Making Sense of All the Post Emergent Herbicide Options in Turf

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A presentation by Brian MacDonald
- Making sense of all the Choices
-- Review the “standard” 3 – way mixes
-- Look at “new kids” on the block
-- Review “alternative” herbicide mixes
- Review the common weeds and match the herbicides to the weeds.
- Maximizing weed kill – other factors.
- Go through a few scenarios.

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  • The first 7 are basically identical except for Trimec 1000 (Signal Word) and Mec Amine-D with a immaterial difference in 2,4-D rate (.02 hundreds of a pound/acre).The last one has quite a bit less 2,4-D, which probably makes it cheaper. Note: Mec Amine-D says ‘causes irreversible eye damage, whereas, Trimec 1000 says “causes substantial, but temporary eye damage”. The Banvel label (Dicamba only) says the high rate is 1.0 lbs/acre, but the added rate to Are these all amine formulations?
  • LAF = Landscapers application formula – lower rate of Dicamba to minimize risk on trees.
  • Triamine has no dicamba to protect against possible tree root damage.Super Trimec is an ester formulation. Without MCPP
  • Suprisingly Confront did not do well.
  • Summer annual
  • To get good clover control, you need to add something like Turflon Ester (Triclopyr), Drive (Quinclorac), or QuickSilver (Carfentrazone) to a 3 – way mix. Spotlight (fluroxypyr by itself) is no longer being sold by Dow, so you would need to apply a premixed product such as Escalade 2.
  • Make sure herbicide won’t
  • Making Sense of All the Post Emergent Herbicide Options in Turf

    1. 1. Making Sense of All the Post Emergent Herbicide Options in Turf Brian McDonald OSU Horticulture Dec 17, 2013
    2. 2. Turf Herbicides are Like Cereals – more choices than you need.
    3. 3. PBI Gordon Has 8 “Trimec’s”! 1. Super Trimec 2. Trimec 1000 3. Trimec 992 4. Trimec – Bentgrass Formula 5. Trimec Classic 6. Trimec LAF – 637 7. Trimec Plus 8. Trimec Southern
    4. 4. NuFarm Has Even More Choices! 1. 4-Speed (Pyraflufen + 2,4-D, MCPP, Dicamba) 2. 4-Speed XT (Pyraflufen + 2,4-D, Triclopyr, Dicamba) 3. Cool Power (Ester Triclopyr, MCPA, Dicamba) 4. Escalade 2 (2,4-D, Fluroxypyr, & Dicamba) 5. Horsepower (MCPA, Triclopyr, and Dicamba) 6. Quincept (2,4-D, Drive, & Dicamba) 7. (3) different “Triplet”s (Low odor, Sensitive & SF) 8. Change Up (MCPA, fluroxypyr, dicamba) 9. Elliptical (2,4-D, Fluroxypyr, & Dicamba) 10. Millennium Ultra 2 (2,4-D, Clopyralid, & Dicamba)
    5. 5. How do we make sense out of all of these?
    6. 6. Overview 1. Making sense of all the Choices a. b. c. Review the “standard” 3 – way mixes Look at “newer kids” on the block Review “alternative” herbicide mixes 2. Review the common weeds and match the herbicides to the weeds. 3. Maximizing weed kill – other factors. 4. Go through a few scenarios.
    7. 7. Common Broadleaf Chemicals Chemical 2,4-D 2,4-DP MCPA MCPP Dicamba Triclopyr Clopyralid Quinclorac Common formulations Amine salt Ester Amine salt Ester Amine salt Ester Amine salt Amine salt Amine salt Ester Amine salt Amine salt
    8. 8. “New Kids on the Block” Chemical Common formulations Fluroxypyr (Spotlight/Escalade 2) Ester Carfentrazone (Quicksilver/SpeedZone/ PowerZone) Sulfentrazone (in Q4) Pyraflufen (in 4-Speed + 2,4-D, MCPP, Dicamba) Pyraflufen (in 4-Speed XT + 2,4-D, Triclopyr, Dicamba) Penoxulam (Sapphire) Florasulam (Defendor) Tenacity (Mesotrione) – Post/Pre emergent
    9. 9. My Classifications 1.“Standard” 3-way Mixes 2.Non 2,4-D 3-way Mixes 3.Safety 3–Way Mixes 4.Specialty 3-Way Mixes
    10. 10. “Standard” Mixtures 2,4-D + MCPP + Dicamba Amine formulations: Trimec Classic Mec Amine-D Triplet Low Odor
    11. 11. Standard 3-Way Mixes They are all the same thing! lbs of ae per acre at 4 pts/Acre Herbicide Mec Amine-D Signal Word Danger 2,4-D 1.22 MCPP 0.33 Dicamba 0.11 Trimec 1000 Warning 1.19 0.33 0.11 Trimec 992 Danger 1.19 0.32 0.11 Triplet - Low Odor Danger 1.19 0.32 0.11 Triplet - Selective Danger 1.19 0.32 0.11 Triplet SF Danger 1.19 0.32 0.11 Lesco Three-Way Danger 1.19 0.32 0.11 Trimec Classic Danger 0.99 0.27 0.11
    12. 12. Standard 3-Way Mixes “Non 2,4-D Mixes” lbs of ae per acre at 4 pts/Acre High Rate Signal Word Form. Pts./Acre gal/acre MCPA MCPP Dicamba Trimec Encore Danger DMA Salt 4.00 0.50 1.49 0.32 0.15 Tri-Power Danger DMA Salt 4.10 0.51 1.59 0.31 0.15 If you are banned from using 2,4-D, substitute MCPA. Your weed control will be the same.
    13. 13. Standard 3-Way Mixes “Safety Mixes” Low rate of dicamba for tree safety Signal Herbicide Trimec LAF 637 Rate lbs of ae per acre at 4 pts/Acre Word Pints/Acre 2,4-D MCPP Dicamba Danger 3.7 1.52 0.25 0.06 Low rate of 2,4-D for sensitive grass safety (e.g. bentgrass) Trimec - Bentgrass Warning 6 0.53 0.33 0.14 Triplet - Sensitive Danger 4 0.41 0.72 0.18
    14. 14. Standard 3-Way Mixes “Specialty Mix” These both add 2,4-DP, a sister compound of 2,4-D which has no effect on weed control. Doubles the rate of dicamba for vs. standard 3 – way mix, butacreMCPP. lbs of ae per no High Rate * Ester Signal Word Pts./Acre gal/acre Super Trimec* Warning 3.0 0.4 2,4-D 2,4-DP MCPP Dicamba 0.7* 0.4* 0.0 0.2 0.3 0.0 Getting rid of the MCPP and using an ester formulation lowers the signal word because esters don’t cause irreversible eye damage Triamine Danger 4.0 0.5 0.6 0.3
    15. 15. 2,4-D (or 2,4-DP) + MCPP + Dicamba MCPA + MCPP + Dicamba Amine formulations Good Control: Common Dandelion, False Dandelion, Mousear Chickweed Plantain, Fair Control: Black Medic & Clover Poor Control: Oxalis, English Daisy, Yarrow, Veronica
    16. 16. Common Dandelion Good Control with standard 3-Way mixes
    17. 17. Common Dandelion Generally easy to control – Rarely requires repeat applications – Fall applications are highly effective • Products: – Mixtures, 2,4-D, (Drive is weak)
    18. 18. False Dandelion Good Control with standard 3-Way mixes
    19. 19. False Dandelion Surprisingly hard to control – Fall applications are more effective – Repeat treatments necessary – Spring treated weeds tend to recover • Products: – Mixtures with 2,4-D, 2,4-D + Drive.
    20. 20. Broadleaf Plantain Good Control with standard 3-Way mixes
    21. 21. Broadleaf Plantain Generally easy to control – May require repeat applications – Fall applications are highly effective • Products: – Mixtures, 2,4-D, Drive
    22. 22. Mousear Chickweed Good Control with standard 3-Way mixes
    23. 23. Mousear Chickweed • Fairly easy to control – May need repeat applications – Timing is flexible • Products: – Most mixtures, MCPP, Dicamba
    24. 24. Spotted Spurge Summer annual: Germinates @ 50 ° F Grows thru summer and seeds Dies from frost in fall Good Control with standard 3-Way mixes
    25. 25. Spotted Spurge • Post emergence: – All mixtures – Early in season is best – May require repeat applications
    26. 26. What about? • • • • • • Clovers English Daisy Veronica Oxalis (Woodsorrel) Common Yarrow And others……
    27. 27. Strategies for improving mixture performance 1.Change components 2.Add components 3.Change formulations
    28. 28. Modified 3-way Mixtures Escalade 2 Super Trimec 2,4-D* Fluroxypyr** Dicamba 2,4-D** Dichlorprop** Dicamba Chaser Ultra 2 Cool Power MCPA** Fluroxypyr** Dichlorprop* MCPA** Triclopyr** Dicamba * Amines ** Esters
    29. 29. Add/Change Components Speedzone Powerzone 2,4-D** MCPP*** Dicamba*** Carfentrazone MCPA** MCPP*** Dicamba*** Carfentrazone Q 4 Plus 2,4-D* Quinclorac Dicamba* Sulfentrazone Surge 2,4-D* MCPP* Dicamba* Sulfentrazone * Amine ** Ester *** Acid
    30. 30. New Components Carfentrazone & Sulfentrazone: Family: aryl triazolinone Impact: Faster weed response in cool weather Increased spectrum of weed control Pyraflufen is also in this class
    31. 31. White Clover Fair Control – repeat applications needed
    32. 32. Clovers Easy to injure, hard to kill – Fall applications are more effective – Repeat treatments necessary – Spring treated weeds tend to recover • Products: – Mixtures with Drive, Triclopyr, Clopyralid, or Fluroxypyr
    33. 33. English Daisy Poor Control
    34. 34. English Daisy Hard to kill – Fall applications are more effective – Repeat treatments improve kill – Spring treatments tend to recover • Products: – Mixtures with Drive, and SpeedZone + Drive + Dicamba, Penoxulam.
    35. 35. OSU 2004 English Daisy Control Trial* Rate Treatments Speedzone + Drive + Dicamba Drive 75 DF + MSO Mec amine D Surge Speedzone Untreated Control pts/acre Apps. 5 10 wks. 2 100 0.7 1 lb/acre 4 2 2 99.9 99.3 4 4 0 1 1 0 85 78.5 0 1 lb/acre *Trial conducted by Brian McDonald
    36. 36. Untreated Drive Speedzone Mecamine D 4 weeks after trt.
    37. 37. Speedzone + Drive + Dicamba: 4 wks
    38. 38. New Herbicides Fluroxypyr • Alone: No longer available. • Mixtures: Escalade 2 Chaser 2 ultra
    39. 39. OSU 2005 Broadleaf Weed Control Trial* Single spray weed control at 4 weeks after treatment Treatment False D. Com D. W Clover Healall Spotlight 67.3 77.8 100 56.4 92 96.3 12.9 13.2 Spotlight + 2,4-D am. 98.1 96.8 81.1 84 Spotlight + Triplet 99.8 99.1 89.2 88.7 Escalade Low Odor 95.7 96.3 33.3 46.2 0 0 0 0 2,4-D amine. Untreated *Conducted by Brian McDonald
    40. 40. OSU 2005 Broadleaf Weed Control Trial* Single spray weed control at 12 weeks after treatment False D. Com D. W Clover Healall 94 65.2 100 75.7 2,4-D amine 94.8 94.4 94.1 31.6 Spotlight + 2,4-D am. 98.6 97.9 100 96 Spotlight + Triplet 99.8 96.3 100 100 Escalade Low Odor 99.6 92.3 100 99.8 0 0 0 0 Treatment Spotlight Untreated *Conducted by Brian McDonald
    41. 41. New Herbicides Fluroxypyr • Alone: No longer available. • Mixtures: Escalade 2 Chaser 2 ultra
    42. 42. Veronica filiformis
    43. 43. OSU 2006 Veronica filiformis trial* 9 weeks after treatment Treatment pts/acre Apps Spotlight + 2,4-D 2+1 Spotlight 2.5 Drive 75 DF + MSO 1 lb/acre Spotlight + 2,4-D 1+2 Escalade 2 3 Confront 2 Untreated na 2 2 2 2 2 2 0 % Control 99.4 98.9 98.8 97.9 94.9 56.7 32.4 * Conducted by Brian McDonald
    44. 44. Wood Sorrel Poor Control with 3-Way Mix – need Triclopyr
    45. 45. Woodsorrel, Oxalis corniculata
    46. 46. Common yarrow Poor Control with 3-Way Mix – need Triclopyr
    47. 47. Black Medic, Medicago Lupulina
    48. 48. Black Medic Not difficult to kill - Treat in spring - Treat before or at early flower • Products: – Mixtures with Triclopyr, Drive Clopyralid, or Fluroxypyr.
    49. 49. Lawn violets, Viola sp.
    50. 50. Lawn Violets • Generally difficult to control – Requires repeat applications – Fall applications are more effective • Products: – Mixtures with Triclopyr are most effective
    51. 51. Ground Ivy, Glechoma hederacea
    52. 52. Ground Ivy • Timing: – Fall ( Oct 1- Nov 1) • Chemicals: – Strong Triclopyr, 2,4-D, Fluroxypyr, Mixtures – Weak Dicamba, Clopyralid, Quinclorac
    53. 53. Quiz Chemicals that do a good job controlling: Clover and Black medic
    54. 54. Answer Clover & Black Medic Control Carfentrazone, Drive, fluroxypyr, and clopyralid
    55. 55. Quiz Chemicals that do a good job controlling: Veronica
    56. 56. Answer Veronica Control Drive, Fluroxypyr
    57. 57. Quiz Chemicals that do a good job controlling: English Daisy
    58. 58. Answer: English Daisy Drive, Q4 Plus, Speedzone + Drive + Dicamba, Penoxulam. (Control may be variable based on biotype.)
    59. 59. Quiz A chemical that does a good job controlling: Oxalis,Yarrow, Lawn violets, & Ground Ivy
    60. 60. Answer: Oxalis,Yarrow, Lawn violets, & Ground Ivy Triclopyr
    61. 61. 2,4-D (or 2,4-DP) + MCPP + Dicamba MCPA + MCPP + Dicamba Amine formulations Good Control: Common Dandelion, False Dandelion, Mousear Chickweed Plantain, Fair Control: Black Medic & Clover, Poor Control: Oxalis, English Daisy, Yarrow, Veronica
    62. 62. Overview 1. Making sense of all the Choices a. b. c. 2. Review the “standard” 3 – way mixes Look at “new kids” on the block Review “alternative” herbicide mixes Review the common weeds and match the herbicides to the weeds. 3. Maximizing weed kill – other factors. 4. Go through a few scenarios.
    63. 63. General control guidelines 1. Treat healthy weeds 2. Increase turf vigor 3. Do irrigate before treating 4. Don’t irrigate after 5. Don’t mow before 6. Repeat treatments 2-4 weeks typical
    64. 64. General control guidelines 7. Seasonal timing Fall is best Spring is okay Summer is worst 8. Rates Follow label instructions
    65. 65. General control guidelines 9. Avoid injury to sensitive grasses Use lower rates Use safer products Sensitive grasses: Bentgrass Poa trivialis Young fine fescue
    66. 66. General control guidelines 10. Amine vs. Ester? Amines are better in warmer weather. Esters are better in cooler weather. Esters are “safer” to humans.
    67. 67. Amines vs. Esters – Signal Word Horsepower “Danger” Signal word Cool Power “Caution” Signal Word • Dimethyl Salt of MCPA • Iso-octyl Ester of MCPA • Trimethyl Salt of Triclopyr • Butoxy Ester of Triclopyr • Dicamba • Dicamba Causes irreversible eye damage! Causes moderate eye irritation.
    68. 68. Scenario #1 – Unirrigated site loaded with False Dandelion
    69. 69. Scenario #1 - Steps 1. Irrigate 2. Fertilize 3. Get grass and weeds healthy and growing 4. Make 2 applications of “Standard” 3-Way mix in Late Summer/Early Fall. 5. If you have resistant weeds, use a product with Drive (e.g. Q4 Plus)
    70. 70. Scenario #2 – Neglected lawn that is irrigated. Weeds: clover, common dandelion, plantain. Low N fertility favors clover
    71. 71. Scenario #2 - Steps 1. Irrigate, if needed, and fertilize. 2. Get grass and weeds healthy and growing. 3. Make 2 applications of SpeedZone, Q4 Plus, or Escalade 2. (i.e. you need to add Carfentrazone, Quinclorac, Triclopyr, or Fluroxypyr to get good clover control) 4. Apply in cool weather if you use esters.
    72. 72. Scenario #3 – Wet site with English Daisy
    73. 73. Scenario #3 - Steps 1. Wait until fall. 2. Fertilize, if necessary. 3. Make two applications in fall of: – – – – Drive + MSO (or add drive to 3 – way) Q4 Plus If problems, try Sapphire (Penoxulam) Last resort – SpeedZone (5 pts/A) + Banvel (0.66 pts/A+ Drive 75 DF(1 lb/A) Note: SpeedZone only has 0.03 oz ai/1,000 sq. ft. of dicamba and the Banvel adds 0.12 oz ai/1,000.
    74. 74. Sum Up 1. I.D. your weeds and grasses 2. Pick your herbicide and read the label. i. Amine vs. Ester? ii. Will chemicals kill weeds? iii. Are your grasses sensitive to this herbicide? 3. Get grass and weeds growing, if necessary 4. Make 2 applications at the correct time of year (e.g. watch for leaf out with esters).

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