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Alligatorweed
(Alternanthera philoxeroides)
Found an invasive species? Register for a free login account, or submit a public report.
Hemlock woolly adelgid
Adelges tsugae Photo credit: Nicholas Tonelli
European woodwasp
Sirex noctilio Photo credit: © George Wilkinson/Flickr
Asian longhorned beetle
Anoplophora glabripennis Photo credit: Linda Hubley, United States Department of Agriculture
Gypsy moth (caterpillar)
Lymantria dispar Photo credit: Pixabay.com
Insects & Arachnids
Common: Species found in at least 1/3 of Pennsylvania counties.
Uncommon: Species found in Pennsylvania, but not widespread (i.e., found in less than 1/3 of Pennsylvania counties.)
Not present: Species not yet found in Pennsylvania.
Note: Species list updated in September 2021.
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