2011 Glyphosate-Resistant Palmer Amaranth Management in Cotton - - PowerPoint PPT Presentation
2011 Glyphosate-Resistant Palmer Amaranth Management in Cotton Culpepper, Steckel, York GR Pigweed in the Mid-south and Southeast Illinois Missouri N Carolina Tennessee Arkansas S Carolina Mississippi Georgia m a A l a b a
Culpepper, Steckel, York
Amaranthus rudis Amaranthus palmeri
Tennessee Missouri Illinois Mississippi Georgia S Carolina N Carolina A l a b a m a Louisiana Arkansas
Steckel 2010
Starting clean At-plant residuals Postemergence options Layby directed and hooded options
Tillage, cover crops, etc
Preplant/PRE herbicides for Palmer amaranth in Roundup Ready Cotton in SE
Preplant PRE Valor Direx
20 40 60 80 100 0 c
87 b 94 a 58 b
Roundup Firestorm 2 pt
70 b
Firestorm + 2,4-D (1.5 pt) Firestorm + Clarity (8 oz) Firestorm + Diuron (1.8 pt)
*COC included with all Firestorm treatments
Palmer control at planting, burndown applied 17 d
20 40 60 80 100
90 b
Valor preplant Direx preplant
99 a
Steckel 2010
Burndown Programs for GR Horseweed/ Palmer
Programs: Glyphosate + Clarity (1/ 2 pt)* * + residual herbicide Glyphosate + 2,4-D (2 pt)* * + residual herbicide SE residual: Direx or Valor M S residual: Valor
Preplant/PRE herbicides for Palmer amaranth in Roundup Ready Cotton in SE
Preplant PRE Valor Prowl + diuron + Staple Direx Reflex + Staple Reflex + Cotoran Reflex + diuron Reflex + Prowl Prowl + Cotoran Prowl + diuron
*Paraquat included with PRE except conventional till!
Palmer amaranth control by PRE herbicides; 40 days*
20 40 60 80 100
Cotoran Prowl Valor* * Direx Caparol Reflex
% control * Average of 5 locations; 2 in GA, 3 in NC. No other herbicides included. * * Applied same time as the PRE herbicides.
Staple (ALS susceptible)
GR Weed Management in Cotton GR Weed Management in Cotton
Cotoran/Caparol or Reflex on coarse soils
30 to 21 DBP Pre Emergence
Dicamba + glyphosate or Gramoxone Inteon +/- Valor
Near Planting
Burndown
Reflex apply 14 DBP and ½” of rain
RU + Staple (emerged pigweed) RU + Dual or Warrant POST1 1-lf cotton Diuron Suprend Layby Pro + MSMA RU + Dual or Warrant RU + Dual or Warrant Layby POST 2 5-6 lf cotton
0.2 0.4 0.6 0.8 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Time Herbicide concentration
Critical herbicide concentration
0.2 0.4 0.6 0.8 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Time Herbicide concentration
Critical herbicide concentration
0.2 0.4 0.6 0.8 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Time Herbicide concentration
Critical herbicide concentration
Prowl + Reflex PRE, Roundup + Dual Magnum POST 1, Roundup + Warrant POST 2, Direx + MSMA layby
POST 1 = 25 days after PRE POST 1 = 17 days after PRE
Diuron + MSMA + COC Suprend + MSMA + COC Layby Pro + MSMA + COC Gramoxone + diuron + COC (+ Valor) (still have to direct to row)
Monsanto’s Roundup Ready Cotton Performance Roundup Ready Flex Cotton (Up to $20) Valor 2 oz Valor 2 oz OR OR Reflex 1 pt = ($4.00) Reflex 1 pt = ($4.00) Cotoran, Cotton Pro, Caparol, diuron 2 pt = ($3.00)* Warrant 3 pt or Dual Magnum 1 pt = ($4.50 or $3.00) Gramoxone Gramoxone Inteon Inteon 2 pt = ($1.00) 2 pt = ($1.00)
*Will pay on 2 applications
Prowl + Reflex PRE Roundup + Dual POST Diuron + MSMA PD Prowl + Reflex PRE Ignite + Dual POST Diuron + MSMA PD
WATER VOLUME AND NOZZLE TYPE IS CRITICAL MUST KILL IT WITH THE FIRST APPLICATION
Palmer control.
This is not a 4-inch pigweed!
32 oz/A Gly 4 fb 29 oz/A Ignite on 12” Palmer
7 days after IGN application 20 days after IGN application
Palmer amaranth must be small (3 to 4 inches) if consistently controlled by Ignite
Whitaker
Ignite 29 oz + Dual Mag. POST1 1-lf cotton diuron + MSMA Ignite 29 oz
Layby POST 2 6-7 lf cotton PREPLANT and PRE
Yes NO! Can apply Roundup Acceptable (when follow recommendations) Excellent Tolerance to Ignite Proven Improving Agronomic performance Good with Ignite Good GR horseweed control Excellent with Ignite Excellent Morningglory control Can apply Roundup May need help Grass control
WRF LL
Pounds Lint Cotton
Culpepper, York and Steckel 2010
a a a b
Num ber of 29 oz/A Ignite Applications
1417 1444 1224 200 400 600 800 1000 1200 1400 1600
Pounds Lint Cotton a a b
No Ignite Ignite 2 lf and 7 lf Ignite 2 lf, 7 lf, bloom
Num ber of 29 oz/A Ignite Applications
1417 1444 1224 200 400 600 800 1000 1200 1400 1600
Pounds Lint Cotton a a b
No Ignite Ignite 2 lf and 7 lf Ignite 2 lf, 7 lf, bloom
2 lf Photo 5 d after 2 lf application
Photo 5 d after bloom + 2 wk application
Staple + Reflex + Direx PRE Roundup WMax + Parrlay POST Direx + MSMA Layby
York 2010
2010: GA: Herbicide input: $90 million 2010: TN: Herbicide input: $35 million
York 2010
GA: 92% of growers handweeding 53% of the 2010 crop = $16 million TN: growers handweeding 20% of crop = $3 million
TREFLAN/PROWL
PPI PRE
20 40 60 80 100
Before (2004) After (2008) 5 % acres *Average of Macon, Taylor, Sumpter, Schley, and Dooly counties
Herbicide Incorp.
J enkins, J
Decatur, Seminole, M iller, Taylor Ben Hill Effingham, Telfair, Tattnall, Dodge, Toombs, J eff Davis, Bleckly, Early, Lanier, Irwin, Lee, M acon Bullock, J efferson, Treutlen, Wheeler, Daugherty Emanual, M ontgomery, Atkins, Coffee, Lowndes, Dooly, Wilcox, Thomas, Crisp, Schley, Webster, Colquitt Worth, Pualski, Tift, Berrien, Echols, Turner, Brooks, Pierce, M arion, Grady, GA Counties %PPI tillage # 1-9 10 10-19 11 20-29 5 30-50 13 >50 12
Most Palmer amaranth emerges from top inch
No Deep Tillage Deep Turn No Herbicide Treatment
20 40 60 80 100
0 b 50 a Weeds *No herbicide
Deep inversion
%
Palmer requires a significant amount of sunlight to emerge!!
>90% control in middles
In the rye, control loss was in the strip