230
-Com Talk, Lancaster Farming, Saturday. March 3,2001
Crop Observation
(Continued from Page 21)
more prone to yield losses
from this leaf disease than
others due to the predominat
ing production practices and
environmental conditions.
Generally, the severity of the
disease is related to reduced
tillage, especially in fields
planted continuously to corn.
During years with exception
ally warm and humid
weather, gray leaf spot can
become important through
out the state as in 1995.
Control of the disease has
been achieved through the
use of resistant hybrids, til
lage to destroy corn residues
and adequate crop rotation
with soybeans, wheat or
forage crops. Where conser
vation tillage is used, a two
year rotation away from corn
is necessary because the
fungus survives in corn resi
dues left on the soil surface
for up to two years.
Fungicides are available
for use on corn to control
GLS, but the economics of
corn production have not
permitted common use of
these materials except on
sweet corn, pop corn or seed
corn. Fungicide applications
have been evaluated in Ohio
for control of GLS on field
corn. During the growing
seasons of 1996 through
2000, the yield response due
to fungicide application on
susceptible hybrids ranged
from two to 32 bushels per
See Binkley & Hurst Bros. Inc.
For Quality Stoneforks by
vreten[iO
Forks for Skid Loaders. Tractor
Loaders. Articulated Wheel Loaders
(The Original) Works Better
Made of Better Steel to Last Longer
Fi11...
The ridge between the tine tips and the con
tainer unit prevents collected stones from falling
out while new ones are being collected.
HR
BROS. INC. —' 0
133 Rothsville Station Rd.
P.O. Box 0395, Lititz, PA 17543-0395
(717) 626-4705 1-800-414-4705 Fax (717) 626-0996
acre. Obviously, the greatest
yield responses occurred
during years with highest dis
ease pressure (1996 = 27
bushels per acre, 1997 = 2
bushels per acre, 1998 = 32
bushels per acre, 1999 = 19
bushels per acre, 2000 = 2
bushels per acre).
There are two fungicides
labeled for control of GLS on
corn, Tilt 3.6 EC and Quadris
2.08 SC. Tilt (2.0 - 4.0-ounces
per acre) is labeled for control
of several foliar diseases
through end of silking (R 2
stage of growth). Quadris
Flowabale Fungicide recently
received a federal label for
control of several foliar dis
eases on corn at 6.2-9.2 fluid
ounce per acre applied at dis
ease onset, and can be until
HINES EQUIPMENT
1-800-245-6227
CHAMBERSBURG FARM
SERVICE
975 S. Main St.
717-264-3533
GEOE. V. SEIPLE &
SON, LCC.
1521 Van Buren Rd.
610-258-7146
seven days of harvest. Other
directions and restrictions
are described on the labels.
Both of these fungicides
are labeled for more than one
application during the grow
ing season, but due to the rel
atively low price of corn,
multiple applications during
the growing season is cost
prohibitive. In Ohio and
other states, two applications
of Tilt or Quadris has pro
vided better disease control
than one, but in most tests
there was no significant addi
tional yield benefit from the
second application. It ap
pears that the most economi
cal use of these products on
susceptible hybrids is a single
application. Tilt has provided
the best results when applied
at the Vl4 to R 2 growth stage
using the 4.0 fluid ounce per
acre rate. Quadris appears to
benefit from a slightly earlier
NAVIGATOR M Series Trailer Sprayer
ALTOONA
CRESSON. PA
CARLISLE. PA
CARLISLE FARM
SERVICE
260 York Road
717-243-4419
URG. PA
NEW HOLLAND. PA
ABC GROFF, INC.
110 S. Railroad Ave.
717-354-4191
mi HIWS
application. Apply Quadris
from VlO- Vl4 growth stage
using 9.2 fluid ounce per
acre. The label suggests that
an adjuvant be added to im
prove coverage. When using
ground equipment add drop
nozzles to improve coverage
of the leaves at and above the
ear. We recommend treating
susceptible hybrids; not hy
brids with some degree of re
sistance to GLS.
In several (though not all)
tests, Quadris provided supe
rior disease control to that
provided by Tilt. Thus, in
terms of efficacy against gray
leaf spot, Quadris may prove
NEWPORT. PA
H FARM EQUIPI
30 Aucker Rd.
717-567-3562
SMITI
:w r
ECKROTH BROS.
FARM EQUIPMENT
Rt. 443 & 895
570-943-2131
iREFIELD. PA
ECKROTH EQUIPMENT
4910 Kernsville Road
610-366-2095
RICHL
LEBANON VALLEV
IMPLEMENT
700 East Linden St.
717-866-7518
to be the better choice. How
ever, because Quadris is used
at an application rate over
twice that of Tilt, the per
acre cost of Quadris is about
twice as high as that of Tilt.
RIVER HEAD. NY
LaCORTE FARM & LAWN
EQUIP.
1241 Old Country Road
lENT
516-727-8700
D. PA
SHILOH. NJ
FARM RITE, INC.
122 Old Cohansey Rd
856-451-1368
PA