Fall is one of the best times for managing perennial and biennial weeds found in pastures or other areas maintained in perennial grass. As perennials prepare for the upcoming winter they move energy reserves from shoots to their perennial vegetative reproductive structures (e.g. rhizomes, perennial rootstocks). Systemic herbicides applied at this time are translocated along with the energy reserves to the reproductive structures, therefore providing more consistent control than applications made at most other times of the year.
Iowa State University
Hartzler, Robert G. and Anderson, Meaghan J. B., "Fall Weed Control in Pastures" (2019). Integrated Crop Management News. 2582.
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