Japanese stiltgrass in lawn

Asked July 14, 2017, 12:05 PM EDT

Japanese stilt grass has invaded our yard (hundreds of square feet). We are thinking of purchasing Acclaim Extra (Fenoxaprop) to use with a surfactant, as was recommended in an online search. We were wondering about using a pre-emergent chemical, which was also recommended. Do you know about effectiveness of this treatment,or would you recommend an alternative? Is there anything we can do that has less impact on the environment? We are going to start to introduce zoysia and know we will have to overseed. Thank you, we appreciate your help.

Montgomery County Maryland

1 Response

There are post emergent herbicides labeled for stiltgrass, however, we do not have research on their effectiveness. Look at the link from Rutgers for post emergent control and herbicides. https://njaes.rutgers.edu/pubs/fs1237/

See our link on stiltgrass. The most effective control are the pre emergent herbicides without a nitrogen fertilizer in the spring http://extension.umd.edu/hgic/japanese-stiltgrass

Maintain a healthy, dense turf that can compete and prevent weed establishment. Test your soil if not done in the last several years and overseed with tall fescue and fertilize this fall. http://extension.umd.edu/hgic/soils/soil-testing

You did not mention the type of grass that you have. You will have to decide.
Turf type tall fescue is the recommended cool season turf grass that grows best in full sun to partial shade.

Zoysia is a warm, season grass that grows best in full sun. It goes dormant in the winter. It can also spread to nearby yards and would be difficult to contain/control. Zoysia cannot be started from seed. It is started from plugs or sod during the growing season not in the fall. Look at the above publication for pros and cons.