CORN TALK
(Continued from Page 1)
Southeast Pennsylvania
Crops Conference, Mont
gomery County 4-H
Center, Creamery.
Cumberland County Crops
Day, Penn Township Fire
Jjall, 9 a.m.-2:30 p.m.
Southeast Pennsylvania
Crops Conference, East
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Farm Calendar
Brandywine Fire Hall,
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Adams County Crops Clinic,
York Springs Fire Hall,
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334-6271.
Pennsylvania Corn and Soy
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Franklin County Crops and
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Old Com Disease Causing
New Concerns In Ohio
WOOSTER, Ohio An
old corn disease has re
emerged in Ohio fields, rais
ing concerns of potential
problems it may cause if not
effectively controlled.
Northern corn leaf blight, a
fungal disease that can cause
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Lancaster Farming, Saturday, January 19,2002, Corn Talk-
PENNSYLVANIA MASTER CORN GROWERS ASSOC.. INC.
Pat Lipps, an Ohio State University
plant pathologist, said the disease
could potentially cause serious prob
lems and should be monitored closely.
“The cases we’ve been finding in Ohio
are not severe enough to be a major ep
idemic, but it’s enough to give us a
warning sign that we need to pay at
tention to this,” said Lipps.
Plant pathologists speculate the dis
ease has returned due to the planting
of corn hybrids that lack resistance.
“The best way to control the disease is
through resistance. It’s cheap and ef
fective. The farmer just needs to take
the time to work with seed companies
in choosing a resistant hybrid,” said
Lipps. “There are plenty of hybrids
available with good resistance.”
Northern corn leaf blight is more
common in fields throughout southern
Ohio due to the ample rainfall the
region received throughout the grow
ing season. Lipps said a number of
fields with higher disease levels are ex
periencing 10 percent to 20 percent
yield losses.
The telltale sign of northern corn
leaf blight is one- to six-inch long
cigar-shaped gray-green to tan-colored
lesions on the lower leaves. As the dis
ease develops, the lesions spread to all
leafy structures, including the husks.
The lesions may become so numerous
that the leaves are eventually de
stroyed causing major reductions in
yield due to lack of carbohydrates
available to fill the grain. Yield losses
can reach as high as 30 percent to 50
percent if the disease establishes itself
before tasseling.
Two types of resistant hybrids are
available to farmers to control north
ern corn leaf blight; partial resistant
hybrids, which protect against all four
of the known races of the fungus, and
race-specific resistant hybrids, which
protect against a specific race. Partial
resistant hybrids are the most
common. A one-to two-year rotation
away from corn and destruction of old
corn residues by tillage may be helpful
in controlling the disease if susceptible
hybrids must be grown.
For more information on northern
corn leaf blight, log on to Ohio State
Extension’s Ohio Field Crop Disease
at http://www.oardc.ohiostate.
edu/ohiofieldcropdisease. Ohio State’s
Ohioline at http://ohioline.osu.edu also
contains information about the disease
and how to choose effective hybrids.
significant yield losses under
wet weather conditions, has
been found in cornfields
throughout southern Ohio
this season. The disease was
last seen in Ohio during the
early 19905.
189