—Lancaster Farming, Saturday. April 9, 1977
58
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ir
India wasp joins fight against bean beetle
ANNAPOLIS, Md. - Just
three years ago, Maryland
farmers were spending
$500,000 annually for
pesticide foliar applications
to protect their bean crops
from the ravages of the
voracious Mexican bean
beetle. Last year, says the
Maryland Department of
Agriculture, these farmers
maintained the same high
level of production while
reducing foliar application
costs to approximately
$50,000. This ac
complishment is directly
attributable to a highly
successful biological pest
control research program
Federally funded and un
dertaken by the University
of Maryland Agricultural
Experiment Station.
Now, says Maryland
Secretary of Agriculture
Young D. Hance, the results
of that laboratory and field
research are being applied
in a continuing pest
management program
conducted jointly by the
Maryland Department of
Agriculture and Maryland
Cooperative Extension
Service, with the
cooperation of the soybean
growers.
The University’s team of
entomologists demonstrated
that a tiny wasp, harmless to
humans and bearing the
tongue-twisting name,
Pediobins foveolatus, could
control the Mexican bean
beetle quickly and
dramatically. The insect,
native to India, preys on the
plant-eating beetle by
depositing its eggs on the
larva of the beetle. When the
eggs hatch, the larva of the
wasp destroys the beetle
larva. This is one way by
which nature can maintain
an ecological balance.
Convinced that laboratory
and field test results could be
duplicated in a viable pest
control program, the
University enlisted the
participation of MDA’s Pest
Management Section, which
has now implemented such
action. But, because the
wasp, native to a tropical
climate, cannot survive
Maryland Winter (beetles do
so by hibenating), NDA is
currently maintaing colonies
under greenhouse con
ditions. Later, at ap
propriate times during the
growing season, the agency
with the cooperation of
county Extension agents,
will tansfer colonies of the
parasitical insects to far
mers growing beans. And,
once established in the
fields, they will spread
rapidly to infest and reduce
the Mexican beetle
population.
Describing the program as
a “scientific breakthrough,”
Hance said that it holds
great promise for
Maryland’s important
soybean crop. Soybeans are
the State’s second mosl
valuable field crop, with ar
estimated value of more
than $46 million last year.
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