Beetle Pheromone Lures Both Sexes
BELTSVILLE, Md. Agricul
tural Research Service scientists
have discovered a pheromone
produced by male Colorado pota
to beetles but attractive to both
sexes that may lead to new en
vironmentally sound pest man
agement methods to protect pota
toes.
The Colorado potato beetle is
the potato crop’s most destruc
tive pest, costing growers millions
of dollars annually in crop losses
and expenditures for synthetic
pesticides.
The ARS scientists, led by en
tomologist Joseph C. Dickens
with the Chemicals Affecting In
sect Behavior Laboratory in Belt-
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sville, Md., reported their discov
ery in the July issue of the
Journal of Experimental Biology.
The Colorado potato beetle
rapidly develops resistance to
synthetic pesticides, many of
which are now being reevaluated
by regulators. The pheromone,
however, is a natural byproduct
of the beetle’s metabolism, so the
evolution of resistance to it is un
likely. Using the pheromone as a
natural chemical for luring and
killing the beetles may one day
lessen the amount of synthetic in
secticides required for pest con
trol.
For 75 years, scientists in the
United States, Canada and Eu-
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rope have searched for scents
that attract the Colorado potato
beetle. The generally accepted
view had been that a pheromone
attractant would be found in fe
males. Thus, the discovery of the
attractant in males provides a
new model for this beetle’s chem
ical communication.
Since 2000, Dickens has identi
fied several scents based on
chemicals in potato plants them
selves. Those scents were made
into the first experimental plant
lures to prove effective in field
tests.
Under a cooperative research
and development agreement with
ARS, Trece, Inc., of Salinas,
Calif., hopes to create prod
ucts based on the newly dis
covered attractants that will
exploit the insects’ own com-
munication system. New
products based on the tech
nology could include attracti
cides, or bait lures, formulat
ed with small amounts of
killing agents.
The scientists now will
conduct more tests to de
termine when and how prod-
ucts using the pheromone
based attractant will transfer
successfully from lab to field.
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