November 2020 - 9
Despite this, spotted lanternfly populations
within the biopesticide plots did not differ
significantly from the control groups.
" These results were disappointing,
but several factors could have affected
the results, including the life stage of the
pest, " Jenkins said. " At Blue Marsh, the
focus was on early-stage nymphs, which
constantly move from place to place.
This circumstance made it challenging to
measure both initial populations and death
rates in the plots treated with the sloweracting
biopesticides. "
At the time of the study in Norristown,
Walsh noted, the spotted lanternflies
were late-stage nymphs and adults; both
remain in the same place for days or weeks
while feeding, making it easier to target
applications and document mortality rates.
" We knew that nymphs are in nearconstant
motion, but it appears they
are moving farther and faster than we
thought, " he said. " We suspect that some
of the infected nymphs left the research
plot before their demise. That is one of
A spotted lanternfly adult and nymphs on a tree branch in Reading, near The Pagoda
landmark. Photo: Steve Ausmus/USDA-ARS
the issues we are reviewing, as well as
optimal environmental conditions and
application timing. "
Roush said the scientists would apply
the lessons learned at Blue Marsh to
future research.
" We are striving for an organic form
of spotted lanternfly control but need
to have an enhanced understanding of
circumstances under which it will be
most effective, " he said. " In the meantime,
our partners at the state Department of
Agriculture and the U.S. Department of
Agriculture have gained some valuable
information that is guiding how they
approach the problem, particularly in
satellite populations. "
Among the more than 50 scientists
involved with the study from Penn State
were Dennis Calvin, associate dean
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and director of special programs in the
College of Agricultural Sciences; David
Biddinger, tree fruit research entomologist
based at the Fruit Research and Extension
Center in Biglerville; John Rost, lab
supervisor for biology and horticulture at
the Center for the Agricultural Sciences
and a Sustainable Environment at Penn
State Berks; Kelli Hoover, professor of
entomology, Joe Keller, postdoctoral
scholar in entomology; Heather Leach,
entomology Extension associate and
scientists from Penn State's Center for
Pollinator Research.
Project partners also include the
U.S. Army Corps of Engineers, Blue
Marsh Lake Project; Pennsylvania Game
Commission; Pennsylvania Department
of Conservation and Natural Resources;
U.S. Department of Agriculture; and the
Pennsylvania Department of Agriculture.
Jillian Stevenson, associate director of
communications and alumni relations for
Penn State University, also contributed to
this article. FGN
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November 2020
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