This presentation at the Upper Midwest Invasive Species Conference, 2014, summarized some of our control work on invasive knotweed at Southwood Nature Preserve in

Foam Stream Targeting Invasive Knotweed

the Twin Cities Metro area.  It also briefly discusses use of our foam herbicide system by the Northeast Iowa RC&D where they have had success treating a large infestation of greater than 25 acres.  Finally, Washington State

Foam Herbicide Clinging to Knotweed Leaves

University did some testing this summer comparing our foam herbicide dispenser to traditional spraying techniques.  So far (and these results are very preliminary), the foam herbicide has performed better than the spray even though half as much herbicide was used on the plots where foam was applied.  The full presentation is online at: How to Kill Japanese Knotweed.

As soon as we get data from Washington State University on their testing of the foam system, we will provide a link or other information.