—Lancaster Farming, Saturday, March 13,1971
26
Plant Pathologist Warns of Blight
The nation faces another epi
demic of Southern Leaf Blight
of corn if the country’s seed
corn industry continues its shift
to presumably resistant male
stenle cytoplasm, according to
a plant pathologist at Pennsyl
vania State University.
Dr. Richard R. Nelson said
Penn State tests show that
corn inbred lines with C and S
male-sterile cytoplasm soon
to be used widely in producing
hybrids have no resistance to
strains of the leaf blight fungus
currently existing in the U S.
and throughout the world.
The shift to C and S male
sterile hybrids has started, ha
said, because of the extreme
susceptibility of corn hybrids to
Texas (T) male-sterile cyto-
Folks are
finding
out about
Purina’s
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FARROW
CHOW...
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the sow’s n
at farrowi
Purina Farrowing Chow is the result of five years of
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This 14% protein ration, containing grain, is fed as
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•iicg Trademark—Hess Sc Clark
John J. Hess, 11, Inc.
Ph: 442-4632
Paradise
West Willow
Farmers Assn., Inc.
Ph; 464-3431
West Willow
John B. Kurt*
Ph: 354-9251
R. D. 3, Ephrata
plasm. Seed producers are
aware of the susceptibility of T
male-sterile cytoplasm to South
ern Leaf Blight. However, the
Penn State tests are the first to
reveal the lack of blight resist
ance in C and S male-sterile m
breds.
Seed corn producers develop
hybrids with male-sterile cyto
plasm the germ plasm in
living cells to avoid the need
to detassel male plants by hand.
Such a procedure saves the seed
producer about $6O an acre in
labor costs.
“Until further research iden
tifies the resistance of certain
inbred lines of corn with C
male sterile cytoplasm, the
seed industry should not rush
headlong into converting the
fro. B. Landis
Ph: 394-7912
1912 Creek Hill Ed.. Lane,
James High & Sons
Ph: 354-0301
Gordonville
Wenger's Feed Mill
x s\ N
Inc.
Ph: 367-119 S
Rheeras
nation’s corn hybrids into C
male-sterile cytoplasm,” he cau
tioned. “The time to fight an
endemic is before it occurs ”
While not a new plant dis
ease, Southern Leaf Blight of
corn never has posed a serious
threat to corn hybrids produced
with normal cytoplasm. The
Penn State scientist believes
that normally produced hybrid
corn, using non-male sterile in
breds, has sufficient blight re
sistance to keep the disease un
der reasonable control.
“Thus far, none of the fungus
strains that blight all of the
male-sterile cytoplasms produce
a similar blighting on corn lines
containing normal cytoplasm,”
Dr. Nelson stated.
He indicated the seed indus
try is increasing production of
C-raale sterile inbred corn all
over the world. He claimed the
seed industry should be alerted
to the fact that such inbred
corn lines are not resistant to
certain races of Southern Leaf
Blight fungus.
“If the use of hybrid seed
with normal inbreds prevents
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Lancaster. Pa. Eheems. Pa.
Danger to C and S Con
another blight like the one of well worth the extra cost of pi
this past season, it would be ducing it, he affirmed.
Roy H. Bucli, Inc.
Epbrata, BD. 2
Grumelli Form Service
Nissley Form'Service
Washington Boro. Pa.
Quarryviile, Pa.
n