"The Dirty Dozen": PA's 12 Worst Invasives
These are 12 species, of many, that are posing the most serious threats to the native plants, animals and natural communities of the natural landscape of western PA. WPC is focused on identifying and managing for these species on our natural areas. Please use the form to report any of these species on our natural areas.
Purple Loosestrife (Lythrum salicaria, L. virgatum and varieties)
Garlic Mustard (Alliaria petiolata)
Japanese knotweed (Polygonum cuspidatum and Fallopia japonica)
Bush Honeysuckles (Lonicera maackii, L. morrowii, L. tatarica and L. x bella)
Autumn Olive, Russian Olive (Elaeagnus umbellata and E. angustifolium)
Japanese stiltgrass (Microstegium vimineum)
Multiflora rose (Multiflora rose)
Mile-a-minute weed (Polygonum perfoliatum)
Eurasian water-milfoil (Myriophyllum spicatum)
Zebra mussel (Dreissena polymorpha)
Hemlock Woolly Adelgid (Adelges tsugae)
Gyspy Moth (Lymantria dispar)
For more information and photos, go to:
A List of Aquatic Exotic Animals & Plants
Invasive Species Initiative
Mid-Atlantic Exotic Pest Plant Council
DCNR Invasive Exotic Plant Tutorial