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By Ryan McGeeney U of A System Division of AgricultureSept. 20, 2017
(412 words) (Download this story in MS Word here.)(See more pictures of the variable oakleaf caterpillar in action at https://flic.kr/s/aHsm9f1sUZ.)
LITTLE ROCK – As scourges go, the return of the variable oakleaf caterpillar is pretty
mild. But they do have a way of getting your attention.
Cooperative Extension Service agents throughout several southwestern Arkansas counties,
including Polk, Pike, Clark and others, began receiving calls earlier this week —
concern bordering on panic as large oak trees throughout the region began losing their
leaves, practically overnight.
“I’ve probably received 40 calls in the last two days,” Garland County agricultural
agent Allen Bates said Wednesday. “The caterpillars are infesting a lot of oak trees,
here in Hot Springs — the county courthouse called me up there this morning.”
The variable oak leaf caterpillar — so called because its color can vary widely from
one insect to the next — is now embarked on its annual feeding frenzy throughout much
of the Southern Plains, gnawing its way through oak leaves, and depositing its droppings
on sidewalks, porches and vehicles below. When the caterpillar is in sufficient concentrations,
the sound of this process can sometimes be mistaken for rainfall.
But it’s not.
Tamara Walkingstick, Associate Professor of Forest Resources at the University of
Arkansas System Division of Agriculture and Associate Center Director of the Arkansas
Forest Resources Center, said the caterpillars — a native insect to the region — typically
surge when trees are already going dormant for the year, and are an important link
in the ecological chain.
“There are a couple of different bird species that rely upon these insects for food,
including the pileated woodpecker and blue jays,” Walkingstick said. “So they’re not
beneficial to the trees, but they are beneficial to the other predators that utilize
these insects. They’re an important food source.”
The caterpillar’s other natural predators include parasites, ground beetles and stinkbugs.
While the caterpillar’s droppings may stain surfaces below, they pose no apparent
health risks to humans or pets. Walkingstick said that spraying insecticide on affected
trees was both unnecessary and logistically impractical, given the height of many
“People want to spray things, I know,” Walkingstick said. “But look: it’s going to
Within a few weeks, the last of the insects will have fallen from the trees to the
ground, where they naturally overwinter under the leaf litter, offering concerned
citizens a chance to exert a modicum of control.
“It’s a good opportunity to reduce the local insect population by sweeping up the
leaves and disposing of them,” Walkingstick said.
To learn about native insects, contact your local Cooperative Extension Service agent
or visit www.uaex.uada.edu.
About the Division of Agriculture
The University of Arkansas System Division of Agriculture’s mission is to strengthen
agriculture, communities, and families by connecting trusted research to the adoption
of best practices. Through the Agricultural Experiment Station and the Cooperative
Extension Service, the Division of Agriculture conducts research and extension work
within the nation’s historic land grant education system.
The Division of Agriculture is one of 20 entities within the University of Arkansas
System. It has offices in all 75 counties in Arkansas and faculty on five system campuses.
The University of Arkansas System Division of Agriculture offers all its Extension
and Research programs to all eligible persons without regard to race, color, sex,
gender identity, sexual orientation, national origin, religion, age, disability, marital
or veteran status, genetic information, or any other legally protected status, and
is an Affirmative Action/Equal Opportunity Employer.
# # #
Media Contact: Mary HightowerDir. of Communication ServicesU of A System Division of AgricultureCooperative Extension Service(501) firstname.lastname@example.org