Stevens (2002) states that the potential for large-scale restoration of wildlands infested with L. cuneata is probably low, unless the entire area is continually treated for several consecutive years. Complete elimination of L. cuneata is difficult. If control efforts are applied when the infestation is still minimal, the potential for successful restoration is moderate to high.
Preventative measures: In the USA, the increasing range of L. cuneata can be slowed if it is no longer sold or planted as erosion control along highways or around reservoirs. Its use as a forage plant should also be halted. Listing of L. cuneata as a noxious species will facilitate stopping its spread.
Chemical: Spraying can kill mature plants, but large numbers of viable seeds can remain in the seed bank for several years. Pastures and rangelands must also be monitored for several years to determine if it is completely destroyed. Disturbed areas have a high potential for invasion by this weed. Plants are difficult to identify in the first year of growth and can develop into large stands before they are noticed. It is difficult to find and spray all the plants in an area.
Most current management procedures require the use of herbicides to control the growth and expansion of L. cuneata. Metsulfuron methyl (Escort®), triclopyr (Garlon®), clopyralid (Transline®) and glyphosate (RoundUp®) are some herbicides that are known to control this invasive. Herbicide should be applied early to midsummer, during the flower bud stage. A 2% triclopyr solution or a 0.5% clopyralid solution is effective in controlling L. cuneata during the vegetative stage prior to branching or during flowering. In wet sites, a 2% solution of an aquatic-approved glyphosate formulation (Rodeo®, Aquamaster®) is effective from early summer until seed set (Remaley 1998, in Stevens, 2002).
Integrated management: The best control method combines both mechanical and chemical treatments. Hand pulling is impractical due to its extensive perennial root system, but mowing plants at the flower bud stage for two to three consecutive years can significantly reduce the vigor of stands as well as control further spread. Mowing followed by an herbicide treatment is likely the most effective option for the successful control.
Prescribed burning, by itself, does not control populations of L. cuneata. Spring burns actually stimulate resprouting and encourage seed germination. Even so, prescribed burns applied late in the season and in combination with other control methods can help control L. cuneata. Late season burns decrease mature plant vigor, remove that year’s seeds, and decrease seedling survival. Following a late season burn, herbicide can be applied, then mowed for good control results.