These little black bugs with sporty polka dots are the earlier nymph stage of the spotted lanternfly (Lycorma delicatula), the pest that has invaded Pittsburgh by the zillions and is threatening to kill off our local population of Tree of Heaven (Ailanthus altissima), another invasive pest that is the spotted lanternfly’s primary host. Old Pa Pitt recalls an old Roman saying about the curse of an answered prayer that seems appropriate here.
Lycorma delicatula, a beautiful but destructive invader from China. Above we see the adult version; below are three views of the nymph in its late stage (an earlier stage looks similar, but black instead of red).
Allegheny County is in the Spotted Lanternfly quarantine zone, where these pests have become a serious problem. Their favorite host is the Tree of Heaven, otherwise known as Pittsburgh Palm or Tree from Hell (Ailanthus altissima), which is itself a beautiful but destructive invader from China. Spotted Lanternflies were unknown in the United States until 2014; now they are all over Pittsburgh. Although old Pa Pitt is inclined to say they can have as many Pittsburgh Palms as they want, these critters also cause damage to many other trees and vines. If you see one, you know what to do.
Here’s more about the Spotted Lanternfly from the Pennsylvania Department of Agriculture.
