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![Page 1: Dr. Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia December 2004 2005 Weed Control Update (Peanut, Field Corn,](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649e245503460f94b1260d/html5/thumbnails/1.jpg)
Dr. Eric P. Prostko
Extension Weed Specialist
Dept. Crop & Soil Sciences
University of Georgia December 2004
2005 Weed Control Update(Peanut, Field Corn, Soybeans, Sunflowers)
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PeanutsPeanuts
Spartan Cobra newer metolachlor formulations Valor Issues others issues
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Spartan in PeanutSpartan in Peanut
Labeled in 2004 not in FL
4F formulation 4.8 to 8.0 ozs/A soil-applied broadleaf weed control nutsedge cotton rotation concerns crop injury on lighter
soils PPO inhibitor
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Spartan Rotation RestrictionsSpartan Rotation Restrictions
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Spartan InjurySpartan Injury
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Cobra in PeanutCobra in Peanut
Labeled in Fall 2004 postemergence
6 leaf peanut90 day PHI
12.5 ozs/A broadleaf weed control a hotter Blazer tank-mixes with Basagran,
Cadre, Pursuit, Select, 2,4-DB PPO inhibitor
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Metolachlor Mysteries?Metolachlor Mysteries?
9 formulations in marketplace
new metolachlors (88% s + 12% r)Dual Magnum, Dual II Magnum (Syngenta)Cinch (DuPont)
old metolachlors (50% s + 50% r)Stalwart, Stalwart C (Sipcam)Me-Too-Lachlor, Me-Too-Lachlor II (Drexel) Parallel PCS, Parallel (Makhteshim-Agan)
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Metolachlor PricesMetolachlor Prices
Dual Magnum $95/gal $11.88/pt($8.16/11 ozs)
Stalwart C* $65/gal $8.13/pt
Me-Too-Lachlor $61/gal $7.63/pt
*only labeled for use in field corn and popcorn
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Tropical SpiderwortTropical Spiderwort
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Tropical Spiderwort Response to Dual Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - IMagnum and Stalwart, Grady Co., 2004 - I
89 89
74
8682
61
0
20
40
60
80
100
9 DAT 29 DAT 43 DAT
Time
Co
ntr
ol
- %
Dual MagnumStalwart
Applied PRE at 1 pt/A.
*
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Tropical Spiderwort Response to Dual Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - IIMagnum and Stalwart, Grady Co., 2004 - II
89 88 89
78
64
87 89 86
72
51
0
20
40
60
80
100
9 DAT 21 DAT 29 DAT 41 DAT 92 DAT
Time
Co
ntr
ol
- %
Dual MagnumStalwart
Applied POST at 1 pt/A with glyphosate to 3” tall COMBE.
*
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Valor Issues: Is that hose clean?Valor Issues: Is that hose clean?
Tank/Line RinsateLine in Glyphosate
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Valor and Sprayer CleanupValor and Sprayer Cleanup
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Which plot had AMS?Which plot had AMS?(Both had Cadre at 1.44 ozs/A + Agrioil @ 1% v/v applied 24 DAP)
PE-08-04July 1 ,200428 DAT
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Which plot had AMS?Which plot had AMS?
PE-08-04August 3, 200454 DAT
403 404
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Field CornField Corn
Option vs. Accent RR corn issues
glyphosate timings
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Field CornField CornOption vs. AccentOption vs. Accent
POST grass control except crabgrass OP/SU interaction roughly same cost/A 2004 Option was less
effective than Accent
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Texas Panicum Control - ITexas Panicum Control - IAccent vs Option - 2004Accent vs Option - 2004
70
90
71
48
70
84
49
30
0
20
40
60
80
100
9 DAT 28 DAT 54 DAT 104 DAT
Time
Con
trol
- %
Accent Option
CN-03-04 (Ponder Farm)Applied 22 DAPPANTE = 1”, 3-4 leaf
a a
abcbcd
b
c c
d
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Texas Panicum Control - IITexas Panicum Control - IIAccent vs Option - 2004Accent vs Option - 2004
79
94 90 90
7566
6055
0
20
40
60
80
100
14 DAT 35 DAT 55 DAT 104 DAT
Time
Con
trol
- %
Accent Option
CN-04-04 (Attapulgus)Applied 21 DAPPANTE = 1-2”, 2-4 leaf
ab b
a
b
a
b
a
b
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Texas Panicum Control - IIITexas Panicum Control - IIIAccent vs Option - 2004Accent vs Option - 2004
73 71 687676
6156 55
0
20
40
60
80
100
13 DAT 35 DAT 55 DAT 104 DAT
Time
Con
trol
- %
Accent Option
CN-06-04 (Attapulgus)Applied 21 DAPPANTE = 1-2”, 3-4 leaf
ab ab ababc
a
ab
a
bcd
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Texas Panicum Control (104 DAT) - IITexas Panicum Control (104 DAT) - IIAccent vs Option - 2004Accent vs Option - 2004
CN-04-04 (Attapulgus)Applied 21 DAPPANTE = 1-2”, 2-4 leaf
Untreated Accent @ 0.67 ozs/AAgrioil @ 1% v/v
Option @ 1.5 ozs/AMSO @ 1.25% v/v
AMS @ 3 lbs/A
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Conventional or RR Systems?Conventional or RR Systems?
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Are the RR hybrids any good?Are the RR hybrids any good?
79
245226
76
234 239 237
0
50
100
150
200
250
300
Untreated Accent +Atrazine
Dual fb Accent Roundup WM(split 22 ozs/A)
Weed Management System
Bu/
A
Pioneer 31G98 DK 67-60RR
CN-07-04
b b
a a a a a
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Use Rates for Glyphosate in RR CornUse Rates for Glyphosate in RR Corn
RR-Corn RR-Corn 2
Normal Rate/A 0.75 ae 0.75 ae
Maximum Rate/A 0.75 ae 1.12 ae
Maximum TotalIn-Crop
1.50 ae 2.25 ae
Timing Up to V8 or 30” Up to V8 or 30”30-48” (drops)
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SoybeansSoybeans
Nutsedge control in RR beans
RR cotton in RR soybeans
Mn tank-mixes Sequence tropical spiderwort glyphosate timings
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Nutsedge Management in RR SoybeansNutsedge Management in RR Soybeans split applications of
glyphosatebetter on purple than yellow
tank-mix with Classic controls yellow suppresses
purple
tank-mix with Pursuitbetter on purple than yellow rotations/cost
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Controlling RR Cotton in RR SoybeansControlling RR Cotton in RR Soybeans
Canopy - PREmetribuzin + chlorimuron8 ozs/A
POST glyphosate tank-mixesResource (4 ozs/A)Reflex (12 ozs/A)Classic (0.33 ozs/A)
need PRE fb POST to be most effective
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Glyphosate/Manganese Tank-MixesGlyphosate/Manganese Tank-Mixes
research from VA has shown that Mn will reduce weed control when tank-mixed with glyphosate 9 to 38% reductions
depending upon species Mn not a problem with
Blazer, Classic, Pursuit, or Basagran.
Sources: Bailey et al., 2002 (Weed Technology 16:792-799) and Heckman et al., 1999 (Journal of Production Agriculture 12:445-448)
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Sequence for Weed Control in RR Sequence for Weed Control in RR SoybeansSoybeans
label in October 2004 mixture of glyphosate -K
+ Dual Magnum 2.5 -3.0 pts/A
$/15-18/A0.70 ae + 0.94 ai (2.5 pts)0.84 ae + 1.13 ai (3.0 pts)
prior to 3rd trifoliate tropical spiderwort?
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Tropical Spiderwort Management in RR Tropical Spiderwort Management in RR SoybeansSoybeans
Use Dual Magnum or generic PRE in known fields
tank-mix Pursuit or Classic with glyphosate
Extreme 2.17SC @ 3 pts/A = glyphosate (0.75 lb ai/A) + Pursuit (0.063 lb ai/A)
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To Prevent Yield Loss in RR SoybeansTo Prevent Yield Loss in RR Soybeans
control weeds by 4-5 weeks after planting
or control weeds before
they reach 6-9” in height
or control weeds before
the V3 stage
Source: Purdue University Extension Weed Science Group, 2004(4.7 million acres of RR soybeans planted)
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SunflowersSunflowers
Spartan PPI or PRE 4F @ 3-3.75 ozs/A only soil applied
broadleaf herbicide registered
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University ofGeorgia
Extension Weed Science
(gaweed.com)