Roadside vegetation managers have much to accomplish during the spring and summer months. There are not enough mowers, funding or time to maintain every acre along our highways. Selective herbicide roadside applications provide a great solution to this problem.
THE ISSUE
Mowing is a short-term answer to vegetation management. It provides temporary vegetation uniformity and improved aesthetics. However, this comes at a high price, is labor intensive and is the least efficient method to cover large areas.
Broadleaf weeds tend to respond quickly after mowing and are some of the tallest non-woody vegetation on roadsides. They can reach two to three feet tall within a few weeks. This can block visibility and quickly becomes an eyesore.
Invasive plants are a huge issue. Many of the most rapidly spreading invasive plants are broadleaf weeds like wild parsnip, Blessed, Plumeless, Musk, Bull, Russian and Canada thistle, Giant hogweed, cocklebur, curly dock, marestail, kochia, witchweed, wild mustard and garlic mustard. Mowing temporarily reduces height growth but does not impact seed production or growth of the root system.
RESEARCH
Purdue University published a comprehensive report on Integrated Vegetation Management for the Indiana Department of Transportation. This report shows that one selective weeding cost 43% less per mile than one mowing. In practice this difference would be higher given more than one mowing is typically performed. Another benefit of selective weeding was that production increased from 18.5 miles per day for mowing to 60 miles per day for herbicide application.
BENEFITS
Spring selective herbicide applications provide numerous advantages, notably decreasing the mowing workload and boosting overall productivity. By managing broadleaf weeds, vegetation stays uniform for a longer period, resulting in a more consistent and appealing appearance. Furthermore, controlling these weeds improves turf health by freeing up essential resources like sunlight, water, and nutrients, allowing the turf to flourish. Fewer trips along roadsides also lead to enhanced safety, as applying herbicides on steep backslopes reduces the risk of mower-related accidents.
EFFECTIVE HERBICIDE PRODUCTS
Historically, active ingredients like 2,4-D, dicamba, and MCPP were used to control roadside weeds. Today, products like TerraVue and Method offer less volatility, longer-lasting effects, and broader weed control. These products can even control small woody plants (<2 feet tall) in the sprayed area, helping prevent future issues.
KEYS TO SUCCESS
For successful herbicide application, it is crucial to select the most effective products tailored to the task at hand. Timing is also essential; applying selective herbicides one week after mowing can significantly enhance absorption. To achieve the best results, it’s important to target weeds during their active growth phases. Ensuring thorough coverage by using 10 gallons per acre is key, and utilizing computer-controlled spray systems helps maintain precise application rates. Regular calibration of equipment is necessary to sustain effectiveness, and continuously monitoring outcomes ensures the success of the herbicide application process.
Azelis A&ES has experienced representatives that can help you make the right decision for your land management objectives. We are ready to provide you with a safe and effective solution. Talk to one of our technical experts to get started today!