rate limitation and efficacy trials for low-volume … ncwss...low volume basal bark herbicide...
TRANSCRIPT
![Page 1: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/1.jpg)
Rate limitation and efficacy trials for low-volume basal bark treatments
of C. orbiculatus and L. maackii with aminopyralid and triclopyr
Karla Gage, Southern Illinois University Carbondale/River to River Cooperative Weed Management Area
Scott Flynn, Dow AgroSciencesChris Evans, University of Illinois Extension/Illinois Department of Natural
Resources – Illinois Wildlife Action PlanDavid Gibson, Southern Illinois University Carbondale
![Page 2: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/2.jpg)
Amur honeysuckleLonicera maackii
![Page 3: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/3.jpg)
Amur honeysuckleLonicera maackii
![Page 4: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/4.jpg)
Southern Illinois University, Database of Exotic Plant Species
Observations of Amur honeysuckle
Decade
70's 80's 90's 00's
Num
ber
of
ob
serv
atio
ns
0
10
20
30
40
![Page 5: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/5.jpg)
Amur honeysuckleLonicera maackii EDDMapS. 2015.
![Page 6: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/6.jpg)
Celastrus orbiculatusOriental bittersweet
![Page 7: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/7.jpg)
Celastrus orbiculatusOriental bittersweet EDDMapS. 2015.
![Page 8: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/8.jpg)
![Page 9: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/9.jpg)
![Page 10: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/10.jpg)
Low Volume Basal Bark Applications
![Page 11: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/11.jpg)
Low Volume Basal Bark Applications
Triclopyr + aminopyralid
![Page 12: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/12.jpg)
Low Volume Basal Bark Herbicide Applications
• In dense stands of invasive species, land managers may exceed labeled rate, but this has not been quantified.
• This knowledge will help ensure the safe use of herbicide and the protection of the ecological resources which land managers seek to conserve through the treatment of invasive woody plants.
![Page 13: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/13.jpg)
Low Volume Basal Bark Herbicide Applications
• Test the efficacy of control of five rate combinations of triclopyr and aminopyralid for each woody species.
• The addition of a small percentage of aminopyralid (1 – 2%) and a reduction of the rate of triclopyr ester may increase control efficacy.
![Page 14: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/14.jpg)
Questions:
At what stem densities are land managers at risk of exceeding labeled rate in low volume basal bark applications of triclopyr?
Does the addition of aminopyralid to triclopyrester increase control efficacy?
![Page 15: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/15.jpg)
Experiment 1:
Objective: Establish the mathematical relationship between stem density and volume of solution applied.
![Page 16: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/16.jpg)
Experiment 1: Methods• Establish circular plots – 5 m radius (0.02 acre)• Treat each plot (covering the stem from ground level up to
15”) using water. Repeat applications 3 times (3 different applicators)
• Measure volume of water in sprayer before and after each application
• Count stem density per plot, measure stem diameter• Calculate stand basal area for Amur honeysuckle and
Oriental bittersweet• Establish relationship between stem density, basal area and
spray volume per plot
![Page 17: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/17.jpg)
![Page 18: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/18.jpg)
Stem Count
0 20 40 60 80 100
Sp
ray V
olu
me
(m
l)
0
100
200
300
400
500
f(x) = 34.691 + (3.567 * x)
R2 = 0.81, p = 0.009
Relationship: spray volume & stem count
Amur honeysuckleLonicera maackii
![Page 19: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/19.jpg)
Stem Count
0 10 20 30 40 50 60
Sp
ray V
olu
me
(m
l)
0
50
100
150
200
250
300
350
400
f(x) = 11.434 + (5.200 * x)
R2 = 0.81, p<0.001
Celastrus orbiculatusOriental bittersweet
![Page 20: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/20.jpg)
Conversion Factor
Conversion factor = 1.33 for water BOBPSI
ml/
min
ute
![Page 21: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/21.jpg)
Stem Density Estimate per 0.4 ha (1 acre)
0 1000 2000 3000 4000
He
rbic
ide
Vo
lum
e in
Oil
Ca
rrie
r (m
l)
0
2000
4000
6000
8000
20% Triclopyr
15% Triclopyr
10% Triclopyr
2% Aminopyralid
1% Aminopyralid
Triclopyr rate limit
Aminopyralid spot spray rate limit
Aminopyralid rate limit
Stem Density Estimate per 0.4 ha (1 acre)
0 1000 2000 3000 4000
He
rbic
ide
Vo
lum
e in
Oil C
arr
ier
(ml)
0
2000
4000
6000
8000
20% Triclopyr
15% Triclopyr
10% Triclopyr
2% Aminopyralid
1% Aminopyralid
Triclopyr rate limit
Aminopyralid spot spray rate limit
Aminopyralid rate limit
Spray plot stem densities and spray volumes are scaled-up to 1 acre to estimate risk of exceeding labeled use rate.
Amur honeysuckleLonicera maackii
![Page 22: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/22.jpg)
Application limits –estimated # stems/ac
Rate (v/v)
Limit/ac Limit/ac Est. stems/ac
Est. stems/1m radius
Equation for stem density to herbicide volume
1% 7 fl. oz 217 ml 4077 16 y = 23.773 + 0.047x
2% 7 fl. oz 217 ml 1786 7 y = 47.547 + 0.095x
1% 14 fl. oz 414 ml 8232 33 y = 23.773 + 0.047x
2% 14 fl. oz 414 ml 3862 15 y = 47.547 + 0.095x
Amur honeysuckleLonicera maackii
![Page 23: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/23.jpg)
Stem Density Estimate per 0.4 ha (1 acre)
0 500 1000 1500 2000 2500 3000
Herb
icid
e V
olu
me in O
il C
arr
ier
(ml)
0
2000
4000
6000
Fewer stems, less risk…
Celastrus orbiculatusOriental bittersweet
![Page 24: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/24.jpg)
Application limits –estimated # stems/ac
Rate (v/v)
Limit/ac Limit/ac Est. stems/ac Est. stems/1m radius
Equation for stem density to herbicide volume
1% 7 fl. oz 217 ml 3023 12 y = 7.836 + 0.069x
2% 7 fl. oz 217 ml 1459 6 y = 15.671 + 0.138x
1% 14 fl. oz 414 ml 5869 23 y = 7.836 + 0.069x
2% 14 fl. oz 414 ml 2886 12 y = 15.671 + 0.138x
Celastrus orbiculatusOriental bittersweet
![Page 25: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/25.jpg)
Rate Limits
• Applications of triclopyr do not approach rate limit of 7571 ml per 0.4 ha (8 quarts per 1 acre)
• Partial acreage application of 1 or 2 % aminopyralid may be necessary
![Page 26: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/26.jpg)
Experiment 2:
Objective: To test control efficacy of varying rate combinations of aminopyralid and triclopyrester on Amur honeysuckle and Oriental bittersweet.
![Page 27: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/27.jpg)
5 rate combinations: • 20% triclopyr
• 15% triclopyr + 1% aminopyralid
• 15% triclopyr + 2% aminopyralid
• 10% triclopyr + 1% aminopyralid
• 10% triclopyr + 2% aminopyralid
• Tag and treat 21 plants with each rate class. Follow mortality through time. Determine efficacy.
![Page 28: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/28.jpg)
Celastrus orbiculatusOriental bittersweet
![Page 29: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/29.jpg)
1 year AT
• Amur honeysuckle
– Treatment difference: χ2=11.29, p=0.05
• Oriental bittersweet
– No difference between treatments
![Page 30: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/30.jpg)
Amur honeysuckle
Herbicide treatments
T20 T15/A1 T15/A2 T10/A1 T10/A2
Perc
enta
ge o
f surv
ivors
0
2
4
6
8
10
Amur honeysuckleLonicera maackii
Nu
mb
er
of
surv
ivo
rs
# survivors out of 21 plants in each treatment
A A A
A
B
7 7 7
8
1
![Page 31: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/31.jpg)
• Amur honeysuckle control was best with 15% triclopyr + 2% aminopyralid
– If treating area with > 1700 stems per acre, spot treating/treating half the acre is necessary to stay within the labeled use rate
– Applying no more than 5.5 gallons of spray solution to 50% of an acre
![Page 32: Rate limitation and efficacy trials for low-volume … ncwss...Low Volume Basal Bark Herbicide Applications •Test the efficacy of control of five rate combinations of triclopyr and](https://reader030.vdocuments.mx/reader030/viewer/2022040222/5e3f7641cbef672b28661406/html5/thumbnails/32.jpg)
AcknowledgmentsSIUC Center for Ecology & IDNR summer interns:Erick Baumberger & Adam Jackson