[MAIPC] Fallopia japonica

[Judy Fulton]

I was recently sent the attached two photos of what looks like Fallopia 
japonica (aka Polygonum cuspidatum and Reynoutria japonica), which were 
taken in May. Apparently, the homeowners, whose property borders Back 
River in Baltimore County near Rock Creek Park, Maryland, are quite 
pleased with their decision to plant “Japanese bamboo” to reduce erosion.

I’m concerned because Fallopia japonica can live in salt environments, 
such as salt marshes. I’ve been informed that the mouth of Back River is 
at the southern edge of the fresh water zone of the Chesapeake Bay with 
average salinity of 6 ppt, but salinity can range from <1 ppt to 10 ppt 
depending on weather conditions.  I’m assuming that the pieces of 
rhizomes that might break off in a major storm could survive in Back 
River to colonize other areas, especially if the storm reduced the 
salinity in the river. Does anyone know if this is correct? Also, would 
the seeds remain viable if they were transported to another location by 
Back River?

If the homeowners were convinced to remove their Fallopia japonica, what 
would be the best way to eradicate it so near the water? Something like 
Rodeo plus a non-ionic surfactant?

Thanks for your advice.

Judy

____________________________________________

Judith P. Fulton
Consultant, University of Maryland Extension
Master Gardener, University of Maryland Extension
Chair, Maryland Invasive Species Council Subcommittee on Invasives Lists
410-337-3701
jfulton5 at gmail.com
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