Japanese Knotweed Suppression Results over the last 3 years · Herbicide Broadcast Rate applied...
Transcript of Japanese Knotweed Suppression Results over the last 3 years · Herbicide Broadcast Rate applied...
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Knotweed SuppressionResults over the last 3 years
Mark Renz ([email protected])
http://fyi.uwex.edu/weedsci/
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Knotweed can invade a wide range of habitats
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Before you select a management method determine the following:
1. What products are labeled for use at this location?– Homeowner (urban), Roadside (noncrop),
Streambank(aquatic)
2. What desirable plants are present or will be seeded?– Herbicide selectivity/residual activity
3. What is the size of the infestation?– Individual plant treatment vs largescale
4. How accessible is the infestation?
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How we evaluate herbicide effectiveness
1. Dense population of target weed species
2. Replicated trial
– Evaluate treatments/timings
3. Broadcast treatments
– 10 x 25 ft per plot
– 20 GPA
– Uniform coverage/distribution
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Methods evaluated:
• 2012:– Herbicides applied in summer after mowing
– Herbicides applied in fall after mowing 2x
• 2013:– Herbicides applied in fall after mowing 1x
• 2014: (no info in this presentation!)– Milestone applied in fall after
• Not mowing (60, 80 100 GPA)
• Mow 1x (July)
• Mow 2x (July + August)
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Why have we been mowing plots before treating?
• Allows for more accurate application
– Less off target injury, less herbicide used
• More herbicide applied closer to root
– Better translocation
• Easier to apply
– Not walking through a jungle
• Mowing promotes grass
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2012 Site and Methods
• RCB with 3 reps at McFarland Wisconsin– Working with Dane County Parks– Plots 20 ft long by 10 ft wide
• Mowing– Entire area plot on May 28 (plants 3 ft tall)– Mowed fall treated plots again June 25 (plants 3 ft
tall)
• Herbicide applications– Applied July 13 (summer) or September 12 (Fall)– 20 gallons per acre– Plants 1.5-2.0 ft tall
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2012 Herbicides Evaluated
Herbicide Broadcast Rate
Active ingredient
Selectivity
Arsenal(Habitat)
5.25 pt/A(3%)
Imazapyr Not selective(residual)
Capstone 1.3 gal/A (6.5%)
Triclopyr + aminopyralid
Safe to established grasses (residual)
Perspective 6 oz/A Aminocyclopyrachlor+ chlorsulfuron
Safe to established grasses (residual)
Milestone 9 & 13
10 or 14 floz/A (spot)(0.4 or 0.5%)
Aminopyralid Safe to established grasses (residual)
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0102030405060708090
100
Pe
rce
nt
Co
ver
(%)
12 MAT
letters indicate difference at P<0.05
Untreated
Japanese Knotweed cover Sprayed in JulyMcFarland, WI 12MAT
d
ab
a
cbc
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0102030405060708090
100
Pe
rce
nt
Co
ver
(%)
12 MAT
18 MAT
letters indicate difference at P<0.05
Untreated
Japanese Knotweed cover Sprayed in JulyMcFarland, WI 12-18 MAT
d
ab
a
cbc
B
A
A
A
A
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0102030405060708090
100
Pe
rce
nt
Co
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(%)
12 MAT
* Indicates significantly different than UTC at P<0.05
Untreated
Japanese Knotweed cover Sprayed in SeptMcFarland, WI 12-18 MAT
* * * * *
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0102030405060708090
100
Pe
rce
nt
Co
ver
(%)
12 MAT
18 MAT
* Indicates significantly different than UTC at P<0.05
Untreated
Japanese Knotweed cover Sprayed in SeptMcFarland, WI 12-18 MAT
* * * * *
C
BC
B
A
A
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Milestone fall Arsenal
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Should I spray JK summer or fall?McFarland WI 1 YAT
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5
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25
30
Pe
rce
nt
Co
ver
(%)
July 12 MAT
Sept 12 MAT
Jul *
Sept *
Sept *
No Difference
* Indicates significantly different at P<0.05
Untreated cover =>95%
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Summary from 2012 experiments
• What we learned:– Milestone and Arsenal (Habitat) most effective
herbicides.– Response to timing was herbicide specific
• Arsenal: July best• Milestone: September best• Perspective: no difference
• Questions left to answer:– Can we mow 1x and treat in fall?– What about glyphosate (homeowner situations)?
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2013 Site and Methods
• RCB with 4 reps in Sheboygan Wisconsin– Working with SEWISC
• Cody and Steve Klock
– Plots 20 ft long by 10 ft wide
• Mowed entire area July 23rd
• Applied to resprouts September 15th
– 20 gallons per acre
– Plants 2-3 ft tall
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Mowing 1x per year isn’t easy!
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Herbicides EvaluatedHerbicide Broadcast Rate applied Active
ingredient(s)Selectivity
Arsenal(Habitat)
4 pints/A Imazapyr Not selective(extended residual activity)
Capstone 1 gallon/A Triclopyr + aminopyralid
Safe to established grasses (extended residual activity)
Crossbow 1 gallon/A 2,4-D + triclopyr Safe to established grasses ( limited residual activity)
Rodeo*** 8 lbs ae/A (9% solution)
Glyphosate Not selective (no residual activity)
Milestone 7
7 fl oz/A (broadcast)
Aminopyralid Safe to established grasses (extended residual activity)
Milestone 10 & 14
10 & 14 fl oz/A (spot only)
Aminopyralid Safe to established grasses (extended residual activity)
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J. Knotweed Cover spray Sept.Sheboygan, WI 9 MAT
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40
60
80
100
Pe
rce
nt
Co
ver
(%)
*
*
** * *
*
June UTC
* Indicates significantly different from UTC at P<0.05
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Milestone 10 fl oz/A
Milestone 10 fl oz/A
Crossbow UTC
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• Arsenal 64 fl oz/A
Capstone Arsenal
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J. Knotweed Cover spray Sept.Sheboygan, WI 12 MAT
0
20
40
60
80
100
Pe
rce
nt
Co
ver
(%)
Sept JK Cover (12 MAT)
*
*
** * *
Sept UTC
* Indicates significantly different from UTC at P<0.05
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Treated plots again this fall!
• SEWISC mowed in July– Thanks Steve/Cody!
• Resprouted to 1-2 feet tall• Broadcasted milestone at 14 fl oz/A in
September
• Will be able to evaluate effectiveness of consecutive year treatments!– Does level of control in year 1 matter?– What is vegetation response?
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Summary from 2013 experiments
• What we learned:
– Milestone, Arsenal (Habitat), and glyphosate effective in fall.
– Mowing JK once will work with these herbicides
• Questions left to answer:
– Do we need to mow?
– Do we get better control when mowing 1x or 2x?
– Does herbicide volume alter control if we don’t mow?
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Conclusions
• Knotweed can be suppressed, but need to follow-up control after 1 yr.
– Range of herbicides that are effective
• Herbicide selection based on
– Species present
– Type of site
– Goals for location
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Thanks to the following
• Dow Agrosciences– Mary Halstvedt
– Lou Ann Brooks
• SEWISC– Cody and Steve
• Staff– Brendon Panke
– John Albright
– Tony Summers
– Students
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10
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40
50
60
cove
r (%
)June Japanese Knotweed Cover
6/27/2014 (9 MAT) A
B
C C C CCC
Letters indicate differences at P<0.05
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0
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10
15
Ste
ms
pe
r sq
uar
e m
ete
rJune J. Knotweed Stem Density
6/27/14 (9 MAT)A
B
C C C CCC
Letters indicate differences at P<0.05
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0
10
20
30
40
50
September J. Knotweed Cover 9/24/14 (12 MAT)
A
AB
C
C C C
BC
C
Letters indicate differences at P<0.05