A contractor surveying for the PGE powerline called a couple years ago to alert me of Ludwigia in a pond on private property. He told the landowner to contact the SWCD for assistance, but I never heard from the landowners. I do not know what species this is, and have not seen the infestation myself. The contractor did say that the pond was not connected to any other water way.
Expert Reviewer
Mr. Vern Holm Director, Oregon Vegetation Management Association