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2004 Weed Control Update (Peanut, Field Corn, Sunflowers). Dr. Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia. December 2003. Topic for Discussion. Peanuts Field Corn Sunflowers? Problems questions. Peanuts. Valor Formulations Arrow - PowerPoint PPT Presentation
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Dr. Eric P. Prostko
Extension Weed Specialist
Dept. Crop & Soil Sciences
University of Georgia December 2003
2004 Weed Control Update(Peanut, Field Corn, Sunflowers)
Topic for DiscussionTopic for Discussion
Peanuts Field Corn Sunflowers? Problems questions
PeanutsPeanuts
Valor FormulationsArrowProwl H20newer metolachlor formulations
PeanutsPeanutsValor FormulationsValor Formulations
2001: 51 WDG 2002-03: 51 WP 2004: Valor SX
51WDG
* smaller particles
* dispersing agents
* easier to get into suspension
Peanut yield response to Valor (3 Peanut yield response to Valor (3 ozs/A) formulation and timing.ozs/A) formulation and timing.
4892 4920 4896 49344548 4534 4653
0
1000
2000
3000
4000
5000
6000
2001 2002-03 2004 Untreated
Formulation
Yiel
d (l
bs/A
)1 DAP 4 DAP
PE-02-03Attapulgus
P = 0.80CV = 12
PeanutsPeanutsArrow 2ECArrow 2EC
clethodim POST grass control in broadleaf crops generic Select Makhteshim-Agan 6 -16 ozs/A price/service
Texas Panicum Control with POST Grass Texas Panicum Control with POST Grass Herbicides (44 DAT)Herbicides (44 DAT)
98 98 98
0
25
50
75
100
Arrow (6 ozs/) Select (6 ozs/A) Poast (16 ozs/)
PE-19-03Ponder Farm
Applied to 2-4” tall grass
PeanutsPeanutsProwl HProwl H2200
2004 3.8 lbs/gal 2.0 pts/A water-based micro-encapsulated less staining better for strip-
tillage? increased price
Peanut Yield Response to PREPeanut Yield Response to PREApplications of DNA HerbicidesApplications of DNA Herbicides
6000 6000 5955 5884 5922 6058 6039
0
1000
2000
3000
4000
5000
6000
7000
Untreated Sonalan Sonalan Prowl EC Prowl EC Prowl H20 Prowl H2O
PE-11-03Ponder Farm P = 0.346
2 pts/A 3 pts/A 1.8 pts/A 2.4 pts/A 1.6 pts/A 2.1 pts/A
PeanutsPeanutsNew Metolachlor FormulationsNew Metolachlor Formulations
Cinch Dupontsame as Dual II Magnum
Stalwart C Sipcam Agro USA Inc. “old” Dual EC formulation (7.8 lbs/gal) not labeled for peanut
Me-Too-LachlorDrexel“old Dual EC formulation (8 lbs/gal) rates are too low
Field CornField Corn
Option vs. Accent Aim (harvest-aid) Basis Gold vs.
Steadfast ATZ RR corn issues
Pioneer RR corn hybrids
glyphosate timings
Field CornField CornOption vs. AccentOption vs. Accent
POST grass control except crabgrass OP/SU interaction roughly same cost/A similar weed control
and yields in UGA tests
Texas Panicum Control in Field Corn- I Texas Panicum Control in Field Corn- I Accent and OptionAccent and Option
8595 95 95
8494 94 94
0
20
40
60
80
100
11 DAT 23 DAT 36 DAT 83 DAT
Rating Date
Cont
rol -
%Accent Option
CN-03-03Ponder Farm
Applied 24 DAPPANTE = 1”; 2-3LF
Texas Panicum Control in Field Corn- IITexas Panicum Control in Field Corn- IIAccent and OptionAccent and Option
66 70
85
6570 7080
68
0
20
40
60
80
100
12 DAT 19 DAT 29 DAT 96 DAT
Rating Date
Cont
rol -
%Accent Option
CN-04-03Attapulgus
Applied 24 DAPPANTE = 2”; 2-5 LF
Corn Yields with Accent and OptionCorn Yields with Accent and Option
209175
212181
166
95
0
50
100
150
200
250
Ponder Attapulgus
Location
Bu/A
Accent Option Untreated
a a
CN-03-03CN-04-03
b ab a
c
Accent vs. OptionAccent vs. OptionAttapulgus - 2003 (19 DAT)Attapulgus - 2003 (19 DAT)
Untreated Accent @ 0.67 ozs/AAgrioil @ 1% v/v
Option @ 1.5 ozs/AMSO @ 1.25% v/v
AMS @ 3 lbs/AApplied 24 DAP/0.25-2” tall PANTE
Field CornField CornAim (Harvest-Aid)Aim (Harvest-Aid)
24C label in GA, MS, LA, NC
up to 1.9 ozs/A COC @ 1% v/v 3 day PHI morningglories pigweeds weak on sicklepod
Field CornField CornBasis Gold vs. Steadfast ATZBasis Gold vs. Steadfast ATZ
3 way mixes of atrazine/Accent/Matrix
Steadfast has more Accent
Both have greater potential to cause crop injury
confirm hybrid tolerance
Corn Hybrid Herbicide Susceptibility ChartsCorn Hybrid Herbicide Susceptibility Charts
Field CornField CornRR Corn IssuesRR Corn Issues RR Corn 2 (NK 603 event)
Up to 30” tall (over-the-top)
30-48” tall (drop nozzles) higher in-crop use rates/A
(64 ozs vs 44 ozs RUWM) Pioneer will have several
varieties Will this change the
game?
U.S. Corn Acres Planted to HerbicideU.S. Corn Acres Planted to HerbicideResistant VarietiesResistant Varieties
78
11
15
0
2
4
6
8
10
12
14
16
2000 2001 2002 2003
Year
% o
f Acr
es
Source: NASS
SunflowersSunflowers
Dual Magnum label IMI-Tolerant
sunflowers (Clearfield)
SunflowersSunflowersDual MagnumDual Magnum
PPI or PRE1-1.33 pts/Acoarse soils with
3% or less OM
SunflowersSunflowersIMI-Tolerant (Clearfield)IMI-Tolerant (Clearfield)
Mycogen seed8N429CL
non-GMO Beyond 1AS imazamox 4 ozs/A 2-8 leaf stage less rotation
restrictions than other imi’s
cotton = 9 months
Weed Control in IMI (Clearfield) SunflowersWeed Control in IMI (Clearfield) SunflowersAttapulgus, GA 2003 (60 DAT)Attapulgus, GA 2003 (60 DAT)
Untreated Beyond 1AS @ 4 ozs/AAMS @ 3 lbs/A
80/20 @ 0.25% v/vProwl 3.3EC @ 2.4 pts/A over entire test.
Problems Worthy of Note in 2003Problems Worthy of Note in 2003
misapplications of glyphosate
rain-free periods FL pusley unusually unusual
weed problems groundcherry eclipta copperleaf
Glyphosate Mishaps in Peanut!Glyphosate Mishaps in Peanut!
Roundup WeatherMax vs. Crop OilRoundup WeatherMax vs. Crop Oil
Groundcherry spp.Groundcherry spp.
SWSS SWSS
EcliptaEclipta
Hophornbeam CopperleafHophornbeam Copperleaf
Does this field have a weed problem?Does this field have a weed problem?
A closer look?A closer look?
University ofGeorgia
Extension Weed Science
(gaweed.com)