The Brief

Pennsylvania identifies 28 invasive insect species of greatest concern.

Some are already established (like spotted lanternfly, hemlock woolly adelgid, emerald ash borer).

Others pose emerging threats (Asian longhorned beetle, northern giant hornet).

The Commonwealth of Pennsylvania has cataloged 28 invasive insect species that threaten forests, agriculture and ecosystems – with many already spreading in Pennsylvania landscapes.

What we know:

According to the Pennsylvania Department of Agriculture, the "Insects of Greatest Concern" list includes 28 species. Some are already established and causing damage, while others haven’t yet arrived but are considered high-risk.

The state coordinates efforts through the Governor’s Invasive Species Council and has a statewide invasive

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