In seven years, the lanternfly has spread from Berks County, northwest of Philadelphia, to large areas of Pennsylvania and New Jersey, and both south and north. Penn State/E. Swackhamer

The invasive spotted lanternfly is spreading across the eastern US – here’s what you need to know about this voracious pest

The spotted lanternfly, native to Asia, is spreading fast since arriving in the United States seven years ago. An entomologist explains why this is a big problem.

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