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spotted lanternfly range map

Map image of the United States east of Indiana and north of South Carolina. A key on the right is labeled "GDD (Bt = 10.4 degrees C)," with a set of color boxes labeled with numbers. The top box is deep blue, labeled "3000." On the map, deep reds are found in North Carolina, with oranges and yellows throughout the mid-Atlantic and Ohio. Blues appear in the Appalachian mountains in West Virginia, Virginia, and even small pockets of western North Carolina. More blues are found in northern Pennsylvania, upstate New York, northern Connecticut, western Massachusetts, and throughout Vermont, New Hampshire, and Maine. Southern New England is mostly pale yellow and pale green.

As the invasive spotted lanternfly (Lycorma delicatula) continues to expand its range in the eastern U.S., a new study on the temperatures it needs for progressing through its life cycle offers a clearer picture of where the spotted lanternfly is likely to thrive—and where it’s not. Researchers at Penn State University studied the relationship between the spotted lanternfly’s development cycle and temperature and then applied that to climate data across the northeastern U.S., as shown here. Areas shaded in blue, corresponding to approximately 1,000 accumulated “degree days” and below, are unlikely to sustain average seasonal temperatures for spotted lanternfly to complete its full growth and reproductive cycles. (Figure originally published in Calvin et al 2023, Environmental Entomology)

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