ScriptThis slideset is to help farmers be able to identifyand effectively control Palmer pigweed. It isresistant to glypho...
Palmer PigweedAmaranthus palmeri
History of Palmer Amaranth• Found in Lauderdale County, TN in 2006• Across West TN in 2008• Couldn’t kill certain Pigweeds...
Enter question text...Can You Identify These Pigweeds?        1      2                         31.   Photo 12.   Photo 33....
Smooth                Palmer          WaterhempPigweed               Amaranth
Palmer Amaranth                  Bradley Missouri
Waterhemp Short Flowering   Palmer Long        Branches             Flowering                              Branches
Lauderdale County 2008152 oz/A Roundup PowerMax                     Steckel 2008
22 fb 22 ozs/A Roundup PM on 1-3” then 6-8” Palmer                                       Steckel 2009
2 WAA of 40 oz/a of Gly 4
Just Gave Up!                Steckel 2009
Taproot of             A. PalmeriAllen 2009
Waterhemp & Palmer Amaranth Distribution in KY                           (Co. Agent Survey 2010)      Waterhemp           ...
Waterhemp & Palmer Amaranth Distribution in KY                           (Co. Agent Survey 2011)      Waterhemp           ...
Soil-Residual Herbicides For Palmer AmaranthSoil Residual Herbicide Site of Activity             P.AmaranthAuthority Assis...
Postemergence Soybean Herbicides for            Waterhemp & Palmer AmaranthPost           Site of Activity     P. Amaranth...
KIH 485 (pyroxasulfone) Initial Discovery &     MARKETING IN US    Development              (2012 ?)                      ...
PYROXASULFONE HERBICIDESHERBICIDE                 ACTIVE INGREDIENTSPRODUCT                 PyroxasulfoneZIDUA            ...
EVALUATION OF PREEMERGENCE HERBICIDES FORPALMER AMARANTH CONTROL (Major’s farm) – 2011)
ANTHEM 8 oz/A          Photo 10-04-11 (Approx 10 WAT)
Fierce 3.75 oz/A                   Photo 10-04-11 (Approx 10 WAT)
Zidua 2.5 oz/A                 Photo 10-04-11 (Approx 10 WAT)
Preemergence Control of Palmer Amaranth                            (Fulton Co 2011)HERBICIDE               RATE           ...
Preemergence Control of Palmer Amaranth                            (Fulton Co 2011)HERBICIDE                    RATE      ...
Preemergence Control of Palmer Amaranth                            (Fulton Co 2011)HERBICIDE              RATE            ...
Preemergence Control of Palmer Amaranth                            (Fulton Co 2011)HERBICIDE              RATE            ...
GR Pigweed Summary• Pre Emergence Options  •   Boundary (1.5 pts)  •   Envive (2.5 ozs)  •   Prefix (1 qts)  •   Valor (3 ...
GR Pigweed Summary• Post Options:  • 1 to 3” Palmer amaranth  • Flexstar (1.5 pts)  • Cobra (12 ozs)  • Blazer (1.5 pts)
Pre Partially Activated and Post a Few Days Late                                       Steckel 2010
Pre Washed Away and Post a Few Days Late                                  Steckel 2010
The Difference of 2 Days!Flexstar on 6” Palmer   Flexstar on 3” Palmer                                     Steckel 2010
What about Ignite?•   Ignite (glufosinate) is a viable alternative•   Needs to be applied during middle of the day•   Use ...
29oz Ignite @ 10gal
Same Weed – 3 WAA
Timing isCRITICAL!!!
PPO’s                      Ignite• 1-3 tall Palmer           • 1-6 tall Palmer• Multiple applications     • MUST USE 15gal...
Glyphosate-Resistant Weeds            Southern United StatesConyza canadensis (marestail)Amaranthus palmeri (Palmer amar...
Questions?        Cam Kenimer        Fulton County Extension Service        2114 South 7th        Hickman, KY 42050       ...
Palmer Pigweed 2012
Palmer Pigweed 2012
Palmer Pigweed 2012
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Palmer Pigweed 2012

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  • Photo from Fulton County, KY 2011
  • Photo from Fulton County, KY 2011
  • Fulton County, KY 2011. Notice how the weed is been chopped (layed over) and sprayed (no leaves) and is still growing. Photo from next to farmer’s grain facility
  • Fayette County outlier = Came in switchgrass seed.
  • Fulton County, KY 2011
  • Not high enough rate of water.Fulton County, KY 2011
  • Flexstar is the one that provided the best control of the PPO’s in our plots and Ignite did very well, as well.
  • Palmer Pigweed 2012

    1. 1. ScriptThis slideset is to help farmers be able to identifyand effectively control Palmer pigweed. It isresistant to glyphosate, so we are having to findalternative methods of control. The followingwill walk you through the process of Need,Identification, and Control.
    2. 2. Palmer PigweedAmaranthus palmeri
    3. 3. History of Palmer Amaranth• Found in Lauderdale County, TN in 2006• Across West TN in 2008• Couldn’t kill certain Pigweeds in Fulton County in 2008• Confirmed Resistance in 2009 in Fulton County• Outbreak in 2010• Began Intense Focus in 2011
    4. 4. Enter question text...Can You Identify These Pigweeds? 1 2 31. Photo 12. Photo 33. Photo 2 33% 33% 33% 1 3 2 o o o ot ot ot Ph Ph Ph
    5. 5. Smooth Palmer WaterhempPigweed Amaranth
    6. 6. Palmer Amaranth Bradley Missouri
    7. 7. Waterhemp Short Flowering Palmer Long Branches Flowering Branches
    8. 8. Lauderdale County 2008152 oz/A Roundup PowerMax Steckel 2008
    9. 9. 22 fb 22 ozs/A Roundup PM on 1-3” then 6-8” Palmer Steckel 2009
    10. 10. 2 WAA of 40 oz/a of Gly 4
    11. 11. Just Gave Up! Steckel 2009
    12. 12. Taproot of A. PalmeriAllen 2009
    13. 13. Waterhemp & Palmer Amaranth Distribution in KY (Co. Agent Survey 2010) Waterhemp Palmer Amaranth Waterhemp & Palmer AmaranthLast Updated 11-23-2010
    14. 14. Waterhemp & Palmer Amaranth Distribution in KY (Co. Agent Survey 2011) Waterhemp Palmer Amaranth Waterhemp & Palmer AmaranthLast Updated 12-5-11
    15. 15. Soil-Residual Herbicides For Palmer AmaranthSoil Residual Herbicide Site of Activity P.AmaranthAuthority Assist PPO + ALS ─Authority First / Sonic PPO + ALS XAuthority MTZ PPO + PS II XBoundary PS II + Cell Div . XEnvive PPO +ALS + ALS XGangster PPO + ALS ─Prefix PPO + Cell Div. XSpartan Charge PPO + PPO ─Treflan Microtubule XValor SX PPO XValor XLT PPO & ALS X
    16. 16. Postemergence Soybean Herbicides for Waterhemp & Palmer AmaranthPost Site of Activity P. AmaranthHerbicideUltra Blazer PPO ─Cobra PPO ─Flexstar PPO XFlexstar GT PPO + EPSP X GlutamineIgnite X Synthetase
    17. 17. KIH 485 (pyroxasulfone) Initial Discovery & MARKETING IN US Development (2012 ?) • BASF (Zidua)• KUMIAI Chemical Industry Co, Ltd • FMC (Anthem)• IHARA Chemical Industry Co.,Ltd • VALENT (Fierce)
    18. 18. PYROXASULFONE HERBICIDESHERBICIDE ACTIVE INGREDIENTSPRODUCT PyroxasulfoneZIDUA Pyroxasulfone +ANTHEM Fluthiacet (Cadet) Pyroxasulfone +FIERCE Flumioxazin (Valor) (For Corn & Soybean 2012?)
    19. 19. EVALUATION OF PREEMERGENCE HERBICIDES FORPALMER AMARANTH CONTROL (Major’s farm) – 2011)
    20. 20. ANTHEM 8 oz/A Photo 10-04-11 (Approx 10 WAT)
    21. 21. Fierce 3.75 oz/A Photo 10-04-11 (Approx 10 WAT)
    22. 22. Zidua 2.5 oz/A Photo 10-04-11 (Approx 10 WAT)
    23. 23. Preemergence Control of Palmer Amaranth (Fulton Co 2011)HERBICIDE RATE % ControlAnthem 8 oz/A 100Fierce 3.75 oz/A 100Zidua 2.5 oz/A 98Applied: 7-27-2011 Rated: 10-04-2011
    24. 24. Preemergence Control of Palmer Amaranth (Fulton Co 2011)HERBICIDE RATE % ControlAnthem 8 oz/A 100Fierce 3.75 oz/A 100Zidua 2.5 oz/A 98Dual II Magnum 1.67 pt/A 70Warrant 1.7 pt/A 60Boundary 3 pt/A 100Applied: 7-27-2011 Rated: 10-04-2011
    25. 25. Preemergence Control of Palmer Amaranth (Fulton Co 2011)HERBICIDE RATE % ControlAnthem 8 oz/A 100Fierce 3.75 oz/A 100Zidua 2.5 oz/A 98Authority First 6.45 oz/A 100Authority MTZ 18 oz/A 98Authority XL 7.5 oz/A 98Applied: 7-27-2011 Rated: 10-04-2011
    26. 26. Preemergence Control of Palmer Amaranth (Fulton Co 2011)HERBICIDE RATE % ControlAnthem 8 oz/A 100Fierce 3.75 oz/A 100Zidua 2.5 oz/A 98Prefix 2.75 pt/A 100Spartan 8 OZ/A 100Valor 2.5 oz/A 100Applied: 7-27-2011 Rated: 10-04-2011
    27. 27. GR Pigweed Summary• Pre Emergence Options • Boundary (1.5 pts) • Envive (2.5 ozs) • Prefix (1 qts) • Valor (3 ozs) • Authority MTZ (18 ozs) • Valor XLT ( 3 ozs)
    28. 28. GR Pigweed Summary• Post Options: • 1 to 3” Palmer amaranth • Flexstar (1.5 pts) • Cobra (12 ozs) • Blazer (1.5 pts)
    29. 29. Pre Partially Activated and Post a Few Days Late Steckel 2010
    30. 30. Pre Washed Away and Post a Few Days Late Steckel 2010
    31. 31. The Difference of 2 Days!Flexstar on 6” Palmer Flexstar on 3” Palmer Steckel 2010
    32. 32. What about Ignite?• Ignite (glufosinate) is a viable alternative• Needs to be applied during middle of the day• Use minimum of 15 gallons of water• New for this year – – Sequential Application – 22-36 oz fb 22-29 oz
    33. 33. 29oz Ignite @ 10gal
    34. 34. Same Weed – 3 WAA
    35. 35. Timing isCRITICAL!!!
    36. 36. PPO’s Ignite• 1-3 tall Palmer • 1-6 tall Palmer• Multiple applications • MUST USE 15gal/Ac! may be necessary • Try to apply in the• Sequential applications middle of the day prohibited • Can use sequential application
    37. 37. Glyphosate-Resistant Weeds Southern United StatesConyza canadensis (marestail)Amaranthus palmeri (Palmer amaranth)Ambrosia trifida (giant ragweed)Ambrosia artemisiifolia (common ragweed)Amaranthus tuberculatus (common waterhemp)Lolium multiflorum (Italian ryegrass)Sorghum halepense (Johnsongrass)Eleusine indica (Goosegrass)Poa annua (annual bluegrass)
    38. 38. Questions? Cam Kenimer Fulton County Extension Service 2114 South 7th Hickman, KY 42050 270-236-2351 www.ca.uky.edu/fulton

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