Non-native invasive species have had a dramatic impact on the forests of Pennsylvania.
Gypsy moth (oaks), hemlock woolly adelgid (eastern hemlock), and the bark scale
(American beech) have altered the forest ecosystems of Pennsylvania. In addition,
Pennsylvania forests are in imminent danger from the emerald ash borer (all ash
species), Asian longhorned beetle (maples and other hardwood species), and Sirex
noctilio (hard pines). Sirex noctilio was recently detected in Pennsylvania as the
infestation in central New York spreads. The forest pests mentioned above also can
affect agricultural resources in the nursery/landscape sector. Ash, oak and maple
species rank among the most popular and widely planted trees nationally. In addition,
exotic pests such as honey bee tracheal mite and varroa mite have had major impacts
on honey bee populations in the state. Non-native nematodes, exotic snails and other
invertebrates also impact our agricultural production. [Revised April 10, 2008]
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Coleoptera
(Beetles)
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Hymenoptera
(Ants, Bees, Wasps)
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Lepidoptera
(Butterflies, Moths)
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Hemiptera
(True Bugs)
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Acarina
(Mites)
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Other Invertebrates
(Worms, Snails)
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Species listed above are just some of the species that were mentioned in the
various Council
documents published in 2006 and this is not a comprehensive list of invasive
species in this group for
Pennsylvania.
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Whenever possible, we have linked to a Pennsylvania specific fact sheet or a federal
fact sheet.
For more information on Invasive Species of National concern visit the
National Invasive Species Information
Center website. See the Dichotomous Key beginning on page (v.) and
the Appendix C-Insect, Pathogen & Abiotic Advisories beginning on page (75.) of the
National Park Service Forest Insect Disease Rapid Response Plan.