—Lancaster Farming, Saturday, September 23, 1972
16
Conquering
Quackgrass, the worst weed in
crops from New England to the
Mid West, can be controlled with
early fall application of the
herbicides AAtrex or Outfox,
says Nathan L. Hartwig, weed
scientist at The Pennsylvania
State University.
The weed needs to be controlled
in croplands, he affirms, since a
heavy infestation of quackgrass
can reduce yields of almost any
crop by 50 percent or more.
AAtrex and Outfox require at
least 6 to 8 weeks to be absorbed
into quackgrass roots and foliage
prior to a hard frost, Dr. Hartwig
explains. Quackgrass foliage will
become yellow and remain
yellow as long as the herbicide is
working, he says.
Avoid using more than the
recommended application, he
points out, since a heavy ap
plication will kill the foliage but
not the plant AAtrex and Outfox
Help Us
Serve You
If your organization didn’t
make our farm calendar this
week, it’s not because we
don’t like you or your or
ganization.
We may have missed it in
the rush. Or maybe you for
got to tell us.
Either way, we’d like to
extend our farm community
service to you.
To get on the Farm Calen
dar, remind us by calling
394-3047 or 626-2191 or by
writing to Lancaster Farm
ing, 22 E. Main St., Lititz,
Pa. 17543. And help us serve
you better.
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keep quackgrass from making
use of sunlight to produce energy,
a process known as photosyn
thesis. By obstructing
photosynthesis during the fall,
quackgrass will live on its stored
energy and go into the winter in a
weakened condition.
“If we have a long tall or if for
some reason the quackgrass
should turn green again before a
killing frost comes, plow down
the quackgrass before it has a
chance to replace its energy
reserves,” Dr. Hartwig advises.
Fall applied AAtrex or Outfox
is practical only on sod or where
silage corn will be removed
before the end of September, he
claims. Farmers who can’t get
into a field 6 to 8 weeks prior to
time of the usual killing frost can
apply a first treatment of Outfox
or AAtrex in the spring.
Normally, fall-treated fields to
be planted to corn can be plowed
in the spring with no loss of
quackgrass control. Dr. Hartwig
says that 95 per cent of the in
crease in quackgrass infestation
comes from growth of un
derground stems or rhizomes. If
allowed to grow unchecked,
quackgrass can spread as much
as 6 feet in every direction under
ideal conditions in one growing
season.
Some underground stems or
rhizomes will survive by the
spring following fall treatment.
The initial 6 to 8 inches of
regrowth by these large rhizomes
will reduce their energy reser
ves. Early spring application of
nitrogen will also stimulate
regrowth of the quackgrass and
further reduce energy reserves.
A second spring herbicide
treatment is recommended at
corn planting time or soon
thereafter to finish off the
quackgrass. This second treat-
Quackgrass
ment will also control most an
nual weeds. In using herbicides,
read the label carefully and
follow safety precautions and
recommendations.
Where fields are level, there is
nothing wrong with applying
these herbicides to frozen soil or
even on top of snow—provided
melting snow won’t carry the
chemicals off the field. Such
treatment will allow the her
bicide to leach into the root zone
before the quackgrass starts to
grow, immediately stopping
production of energy from
sunlight in the spring.
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Rheems.Pa. QuarryviUe, Pa.
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There is little chance of her
bicide injury to small grain or
legume seeding made in the
spring a year after using dalapon
followed by AAtrex or Outfox at
corn planting time. While not as
effective as Outfox or AAtrex,
dalapon works best when applied
to actively growing quackgrass
in the fall or spring.
A corn crop itself also helps to
control quackgrass, Dr. Hartwig
observes. Competition from a
good stand of corn can finish off
the last 20 to 25 percent of the
quackgrass.
ALLIS-CHALMERS
I. H. Brubaker
Lancaster, Pa.
JOHN Z. MARTIN
New Holland RDI
Phone 717-354-5848
ROHRER’S MILL
R. D. 1, Ronks
JE'MAR FARM
SUPPLYING.
Lawn—Ph: 964-3444
H. JACOB HOOBER
Intercourse, Pa.
HAROLD H. GOOD
Terre Hill
GRUBB SUPPLY CO.
Elizabethtown
E. SAUDER & SONS
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Stevens, Pa
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R. D. 2, Peach Bottom
H. M. STAUFFER
& SONS, INC.
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