Spotted lanternflies increase in population and are moving towards wine-producing regions.

Philadelphians have experienced relatively mild infestations from the invasive spotted lanternfly (Lycorma delicatula) since its first sighting in 2018. However, experts caution that this perception may be misleading, as the threat posed by these pests is far from diminished. The resurgence of lanternflies in other regions of Pennsylvania has the potential to impact local crops and heighten the urgency for continued public vigilance against this invasive species.

Initially discovered in Berks County a decade ago, lanternflies have shown fluctuating population patterns over the years. Julie Urban, an entomologist at Penn State University, noted that while populations appeared to decline after their initial years of feeding—likely due to depletion of host plants—these insects have recently re-emerged in significant numbers. Urban affirmed that this resurgence is not unexpected, given the cyclical nature of their feeding habits.

As these pests expand their territory, concerns grow particularly for the agricultural sector. Erie County, Pennsylvania’s largest grape producer, is now on high alert as lanternflies encroach from neighboring regions. With grape production in Erie largely focused on juice and jelly—products that yield lower profit margins than wine—local growers will find it increasingly challenging to mitigate the economic impact of an infestation. Insecticides, currently the primary means of controlling spotted lanternfly populations, present additional financial burdens for these growers, many of whom lack the necessary resources to implement and sustain effective pest management strategies.

Meanwhile, although lanternflies have not yet reached the West Coast, experts predict their inevitable spread within the next decade. Pennsylvania’s proactive “Stomp It!” campaign encourages residents to actively combat these pests by destroying them upon sight, particularly on vehicles and goods that could facilitate further dissemination.

Scientists are exploring various control strategies, including the potential deployment of parasitic wasps, which target lanternfly populations. While this method shows promise, extensive research is necessary to ensure these wasps do not unintentionally harm native crops and wildlife.

In the face of ongoing lanternfly infestations, much of Pennsylvania remains under quarantine. The state’s agricultural specialists emphasize the importance of killing any spotted lanternflies encountered to prevent their spread and help sustain the livelihoods of local farmers. Public awareness and proactive measures are crucial as the lanternfly threat evolves and encroaches further into agricultural regions.