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.
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.
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. 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. 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. 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. 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
17. Common Dandelion
Generally easy to control
– Rarely requires repeat applications
– Fall applications are highly effective
• Products:
– Mixtures, 2,4-D, (Drive is weak)
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.
21. Broadleaf Plantain
Generally easy to control
– May require repeat applications
– Fall applications are highly effective
• Products:
– Mixtures, 2,4-D, Drive
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
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
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. 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
48. Black Medic
Not difficult to kill
- Treat in spring
- Treat before or at early flower
• Products:
– Mixtures with Triclopyr, Drive
Clopyralid, or Fluroxypyr.
50. Lawn Violets
• Generally difficult to control
– Requires repeat applications
– Fall applications are more effective
• Products:
– Mixtures with Triclopyr are most effective
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. 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. 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. General control guidelines
7. Seasonal timing
Fall is best
Spring is okay
Summer is worst
8. Rates
Follow label instructions
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. 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. 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. Scenario #1 – Unirrigated site loaded with
False Dandelion
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. Scenario #2 – Neglected lawn that is irrigated.
Weeds: clover, common dandelion, plantain.
Low N fertility favors clover
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.
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. 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).
Notas do Editor
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.