Corn Rootworm Insecticide Trials Show Effectiveness
UNIVERSITY PARK
(Centre Co.) Entomologists
use the common “Iowa” root
rating system to determine
damage to roots.
A rating of 1 is an undam
aged root system, a rating of 6
is the most severely damaged
(all three nodes are chewed
completely back), and ratings
of 2 to 5 are intermediate.
Economic damage begins to
occur when the root rating ex
ceeds 3 to 3.5. The best treat
ments (lowest root ratings: 2.6
to 3.2) in the Rock Springs
Below arc selected com and soybean herbicides that arc relatively new or have the potential to
cause problems in rotational crops. Though the majority of these are “new” chemistry products, keep
in mind that older herbicides such as the triazines (c.g., acrazinc, Bladex, Princep, Sencor) and
chloroacctamides (c.g., Dual, Micro-Tech, Frontier, Harness, Surpass) soil have certain rotation
restrictions as well The information listed in this table is our interpretation of label statements or a
“best-guess” estimate. Consult the product labels if two or more herbicides arc applied during the
same season. Before applying any herbicide, consult the most recent label.
Relational Crops Following Com (months after application) a
Herbicide
Accent
Baas
Broadstnke
+ Dual
itmit
Scoipion m| 10. S
• AH = after harvest; NY = next year: NR = no restrictions
b Plus successful field bioassay.
1995 trials in Centre County
occurred with Counter 15G T
band. Fortress 2.5 G T-band
and in-furrow, all Force treat
ments, Furadan 4F broad
cast+cultivation, and Lorsban
15G T-band. Less effective
were the Dyfonate II T-band
and Furadan 4F broadcast
treatments (root ratings of 3.9
to 4.4).
All these treatments were
significantly better than the un
treated plots (root rating of
5.4). Because of the extreme
drought in Pennsylvania in
Herbicide Rotational Crop Restrictions
Grain
sorghum
Field
Com
Clovei
1995, yield data were not reli
able and are not reported.
There are two new root
worm insecticides registered
for the 1996 growing season;
Aztec and Fortress. Aztec is
from Bayer, and is a combina
tion of an organophosphate
(2.0% tebuprimiphos) and a
pyrethroid (0.1% cyfluthrin).
Fortress, from DuPont, is an
organophosphate (chlore
thoxyfos), and will be available
in either a 2.5 G or 5G formula
tion. Both these compounds
will be applied at much lower
Soy
beans
Spring
oats
Wmtci
Rye
Sweet
com
10 5
10 5
10.5
10.5
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Corn Talk, Uncaster Fanning, Saturday, October 12,1996—Page
(D®lM TMM MIWO
PENNSYLVANIA MASTER CORN GROWERS ASSOC., INC.
Table 1. Assessment of thirteen insecticide formulations
for rootworm control in Centre Co.. PA. during 1995.
Treatment Form- Application Root
ulation p ?tf a me thod b Rating
Fortress 2.5 G
Furadan 4F
Counter 15G
Force 3G
Force 1.5 G
Force 1.5 G
Lorsban ISG
Fortress 2.5 G
Fbrce 3G
Regent 1.5 G
Furadan 4F
Regent 1.5 G
Dyfonatell 15G
Untreated
a Rates are expressed as oz. AI/1000 ft. of row.
b T-Band and In-furrow granular applications were made
at planting (May 16).
BRD/CLT = Furadan broadcast on June 16,
followed immediately with cultivation;
BRD = broadcast with Furadan 4F only.
rates (2.5 oz. active ingredient/
acre for Aztec and 2.6 for For
tress), compared to other
granulars (typically 21 oz. ac
tive ingredient/acre).
Trials in Pennsylvania
(Table 1) indicate that these
new compounds compare fa
vorably with others presently
registered. As with other or
ganophosphates, there is con
cern with insecticide/herbicide
interaction in regards to plant
injury. Typically, the greatest
concern with inseclicide/herbi
cide interactions is with using
Counter, which has systemic
activity in the plant, and ALS
herbicides (sulfonylureas, imi
dazolinones, sulfonomid's).
Neither Aztec or Fortress are
systemic, and reports from
lowa have not found herbicide
interactions with them. None
theless, it is something to keep
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COMPLETE LINE OF TOP-QUALITY GRAIN DRYERS
URING TECHNIQUES
JU (GSX) AFFORDABLE QUALITY
in mind.
Fortress 2.SG and Aztec are
available in typical bags, and
are applied as any other granu
lar. These new granular mater
ials are labeled for field com,
popcorn, sweet com. silage
com, and seedcom, and are
also labeled for control of wire
worms, white grub, and seed
com maggot. They are also la
beled for cutworms, but this re
mains to be effectively
evaluated. Please read the label
of these products carefully, as
there are special precautions
relative to application near wa
ter, wildlife and fish. During
1996, Fortress 5G will be sold
and applied only through the
Smartbox™, a closed handling
system from DuPont that
mounts on the planter. If you
need more details, contact your
local DuPont representative.
T-Band 2.6
BRD/CLT 2.6
T-Band 2.7
In-funow 2.8
T-Band 2.8
In-funow 3.0
T-Band 3.0
In-furrow 3.1
T-Band 3.2
T-Band 3.2
BRD 3.7
In-funow 3.9
T-Band 4.4
5.4
IY-TRAINED DEALERS
ENTS
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SONES <rn>
GRAIN
SYSTEMS
Muncy, PA (gig)
717-584-2282
Fu 717-M4-8380
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