absorbed by plant leaves and then transported to the root system, stems and other parts of the body through transport tissues, inhibiting the activity of 5-enolacetone shikimate acid-3-phosphate synthase (EPSPS) in plants and blocking the synthesis of aromatic amino acids. Ultimately, it leads to the overall death of the plant, achieving the effect of “uprooting the grass”, which is also the key difference between it and the contact herbicides that only act on the surface.

The Weed Control Effect of Glyphosate on Bermuda Grass:

1. Experimental data and case support

Multiple field experiments have shown that glyphosate has a significant effect on the prevention and control of Bermuda grass when used correctly. As shown in an experiment conducted by a certain agricultural research institute, during the tillering stage of Bermudagrass, when 41% glyphosate isopropylamine salt SL (diluted at a ratio of 1:50) was sprayed, the plant mortality rate reached 89% after 14 days, and the root rot rate exceeded 80% after 30 days. A case of a certain golf course also confirmed that after applying glyphosate in spring (March to April) for two consecutive years, the incidence of Bermuda grass on the lawn dropped from 35% to 6%.

2. Key factors influencing the effect

Influence Factor	Optimum Condition	Explanation of Effect Impact
Application Period	Spring tillering period/autumn vegetative growth period (temperature 15-28℃)	High or low temperatures will reduce the absorption efficiency and the dormant period will be ineffective
Agent Concentration	41% glyphosate IPA SL diluted at 1:40-1:60 (for mature plants)	A concentration that is too low only inhibits growth, while a concentration that is too high can easily pollute the soil
Application Method	Spray evenly and keep the leaves moist without dripping water	Missed spraying can lead to local recurrence, while re-spraying is likely to cause phytotoxicity
Additive Dosage	Combined with 0.1% nonionic surfactant	Enhance the adhesion of the liquid medicine, with the effect increased by 20% to 30%

Key points to note when using glyphosate

1. Safety Usage Guide

When using glyphosate, safety issues cannot be ignored. Operators must wear protective equipment such as protective clothing, gloves, masks and goggles. The protective clothing should be of long-sleeved and long pants style, and the material should have certain waterproof and anti-permeation performance to effectively prevent glyphosate solution from coming into contact with the skin. Choose rubber gloves that are resistant to chemical corrosion to ensure that the skin on your hands does not come into direct contact with the agent. Masks should be capable of effectively filtering out chemical particles in the air to prevent operators from inhaling them into their respiratory tracts, which could cause respiratory discomfort or poisoning. Goggles can protect the eyes from being splashed with chemicals.

During the operation, always be careful to avoid the agent coming into contact with the skin and eyes. If contact occurs accidentally, rinse immediately with plenty of water and seek medical attention promptly. It is strictly prohibited to eat, drink or smoke at the application site to prevent accidental ingestion of glyphosate. Once glyphosate is accidentally ingested, it may cause serious damage to the digestive system, nervous system and other parts of the human body.

After use, the sprayer should be cleaned in a timely manner. First, rinse off the residual liquid on the surface of the sprayer with clean water, then thoroughly clean it with an appropriate amount of detergent, and finally rinse it clean with clean water. After drying, store it properly to avoid the residual liquid affecting the next use and prevent the sprayer from being corroded and damaged.

2. Environmental and Plant Impacts

The use of glyphosate may have certain impacts on the surrounding environment. It is a non-selective herbicide that not only affects target weeds such as Bermuda grass but may also cause damage to non-target plants. During the application of pesticides, special attention should be paid to avoiding the drift of the pesticide solution onto nearby crops, flowers, trees and other beneficial plants, so as not to affect their growth and development and cause unnecessary economic losses. To minimize this impact, it is advisable to apply the pesticide on windless or slightly breezy days and, at the same time, use a directional spray device to apply it to the Bermuda grass precisely.

After glyphosate enters the soil, although it will combine with metal ions such as iron and aluminum and lose its activity, if it is used in large quantities for a long time, it may still have a certain impact on the community structure and activity of soil microorganisms. Soil microorganisms play a significant role in soil material cycling, nutrient transformation and maintaining soil fertility. Glyphosate may inhibit the growth and reproduction of certain beneficial microorganisms, disrupting the ecological balance of the soil. Therefore, it is necessary to reasonably control the dosage and frequency of glyphosate application to avoid excessive impact on soil microorganisms.

In addition, glyphosate and its metabolites may also enter water bodies through rainwater erosion, surface runoff and other means, posing potential hazards to aquatic organisms. For instance, glyphosate may affect the photosynthesis and growth of aquatic plants, and may also have adverse effects on the survival and reproduction of aquatic animals such as fish and shrimp. Therefore, when using glyphosate in areas close to water sources, extra caution should be exercised to prevent the agent from entering the water. Buffer zones can be set up around the application area to intercept any possible loss of the agent.

Analysis of Practical Application Cases of Glyphosate

In practical applications, there are both successful and failed cases of glyphosate’s herbicidal effect on Bermuda grass. These real cases provide us with valuable practical experience. ​

On a certain farm, growers found that large areas of farmland had been occupied by Bermuda grass, which seriously affected the growth of crops. During the vigorous growth period of Bermuda grass, that is, in spring, they chose a windless sunny day and, in accordance with the requirements of the product manual, diluted glyphosate to an appropriate concentration and used a large-scale spray device to evenly spray the Bermuda grass. After applying the pesticide, they closely observed the growth of Bermuda grass. About a week later, the leaves of the bermudagrass began to turn yellow and wither, and the stems gradually became soft and fell over. Two weeks later, the above-ground parts of the Bermuda grass were basically dead, and the underground rhizomes were also severely suppressed, making it difficult for them to sprout again. After this treatment, the Bermuda grass in the farmland was effectively controlled, the growth environment of the crops was improved, and the yield also increased significantly. In this successful case, the correct application timing (the vigorous growth period of Bermuda grass in spring), suitable environmental conditions (windless and sunny days), and accurate dosage concentration control enabled glyphosate to fully exert its herbicidal effect and achieve the ideal herbicidal result. ​

In another case, a gardener found that Bermuda grass was spreading in his own garden and bought glyphosate by himself to remove the weeds. He didn’t read the product manual carefully and, on a hot and humid midday in summer, randomly increased the dosage of glyphosate for spraying. As a result, not only was the Bermuda grass not effectively removed, but some originally healthy flowers and ornamental plants around were also affected by the pesticide, with their leaves turning yellow and curling. This is a failed case. During the hot summer noon, the stomata of Bermuda grass close, reducing its absorption capacity for glyphosate. Moreover, the high temperature makes glyphosate more prone to photolysis, lowering its efficacy. Arbitrarily increasing the dosage not only fails to enhance the weeding effect but also causes harm to non-target plants. Moreover, it may lead to excessive glyphosate residue in the soil, exerting adverse effects on the soil ecological environment. ​

Another case occurred in an orchard. The orchard owner used glyphosate in autumn to remove the Bermuda grass in the orchard. However, due to uneven spraying, the Bermuda grass in some areas was not sprayed with sufficient pesticide. After some time, the Bermudagrass that had not been fully sprayed with pesticides grew again, posing a threat to the growth of the fruit trees once more. This case demonstrates that the uniformity of the spray is crucial to the herbicidal effect of glyphosate. If the uniform coverage of the herbicide cannot be ensured, the goal of thorough removal cannot be achieved.

Conclusion: Make scientific choices and effectively control weeds

Glyphosate can effectively eliminate Bermuda grass, but its effectiveness is affected by factors such as the application period and concentration, and safety regulations must be strictly followed.  When there is a large-scale and severe invasion, the rational use of glyphosate in combination with subsequent replanting can achieve the best grass control effect. Maintainers need to combine the actual scene and scientifically combine prevention and control measures in order to maintain the health of the lawn in the long term.