(Continued from Page 18)
large percentage of your acre
age to a given hybrid.
• All the Bt com hybrids pro
vide excellent first generation
protection, but some only pro
vide partial protection from
second generation infestations
(See Table 1).
• The percentage of fields
with high levels of first genera
tion infestation are low com
pared to the number with signi
ficant second generation infes
tations.
• Make sure the Bt hybrid
you select has other agronomic
characteristics that are import
ant on your farm (disease resis
tance, yield potential).
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• All fields with a Bt com
hybrid will look better than
those without it when ECB lar
vae are present, but this doesn’t
always translate into increased
yield.
•When the grain or silage in
the field will be fed to live
stock, Bt com will decrease the
incidence of ear mold.
The Bt com technology is a
good one to help protect com
yield from the pest. Because it
is an excellent tool to manage
the pest, there is a risk that
usage levels will be high. If this
occurs, then the likelihood of
ECB becoming resistant to the
Bt toxin will increase. For this
reason, the US EPA is requir
GREG ROTH
Penn State Agronomy
Associate Professor
Another application of
biodegradable corn-based
plastics is on the market in
the turf industry.
Turf Tacs are biodegrad-
ing that a resistance manage
ment plan be provided along
with a company’s application
for registration and that farm
ers implemment the plan. The
main component of a resis
tance management plan is that
farmers leave some areas in a
field or in a nearby field plant
ed to non-Bt com hybrids
where susceptible genetic
types of the ECB can survive to
mate with resistant individuals
that do survive on Bt com.
How this plan will be tactically
implemented is still being de
bated and research is under
way to help define the design
of a resistance management ap
proach in Pennsylvania.
Corn Talk, Lancaster Farming, Saturday, January 30, 1999—Page 21
Corn-Based Product
Kee
New “Turf Tacs” anchor turf and mulches. They are
made from biodegradable, corn-based plastics.
able plastic staples for
anchoring turfgrass, erosion
control netting, and grass
and flower mats. These sta
ples are available in either U
shaped or L-shaped forms.
Advantages of the corn
based biodegradable plastics
are that they help to prevent
damage to mowing equip
ment and degrade in three to
eight weeks. The staples are
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2.25 inches long, 1.0 inches
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The Turf Tacs are “stapled”
into the turf with a hand held
unit called a Turf Tacker that
allows you to drive the sta
ples from an upright position.
The Turf Tacs and the Turf
Tacker were developed by
Eco Turf, Inc., Chicago, 111.
and are marketed locally by
Seedway.
the
and
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