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Control of prostrate knotweed (and crabgrass?) with preemergence herbicides this fall

Dr. Roch Gaussoin from the University of Nebraska-Lincoln posted on the Turf iNfo blog:

Prostrate knotweed is a summer annual broadleaf weed that
typically begins germinating in February in Nebraska. The weed is most common
in highly trafficked, compacted soils, and areas fitting this description were
hopefully cultivated and overseeded this fall to improve soil structure,
increase turf density, and reduce prostrate knotweed establishment next year.
If cultural management is not improved, this troublesome weed will return each
year.

See pictures and read more here