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resource managers and ecosystems ( Capers et al. 2005 ). Japanese knotweed was identified as the most problematic invasive plant with a mean rank of 4.6 ± 0.06. More than 80% of respondents ranked this plant in the highest two categories (4 and 5) and 63
( Alliaria petiolata ) are widespread in the natural resource areas and it would be difficult to eradicate these two invaders. The time line of introduction for louise’s swallowwort ( Cynanchum louiseae ) and japanese knotweed ( Polygonum cuspidatum ) is
. Manage. 5 165 178 U.S. Department of Agriculture 2021 The PLANTS database < http://plants.usda.gov > VanWallendael, A. Hamann, E. Franks, S.J. 2018 Evidence for plasticity, but not local adaptation, in invasive Japanese knotweed