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By Ryan McGeeneyU of A System Division of AgricultureApril 29, 2016
(Newsrooms: additional art available at https://flic.kr/s/aHskzeroMv)
LITTLE ROCK — Kudzu bugs, silently building their numbers since 2014, are now poised
to be a threat to the state’s soybean crop.
Gus Lorenz, extension entomologist for the University of Arkansas System Division
of Agriculture, said he and his staff have received reports of the pests from northeastern
Arkansas, including Poinsett, Mississippi and Crittenden counties. Lorenz said the
insects were found during pest sweeps of test plots at the Division of Agriculture’s
Lon Mann Cotton Research Station in Marianna in recent days.
Since their initial detection, the pests have primarily remained in kudzu, although
they were found in soybeans in non-damaging numbers in 2015. Lorenz said that in 2016,
however, the bugs will likely pose a threat to the crop.
“We’re expecting to see damaging levels this year,” Lorenz said. “Last year, they
never rose to the treatment threshold, but this year, we’re seeing them a lot more
frequently, and they’re increasingly moving from kudzu to soybeans as they seek a
Adult kudzu bugs are olive green to brown with a box-like shape, similar to a ladybug.
Newly hatched nymphs are orange, about the size of a pinhead, and stay close to the
eggs, while older nymphs are green, oval-shaped and hairy.
Adult kudzu bugs are olive green to brown with a shape similar to a ladybug. Newly
hatched nymphs are orange, about the size of a pinhead, and stay close to the eggs,
while older nymphs are green, oval-shaped and hairy.
The kudzu bug feeds on plant sap, which it sucks from the stems of kudzu, soybeans
and other related plants. Kudzu and soybeans are the most important hosts, although
they will also develop on closely related legumes such as edamame and black-eyed pea.
Adults often congregate on wisteria and some edible beans, but the survival of nymphs
is low on these plants. Peanut, alfalfa and clover are not hosts.
Large numbers of immature kudzu bugs can cause yield losses in soybeans, and adults
can be a nuisance if they enter homes in the fall in search of a place to spend the
The treatment threshold for kudzu bugs in soybeans is the detection of one nymph per
sweep. Kudzu bugs in soybeans can be controlled with pyrethoid insecticides, although
Lorenz cautioned that growers should not apply the pesticide before the insects are
detected in threshold levels.
If you treat them as soon as you find a single nymph in an entire field, you’ll just
have to go out and treat them again,” Lorenz said. “When you treat with pyrethoids,
you open the door for other pests, because you’re also killing all the beneficial
insects. With this particular bug, you just want to wait.”
A native of Asia, Kudzu bugs were first discovered in the United States in 2009. In
2014, the bugs were found in Crittenden County and in 2015, had spread to six other
counties in Arkansas: Mississippi, Lee, Ashley. St. Francis, Phillips and Poinsett.
For more information on pest management, visit www.uaex.uada.edu, http://arkansascrops.com or contact your county extension office.
The University of Arkansas System Division of Agriculture offers all its Extension
and Research programs and services 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 Division of AgricultureCooperative Extension Service(501) firstname.lastname@example.org