Last fall, an infestation of Japanese stiltgrass
(Microstegium vimineum) was found in Johnson County Iowa. This represents that first time this species has
been found in that state and the furthest Northwest it has been found.
Even though stiltgrass is an annual plant that ‘comes on’
primarily in the summer, it can still be identified this time of year by the
thatch. New germinates will start in
late spring / early summer.
Below is a link to a document on the identification of
stiltgrass that you might find useful –
Lastly, if you do know of or find infestations of stiltgrass
in areas that are not indicated on this map, please enter
the record into EDDMapS at www.eddmaps.org.
Just from looking at the map, I would
think the Mississippi River corridor between Illinois and Missouri is a prime
spot to find new infestations.
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