—Lancaster Farming, Saturday, September 18,1971
16
DDT, Only Presently Known Control, Is Banned
Deadly Elm Tree Disease Is Found
A devastating disease of elm
trees has been found for the
first time in Pennsylvania.
Known as elm phloem necro
sis, the disease is caused by a
mycoplasm, an organism small
er than a bacterium, but some
what larger than most viruses.
It is spread from tree to tree by
the elm leafhopper.
The mycoplasm is injected
into the leaves as the insect
feeds, then moves down into the
roots and kills the inner bark
and cambium in the roots and
base of the tree. Many trees die
the year of infection, but those
infected late in the summer
may survive and die the fol
lowing year.
Infected trees tend to die all
at once, rather than branch by
branch, as elms suffering from
the well-known Dutch elm
disease. The foliage droops,
curls, and wilts, and takes on a
rather uniform yellow color. At
this stage the inner bark at the
base of the tree and in the roots
turns the color of butterscotch
If small pieces of this but
terscotch-colored bark are plac
ed in a closed jar for a few
minutes, an odor of wintergreen
can be detected. The color and
odor of the inner bark of dying
trees are specific symptoms.
As the infected trees con
tinue to decline, the leaves turn
brown and may remain hang
ing on the tree. At this stage the
inner bark becomes dark
brown Field examination is the
only way to determine if an
elm has phloem necrosis; there
are no means of laboratory
diagnosis
_ Elm phloem necrosis was
first discovered in Pennsylvan
ia near Jersey Shore, Lycoming
County, by a group of North
eastern forest pathologists on
a field trip.
Lester Nichols and William
Merrill of the Department of
Keep Broiler Output
Stable, (ISDA Advises
In the first quarter of 1972,
to keep broiler supplies near
the same per capita level as a
year earlier, broiler producers
should produce only two per
cent more broilers than they
did in the same period of 1971,
according to the US. Depart
ment of Agriculture.
USDA’s Consumer and Mar
keting Service makes this rec
ommendation in its “Broiler
Marketing Guide for the First
Quarter, 1972.” Broiler market
ing glides are issued quarterly
to help the industry plan pro
duction to meet the needs of
consumers and avoid an under
or over-supply and consequent
extremes in prices.
USDA also recommends that
the number of pullet chicks
placed for the broiler hatchery
flock be held at the same level
as a year earlier. If further im
provements in laying flock effi
ciency are obtained from the
use of Marek’s disease vaccine,
producers should reduce the
number of pullet chicks started
accordingly.
Copies of “Broiler Marketing
Guide for First Quarter 1972,”
PMG-22 which contains detail
ed information on the recom
mendations, will be available
soon from the Information Divi
sion, Consumer and Marketing
Service, U.S. Department of
Agriculture, Washington, D. C.
20250.
Instant Land Clearing
Heavy anchor chains towed
by tractors make quick work
of clearing scrub brush to
open up new acreage for
crops, pasture land or re
forestation, ~, > ,
i- » » « J v t i‘ y'jVv
» I • l <((•*••<
Plant Pathology at Pennsylvan
ia State University later found
the infection center at Jersey
Shore contained an estimated
1,000 dead or dying elms in an
area about three miles long and
about one-half mile wide, cen
tered along the new Route 220
bypass.
The disease has long been
prevalent throughout the South
and Midwest, from northern
Georgia to Arkansas, north to
central lowa and Ohio, and
from central Kansas and Ne
Roy H. Buch, Inc.
Epbrata, R.D. 2
Grumelli Farm Service i u. Brubaker
Quarryville, Pa. Lancaster, Pa.
\N. G. Myers Br Son
Rheems, Pa.
mm ni*inriTW GLEANER if an Aflls-ChalTiers trademark.
i44i11 « t | ; a
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\ • / * I, 1 * *,
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braska east to southwestern
West Virginia.
In subsequent surveys no
phloem necrosis-infected elms
were found in the following
counties: Centre, Huntingdon,
Blair, Somerset, Westmore
land, Fayette, Washington, Bea
ver, Lawrence, Mercer, Craw
ford, Erie, Warren, McKejan,
Cameron, Potter, Clinton, Brad
ford, Northumberland, and
Union. Other counties have not
been surveyed. The origin of
the isolated infection center in
Nissley Farm Service
Washington Boro, Pa.
.■* -y f
in Pa. for First Time
central Pennsylvania cannot be
explained. The leafhoppers
could have been brought in by
any one of several means, not
only from the west, but also
from the north, according to
Merrill and Nichols of Penn
State. Dr. Wayne Sinclair, De
partment of Plant Pathology,
Cornell University, recently
found elm phloem necrosis to
be widespread and epidemic in
LANCO BEDDING
FOR
POULTRY AND LIVESTOCK
• Wood Shavings Soft and Hard Wood
Call for information
Phone 285-4506
For good production next lactation,
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duction with a proven program of dry cow feeding.
They need Purina Dairy Conditioner, a research
proven ration to help give dry cows body condition
they need for good production after they freshen.
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Purina Dairy Conditioner is low-cost, too, because the
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Drop in soon and get your free copy of the
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John J. Hess, 11, Inc,
Ph: 442-4632
Paradise
West WiHow
Farmers Assn., Inc.
Ph: 464-3431
West Willow
John B. Kurtz
Ph: 354-9251
B. D. 3, Ephrata
the - Finger Lakes Region of
central New York.
The disease used to be con
trolled primarily by the applica
tion of DDT sprays to kill the
leafhoppers. Since DDT is now
banned, there is no research
proven control measure. Sani
tation by destruction of diseas
ed and drying elms is as impor
tant as it is for Dutch elm
disease.
Ira B. Landis
Ph: 394-7912
1912 Creek Hill Rd., Lane.
James High & Sons
Ph: 3540301
Gordonville
Wenger's Feed Mill
Inc.
Ph: 367-1195
Eheems