[MAIPC] update on spotted lanternfly's impact over time?

[Barringer, Dan]

While last year I thought that the leading wave was where it was worst, and it may still be, 2019 was a light year for us for spotted lanternfly (Northwestern Chester County, within an hour’s drive of the initial infestation in Berks County, and not far from Pottstown cited in the article below). But 2020 is proving to be a heavy nymph infestation again, more like 2018. So I am thinking it may not have a fading impact over time after all, but somewhat cyclical in pattern even if never reaching the initial wave’s numbers. We’ve definitely seen young black walnut trees severely impacted by it, severely disfigured. We didn’t have any ailanthus trees on the 621 acre preserve I manage, but as we grew this year to 712 acres we acquired a nearby grove which I treated with Garlon 4 and subsequently have begun cutting down (I checked first with Penn State researchers about making some into trap trees, but they did not need them for their research, and I wanted the ailanthus gone). This year the nymphs are heavy on these trees (even though they are now dead) but that may also be because there was Oriental bittersweet growing on them. While past nymph populations were heavy on walnut and grape, this year they are heavy on Oriental bittersweet and multiflora rose. Adults were previously heavy on Virginia creeper and red maple (and buildings and ourselves); I’ll be interested to compare the adults in September with previous years' patterns. I think it is difficult to make any generalization about the impact of this species at this time, other than to venture to say they are having some impact and they likely are here to stay.

Dan




Daniel Barringer (he/him/his)
Preserve Manager / Invasives Management Coordinator
Natural Lands
Crow's Nest Preserve
201 Piersol Road
Elverson, PA 19520
(o) 610-286-7955
(c) 484-368-9950
natlands.org
On Jul 17, 2020, at 2:37 PM, Stephen Hiltner <stevehiltner at gmail.com<mailto:stevehiltner at gmail.com>> wrote:

Can anyone offer insights into whether the lanternfly is causing increasing problems in areas where it has become established, or if its numbers are tending to fade into the background? Are there places where it's becoming entrenched as a big nuisance? A couple sources like the one below have suggested a fading impact over time.
https://www.pottsmerc.com/news/local/5-years-into-the-spotted-lanternfly-invasion/article_19edc06e-acaa-11e9-a4d0-e323ff09d976.html

We're having a few nymphs show up here in Princeton.

Steve
PrincetonNatureNotes.org<http://princetonnaturenotes.org/>
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