peanut weed control update 2004
DESCRIPTION
Peanut Weed Control Update 2004. Eric P. Prostko Extension Weed Specialist. Things to Talk About. Valor Arrow Prowl H 2 0 newer metolachlor formulations postemergence Strongarm reduced rates glyphosate problems. Peanuts Valor Formulations. 2001: 51 WDG 2002-03: 51 WP - PowerPoint PPT PresentationTRANSCRIPT
Peanut Weed Control Update2004
Eric P. Prostko
Extension Weed Specialist
Things to Talk About
• Valor • Arrow
• Prowl H20
• newer metolachlor formulations• postemergence Strongarm• reduced rates• glyphosate problems
PeanutsValor Formulations
• 2001: 51 WDG
• 2002-03: 51 WP
• 2004: Valor SX 51WDG
* smaller particles
* dispersing agents
* easier to get into suspension
* 10% price reduction in 04’
PeanutsArrow 2EC• clethodim• POST grass control in broadleaf crops• generic Select• Makhteshim-Agan• 6 -16 ozs/A• price/service
PeanutsProwl H20 3.8CS
• 2004
• 3.8 lbs/gal
• 2.0 pts/A
• water-based
• micro-encapsulated
• less staining
• better for strip-tillage?
• increased price
Prowl H20
pendimethalin EC
Prowl H2O
PeanutsNew 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
PeanutsStrongarm Postemergence
• labeled in March 2000• PPI, PRE, AC• broadleaf weeds• 0.45 ozs/A• $15-18/A• 6% of GA acres in 2001• 10 month cotton rotation
restriction• ALS inhibitor
Untreated Strongarm applied17 DAP
Strongarm applied31 DAP
PE-24-0346 DAP
Tropical spiderwort control withPOST applied Strongarm, 2003
Bristly Starbur Control with POSTApplied Strongarm, 2003
PE-27-03 32 DAT
Untreated Strongarm @ 0.45 ozs/A
Strongarm @ 0.113 ozs/A
Untreated Strongarm 0.45 ozs/A + 80/20 @ 0.25% v/v
(Applied 5 WAP)11 WAP
Annual MG Control with POST Applied Strongarm, 2003
PE-15-0367 DAT
Wild poinsettia control with POST herbicides, 2003
Untreated Cadre @ 1.44 ozs/A
Strongarm @ 0.45 ozs/A
Wild Radish Control with POST Applied Strongarm (1”, 3-4 leaf)
Untreated Strongarm0.45 ozs/A
Strongarm0.225 ozs/A
40 DAT
PeanutsStrongarm Postemergence Summary
• good to excellent POST control of several species
• reduced rates on sensitive species such as bristly starbur, annual morningglory, wild radish
• timing and rate are critical on some species such as beggarweed
• no POST control of sicklepod
• not labeled at this time but working on this issue
• rotation restrictions?????
Reduced Rates of Strongarm and Valor - I
PE-01A-0391 DAP
Untreated Strongarm0.45 ozs/A
Valor3 ozs/A
Strongarm0.113 ozs/A
+ Valor
0.75 ozs/A
Reduced Rates of Strongarm and Valor - II
PE-01B-0391 DAP
Untreated Strongarm0.45 ozs/A
Valor3 ozs/A
Strongarm0.113 ozs/A
+ Valor
0.75 ozs/A
Economic Returns from Reduced Rates of Strongarm (S), Valor (V), and Cadre - I
973
798865
1049995 1010
1005 1001 1032
989 984 1022
0
200
400
600
800
1000
1200
S - 0.45 ozs V - 3 ozs S - 0.113 ozs + V -0.75 ozs
$/A
0 0.72 1 1.44
PE-01A-03Tifton
Economic Returns from Reduced Rates of Strongarm (S), Valor (V), and Cadre - II
907
836
916
941
802
949
875 883908
895
837
919
700
750
800
850
900
950
1000
S - 0.45 ozs V - 3 ozs S - 0.113 ozs + V -0.75 ozs
$/A
0 0.72 1 1.44
PE-01B-03Attapulgus
SummaryReduced Rates
• less injurious than Valor at full rate • similar weed control except for tropical spiderwort
and annual mg• when used in total program (pre + post), equivalent
yields and net returns when compared to full rate programs
• same program in one field may not be the best in another field
• digging efficiency/weed seed bank concerns in field with a few escapes?
Glyphosate Mishaps in Peanut!
Roundup WeatherMax vs. Crop Oil
Yield Losses Caused By Roundup Weather Max Applied to Virginia Peanuts @ 30 DAP.
0
10
20
30
40
50
60
70
80
90
0.2 0.4 0.7 1.5 2.9 5.8 11.6 23.3
Roundup WM (ozs/A)
Yie
ld L
oss
(%
)
Source: Adapted from B. Robinson, NCSU(3 years of data)