They can be made from the time leaves are fully expanded until fall color develops.
The combination of convenience and smaller quantity make this type of product suitable for many acreage owners.įoliar applications require complete coverage of the plant canopy to provide consistent control. Pathfinder II is a ready-to-use formulation of triclopyr for basal applications that does not require dilution.
Garlon concentrate is available in 2.5 gallon containers that may be more than required for many users. A mix of 20 ounces of herbicide in one gallon of oil based carrier is effective against most species. Garlon 4) should be used for basal bark treatments because it is oil soluble (important when mixing with oil) and esters penetrate bark more effectively than amine formulations such as Garlon 3A. Triclopyr is effective against most invasive woody species, and is sold under the tradenames of Garlon, Remedy Ultra, Tahoe and Tailspin. Several herbicides are labeled for basal bark application and their effectiveness varies with target species. The bark should be thoroughly wetted with the spray, but applying until runoff is not necessary. Trees can be treated any time of the year, but the stems must be dry at the time of application. Basal applications are most effective on trees with a diameter less than four to six inches since the bark on larger trees may reduce herbicide absorption. Dyes formulated for basal applications allow the applicator to easily see coverage of the target and if excessive off-target spray is occurring. The herbicide is applied using an oil based carrier (diesel fuel, kerosene, bark oil) to increase movement of the herbicide through the bark. Caution is required with this product since picloram can be absorbed by roots of adjacent trees and plants, resulting in significant injury.īasal bark applications involve applying herbicide to the lower 12 inches of stems and trunks. Tordon RTU (picloram) is a premixed formulation for cut surface treatments. Use only concentrated formulations with at least 40 percent active ingredient for cut surface applications.
Roundup (glyphosate) at a 50 percent dilution (one part Roundup to one part water) is effective against most species. Herbicides can be painted onto the surface or applied with a squirt bottle or small sprayer. For larger trees, the herbicide only needs to be applied to the cambium, the tissue directly underneath the bark. The herbicide should be applied shortly after cutting while the wound is still fresh. Three distinct types of herbicide treatments are commonly used to control woody plants.Ĭut surface applications are used to prevent resprouting after mechanical removal of the woody plant. In many situations, herbicides provide the most effective and economical control option. Non-chemical control tactics include pulling, mechanical removal and repeated mowing. Three common Iowa invasive woody species are buckthorn, honeysuckle and multiflora rose. Disturbances within Iowa’s natural areas make them susceptible to invasion by exotic woody plants.
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