spotted lanternfly

As temperatures warm, Spotted Lanternfly (Lycorma delicatula) (SLF) eggs laid last fall will begin to hatch later this spring. The National Phenology Network is forecasting SLF egg hatch in North America based on growing degree day (GDD), base 50F. The map below was captured on Wednesday, April 2, 2025. You can continue to monitor the USA NPN website for SLF egg hatch at: https://usanpn.org/data/maps/forecasts/spotted_lanternfly

The spotted lanternfly (Lycorma delicatula) (SLF) continues make the news, both locally in Ohio, and across much of the eastern United States. While adult SLF are still active in Ohio, as a result of the warmer than average temperatures that we have been experiencing, numbers are appearing to decrease from earlier observations in the field. Freezing temperatures will kill the remaining adults that continue to feed, lay eggs and be a nuisance simply by their presences and the sticky sweet honeydew and the sooty mold that follows, and an agricultural pest that threatens vineyards and more.

Spotted Lanternfly nymphs have been confirmed emerging in Cincinnati today, April 24, 2024.