tropical spiderwort management in peanut, corn, and soybean
DESCRIPTION
Tropical Spiderwort Management in Peanut, Corn, and Soybean. Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia Tifton. Control Strategies in Peanut. row spacing * twins vs. singles residuals * Dual Magnum * Strongarm POST’s * Gramoxone Max - PowerPoint PPT PresentationTRANSCRIPT
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Tropical Spiderwort Management in
Peanut, Corn, and Soybean
Eric P. Prostko
Extension Weed Specialist
Dept. Crop & Soil Sciences
University of Georgia
Tifton
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Control Strategies in Peanut• row spacing
* twins vs. singles• residuals
* Dual Magnum
* Strongarm• POST’s
* Gramoxone Max
* Cadre
* Basagran
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Tropical spiderwort control in peanut as influenced by row spacing
8274
0
20
40
60
80
100
Twin Single
Row Spacing
Con
trol
- %
Source: Yoder et al. 2003 (FL)
a b
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Tropical spiderwort control in peanuts with Dual Magnum applied preemergence, Grady Co., 2003.
94 9486 88
96
0
20
40
60
80
100
12 DAT 26 DAT 41 DAT 64 DAT 109 DAT
Rating Date
Contr
ol -
%
Dual Magnum 7.64EC @ 1.33 pts/A
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Tropical spiderwort control with Gramoxone Max + Dual Magnum Tank-Mixes
0
20
40
60
80
100
14 29-32 52-62 96-98
Time (DAT)
Con
trol
- %
2002 2003
Gramoxone Max @ 5.5 ozs/A +Dual Magnum @ 1.33 pts/A Grady County
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A B
Tropical spiderwort control in peanuts. A = untreated; B= Gramoxone Max + Dual Magnum applied 17 DAP. Photos taken 49 DAP.
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How much Dual Magnum can we use?
• 1-1.33 pt/A
• 2.8 pts/year
• 90 day PHI
• cost/A
– $90/gal
– $31.50/2.8 pts
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Other Metolachlor Formulations• Cinch
– Dupont
– same as Dual II Magnum– cannot use POST
• Stalwart C
– Sipcam Agro USA Inc.
– “old” Dual EC formulation (7.8 lbs/gal)– not labeled for peanut
• Me-Too-Lachlor– Drexel– “old Dual EC formulation (8 lbs/gal)– rates are too low
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Strongarm in Peanut
• PPI or PRE
• thru cracking*
• not labeled for POST use at this time but working on this issue
* cracking = soil displaced by germinating seedlings just prior to emergence
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Tropical spiderwort control in peanuts with Strongarm @ 0.45 ozs/A, Grady Co., 2003.
7568
11
9790
7588
78
60
0
20
40
60
80
100
46 DAP 69 DAP 114 DAP
Rating Date
Contr
ol -
%
PRE EPOST LPOST
PRE = 5 DAPEPOST = 17 DAP (2”, 3 leaf)LPOST = 31 DAP (up to 6”)
aab a
abcd
b abcc
e
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Untreated Strongarm applied17 DAP
Strongarm applied31 DAP
PE-24-0346 DAP
Tropical spiderwort control withPOST applied Strongarm, 2003
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Gramoxone Max and CadreTank-Mixed or Split Applications?
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Tropical spiderwort control withGramoxone Max and Cadre
8476
36
9287
61
0
20
40
60
80
100
46 DAP 69 DAP 114 DAP
tank-mixsplit
Tank-mix applied 17 DAP/Split applied 17 and 31 DAP
(LSD 0.05 = 11) (LSD 0.05 = 15) (LSD 0.05 = 22)
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Tropical spiderwort control in peanuts. A = untreated; B= Cadre applied 7 DAP. Photos taken 49 DAP.
A B
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What About Cadre + Dual Combos?
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Tropical Spiderwort Control with Cadre + Dual Magnum
61
85
0102030405060708090
GM fb Cadre GM fb Cadre + Dual Magnum
Treatment
Con
trol
- %
114 DAP LSD 0.05 = 22
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Tropical spiderwort control in peanuts with Valor applied preemergence, Grady Co., 2003.
95
6863
40
00
20
40
60
80
100
12 DAT 26 DAT 41 DAT 64 DAT 109 DAT
Rating Date
Contr
ol -
%
Valor 51 WP @ 3 ozs/A
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Tropical Spiderwort in Field Corn
* preemergenceDual II MagnumAtrazine (?)
* postemergence2,4-DBasagran
* post-directedGramoxone MaxAimEvik
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Tropical Spiderwort in Soybeans
* narrow rows* preemergence
SencorDual MagnumBoundaryCanopy SPCanopy XL
* postemergenceBasagran
* post-directedGramoxone Max
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Post-Harvest Control Strategies
• prevent seed production
• re-growth after harvest
• time before first frost
• Gramoxone Max
• 2,4-D
• tillage
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Tropical spiderwort control with various herbicides - 14 DAT
28 2629
58
21
63
48 51
75
60
01020304050607080
Applied October 31, 20036” tall spiderwort LSD 0.05 = 13
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Tropical Spiderwort in AustraliaTropical Spiderwort in Australia • Weed problem for
20-30 years• control in other
crops important• corn
– 2,4-D
– Dual
• peanut– Pursuit
– Dual
– 2,4-D
E.P. with Australian peanut farmer, Wayne Learmonte