Lanternflies: The Grownups Are Here
August 9th, 2022
Though the spotted lanternfly has been annoying a lot of central-Pennsylvania gardeners for two or three years now, not everyone has experienced the misfortune yet of hosting this new Asian import in their yard.

Spotted lanternflies often congregate in numbers like these.
Credit: Penn State Extension
Be ready. You may be about to meet them for the first time.
Lanternflies morph into their adult form starting in late July and really become noticeable in August and September.
This is when they become gray flying insects, about the size of a pinky tip, with black spots on the wings. When they go to fly, they open a second set of wings that reveal a distinctive red-orange color with black spots.
Although they don’t technically “swarm,” they do tend to show up in rather large masses – enough to almost blanket the ground in some cases.
One oddity about their behavior is that they can be really numerous in one area one year but then seemingly disappear the next. Or they’ll be all over one neighborhood but not in another one nearby.

Three different life-stage looks of the spotted lanternfly.
Credit: Penn State Extension
I think that a lot of gardeners/yardeners are going to experience adult lanternflies for the first time this year because a lot of people earlier this summer were wondering about strange new little crawling and hopping black bugs with white spots.
A few weeks ago, the mystery was little crawling/hopping red bugs with white spots and black trim.
Both of these were the nymphal stages of the grownup lanternflies we’ll be seeing this month.
Since the nymphs don’t look much like adult lanternflies, it’s no wonder first-timers didn’t make the connection. But once you’ve seen the nymphs and the adults in action, both stages are pretty memorable.