٥ restoration of native plants through chemical control of alligatorweed at eufaula national...
TRANSCRIPT
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٥
RESTORATION OF NATIVE PLANTS THROUGH CHEMICAL RESTORATION OF NATIVE PLANTS THROUGH CHEMICAL
CONTROL OF ALLIGATORWEED CONTROL OF ALLIGATORWEED
AT EUFAULA NATIONAL WILDIFE REFUGEAT EUFAULA NATIONAL WILDIFE REFUGE
Shannon L. AllenShannon L. Allen
School of Forestry and Wildlife SciencesSchool of Forestry and Wildlife Sciences
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ALLIGATORWEEDALLIGATORWEED ( (Alternanthera philoxeroidesAlternanthera philoxeroides))
Perennial Perennial herbherb
Native to Native to South South AmericaAmerica
Vegetative Vegetative reproductionreproduction
Forms thick, Forms thick, interwoven interwoven matsmats
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ALLIGATORWEEDALLIGATORWEED
Reduces Reduces light light penetrationpenetration
Reduces gaseous Reduces gaseous exchangeexchange
DisplacesDisplaces native native plantsplants
Reduces waterway Reduces waterway drainagedrainage
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EUFAULA NATIONAL WILDLIFE REFUGEEUFAULA NATIONAL WILDLIFE REFUGE
Northern portion of Northern portion of Walter F. George Walter F. George impoundment of the impoundment of the Chattahoochee RiverChattahoochee River
2,300 hectares of 2,300 hectares of open water and open water and managed wetlandsmanaged wetlands
Primary objective includes providingPrimary objective includes providing food and food and habitat for waterfowl and other birdshabitat for waterfowl and other birds..
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MOIST-SOIL MANAGEMENTMOIST-SOIL MANAGEMENT Maintenance of Maintenance of
moist-soil conditions moist-soil conditions during growing during growing season to:season to:
Promote growthPromote growth of of desirable plant desirable plant speciesspecies
Control Control undesirable undesirable plant speciesplant species
Provide Provide food food and and habitathabitat
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NATIVE WETLAND PLANTSNATIVE WETLAND PLANTS
Sedges (Sedges (CyperusCyperus spp.) spp.)
Rushes (Rushes (RhynchosporaRhynchospora spp.)spp.)
Beggar ticks (Beggar ticks (Bidens Bidens spp.)spp.)
Smartweeds Smartweeds ((PolygonumPolygonum spp.) spp.)
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HOW DO WE CONTROL ALLIGATORWEED?HOW DO WE CONTROL ALLIGATORWEED?
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OBJECTIVESOBJECTIVES
Objective 1Objective 1 Determine the rate and timing of triclopyr Determine the rate and timing of triclopyr
and imazapyr application that most and imazapyr application that most effectively controls alligatorweed effectively controls alligatorweed
Objective 2Objective 2 Determine the rate and timing of triclopyr Determine the rate and timing of triclopyr
and imazapyr application that most and imazapyr application that most effectively restores native wetland plant effectively restores native wetland plant speciesspecies
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METHODSMETHODS
Randomized block designRandomized block design
4 blocks (15 m x 40 m)4 blocks (15 m x 40 m) Kennedy Unit (Kennedy Unit (n = n = 2)2) Bradley Unit (Bradley Unit (n n = 2)= 2)
24 plots/block24 plots/block
Experimental plots Experimental plots
(5 m x 5 m)(5 m x 5 m)
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TreatmentsTreatments 2 2 herbicidesherbicides 3 3 application ratesapplication rates
/herbicide /herbicide low, medium, highlow, medium, high
3 3 application datesapplication dates April, July, and April, July, and
September 2004September 2004
METHODSMETHODS
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HERBICIDE RATESHERBICIDE RATES
Triclopyr Triclopyr (935L(935L-ha-ha or 2.4L or 2.4L-plot -plot of water)of water) Low = 4.8LLow = 4.8L-ha -ha or 12mlor 12ml-plot-plot
Medium = 9.6LMedium = 9.6L-ha-ha or 24ml or 24ml-plot-plot
High = 14.4LHigh = 14.4L-ha-ha or 36ml or 36ml-plot-plot
Imazapyr Imazapyr (467L(467L-ha-ha or 1.2L or 1.2L-plot-plot of water) of water) Low = 1.2LLow = 1.2L-ha-ha or 3ml or 3ml-plot-plot
Medium = 2.4LMedium = 2.4L-ha-ha or 6ml or 6ml-plot-plot
High = 3.5LHigh = 3.5L-ha-ha or 9ml or 9ml-plot-plot
Rates within range recommended by Rates within range recommended by manufacturers.manufacturers.
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TREATMENT APPLICATIONTREATMENT APPLICATION
Herbicides applied Herbicides applied with a 2L, COwith a 2L, CO22 pressurized pressurized backpack backpack sprayersprayer
2.5 m wide, 2.5 m wide,
5-nozzle boom5-nozzle boom
2 swaths per plot2 swaths per plot
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PLANT SAMPLINGPLANT SAMPLING
PretreatmentPretreatment: : 1 week before 1 week before
application dateapplication date
Post treatmentPost treatment: : 1, 2, 3 weeks, and1, 2, 3 weeks, and 1, 2, 3 months1, 2, 3 months
Two subplotsTwo subplots
(0.5 m x 0.5 m) per plot(0.5 m x 0.5 m) per plot
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PLANT SAMPLINGPLANT SAMPLING
Parameters Parameters measured:measured:
percent coverpercent cover of of each plant specieseach plant species
alligatorweed alligatorweed density density (#stems/quadrat)(#stems/quadrat)
alligatorweed alligatorweed height height (cm)(cm)
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PLANT BIOMASSPLANT BIOMASS
October October 20042004 and and 20052005
AlligatorweedAlligatorweed and and nativenative
plantsplants collected collected
in subplots (in subplots (nn = 2) = 2)
(0.25 m x 0.25 m) (0.25 m x 0.25 m)
Plants sorted byPlants sorted by
species, species, dried dried to to
constant mass, constant mass,
and and weighedweighed
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STATISTICAL ANALYSISSTATISTICAL ANALYSIS
Differences in plant Differences in plant biomass between biomass between fixed variables fixed variables herbicides, rates, herbicides, rates, and application and application dates were tested dates were tested with ANOVA using with ANOVA using PROC MIXEDPROC MIXED
Pretreatment Pretreatment percent cover, stem percent cover, stem density, or height density, or height were not significant were not significant covariatescovariates
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RESULTSRESULTS
Native Plants
Alligatorweed
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ALLIGATORWEED BIOMASS - 2004ALLIGATORWEED BIOMASS - 2004
VariableVariable F ValueF Value DFDF P ValueP ValueHerbicideHerbicide 4.284.28 1,331,33 <0.05<0.05
RateRate 4.564.56 2,332,33 <0.05<0.05
Application Application DateDate
28.1128.11 1,331,33 <0.001<0.001
Herbicide x Herbicide x RateRate
0.030.03 2,332,33 N.S.N.S.
Herbicide x Herbicide x Application Application
DateDate
4.324.32 1,331,33 <0.05<0.05
Rate x Rate x Application Application
DateDate
2.522.52 2,332,33 <0.1<0.1
Herbicide x Herbicide x Rate x Rate x
Application Application DateDate
0.490.49 2,332,33 N.S.N.S.
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ALLIGATORWEED BIOMASS - 2004ALLIGATORWEED BIOMASS - 2004
Application date
Allig
ator
wee
d (g
/0.2
5m2 )
0
20
40
60
80
100
120
140LowMedHigh
a
ab
bc
c bc
c
April July
ab
a
bc
c
Application date
Alli
gato
rwee
d dr
y m
ass (
g/0.
25m
2 )
0
20
40
60
80
100
120
140
TriclopyrImazapyr
a
b
c
c
April July April July
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NATIVE PLANT BIOMASS - 2004NATIVE PLANT BIOMASS - 2004
VariableVariable F ValueF Value DFDF P ValueP ValueHerbicideHerbicide 3.483.48 1,331,33 <0.1<0.1
RateRate 1.001.00 2,332,33 N.S.N.S.
Application Application DateDate
8.888.88 1,331,33 <0.05<0.05
Herbicide x Herbicide x RateRate
0.250.25 2,332,33 N.S.N.S.
Herbicide x Herbicide x Application Application
DateDate
0.380.38 1,331,33 N.S.N.S.
Rate x Rate x Application Application
DateDate
3.203.20 2,332,33 0.050.05
Herbicide x Herbicide x Rate x Rate x
Application Application DateDate
0.180.18 2,332,33 N.S.N.S.
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NATIVE PLANT BIOMASS - 2004NATIVE PLANT BIOMASS - 2004
Herbicide
Nat
ive
plan
t dry
mas
s (g/
0.25
m2 )
0
20
40
60
80
100
120
140
a
b
Triclopyr Imazapyr
Application date
Nat
ive
plan
t dry
mas
s (g
/0.2
5m2 )
0
20
40
60
80
100
120
140
LowMedHigh
b
ab
a
ab
b
b
April July
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ALLIGATORWEED ALLIGATORWEED VSVS NATIVE PLANTS NATIVE PLANTS
Application date
Allig
ator
wee
d (g
/0.2
5m2 )
0
20
40
60
80
100
120
140LowMedHigh
a
ab
bc
c bc
c
Application date
Nat
ive
plan
t (g/
0.25
m2 )
0
20
40
60
80
100
120
140LowMedHigh
b
ab
a
ab
b
b
April July April July
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PERCENT COVER OF ALLIGATORWEED PERCENT COVER OF ALLIGATORWEED AFTER APRIL TREATMENTAFTER APRIL TREATMENT
Weeks after treatment
0 2 4 6 8 10 12
Allig
ator
weed
% c
over
0
10
20
30
40
50
60
70
80
90
100LowMediumHighControl
Triclopyr Imazapyr
Weeks after treatment
0 2 4 6 8 10 12
Allig
ator
weed
% c
over
0
10
20
30
40
50
60
70
80
90
100LowMediumHighControl
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PERCENT COVER OF ALLIGATORWEED PERCENT COVER OF ALLIGATORWEED AFTER JULY TREATMENTAFTER JULY TREATMENT
TriclopyrTriclopyr Imazapyr Imazapyr
Weeks after treatment
0 2 4 6 8 10 12
Allig
ator
weed
% c
over
0
10
20
30
40
50
60
70
80
90
100LowMediumHighControl
Weeks after treatment
0 2 4 6 8 10 12
Allig
ator
weed
% c
over
0
10
20
30
40
50
60
70
80
90
100LowMediumHighControl
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SUMMARY - 2004SUMMARY - 20041) Alligatorweed:1) Alligatorweed:
In April, imazapyr controls better than In April, imazapyr controls better than triclopyrtriclopyr
Herbicides control equally at July Herbicides control equally at July applicationapplication
July application controls better than April July application controls better than April applicationapplication
In April, high application rate more In April, high application rate more effective than medium and low rateseffective than medium and low rates
In July, no difference between ratesIn July, no difference between rates
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SUMMARY - 2004SUMMARY - 2004
2) Native plants:2) Native plants:
Triclopyr results in greater biomass than Triclopyr results in greater biomass than imazapyrimazapyr
In April, high rate results in greater In April, high rate results in greater biomass than low ratebiomass than low rate
High rate in April results in greater High rate in April results in greater biomass than high rate in Julybiomass than high rate in July
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ALLIGATORWEED BIOMASS - 2005ALLIGATORWEED BIOMASS - 2005
VariableVariable F ValueF Value DFDF P ValueP ValueHerbicideHerbicide 0.020.02 1,331,33 N.S.N.S.
RateRate 3.453.45 2,332,33 <0.05<0.05
Application Application DateDate
22.0722.07 1,331,33 <0.001<0.001
Herbicide x Herbicide x RateRate
1.181.18 2,332,33 N.S.N.S.
Herbicide x Herbicide x Application Application
DateDate
6.216.21 1,331,33 <0.05<0.05
Rate x Rate x Application Application
DateDate
0.000.00 2,332,33 N.S.N.S.
Herbicide x Herbicide x Rate x Rate x
Application Application DateDate
1.331.33 2,332,33 N.S.N.S.
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ALLIGATORWEED BIOMASS - 2005ALLIGATORWEED BIOMASS - 2005
Application Rate
All
igat
orw
eed
(g/0
.25m
2 )
0
50
100
150
200
250
a ab
b
Low Medium High
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NATIVE PLANT BIOMASS - 2005NATIVE PLANT BIOMASS - 2005
VariableVariable F ValueF Value DFDF P ValueP ValueHerbicideHerbicide 0.040.04 1,331,33 N.S.N.S.
RateRate 1.301.30 2,332,33 N.S.N.S.
Application Application DateDate
8.948.94 1,331,33 <0.01<0.01
Herbicide x Herbicide x RateRate
1.031.03 2,332,33 N.S.N.S.
Herbicide x Herbicide x Application Application
DateDate
7.197.19 1,331,33 <0.05<0.05
Rate x Rate x Application Application
DateDate
0.080.08 2,332,33 N.S.N.S.
Herbicide x Herbicide x Rate x Rate x
Application Application DateDate
0.180.18 2,332,33 N.S.N.S.
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ALLIGATORWEED ALLIGATORWEED VSVS NATIVE PLANTS NATIVE PLANTS
Application date
Allig
ator
wee
d (g
/0.2
5m2 )
0
50
100
150
200
250
Triclopyr Imazapyr
a
ab bc
c
Application date
Nat
ive
plan
t (g
/0.2
5m2 )
0
50
100
150
200
250
TriclopyrImazapyr
bc
c
abc
a
April July April July
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SUMMARY - 2005SUMMARY - 2005
1) Alligatorweed:1) Alligatorweed:
High application rate controls better than High application rate controls better than low ratelow rate
No difference between herbicides at April No difference between herbicides at April or July applicationor July application
July application of imazapyr better than July application of imazapyr better than April applicationApril application
No difference in control by triclopyr at No difference in control by triclopyr at April or July applicationApril or July application
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SUMMARY - 2005SUMMARY - 2005
2) Native plants:2) Native plants:
No difference between herbicides at No difference between herbicides at April and July applicationApril and July application
No difference between April and July No difference between April and July with triclopyr applicationwith triclopyr application
Greater native plant biomass with July Greater native plant biomass with July application of imazapyr than April application of imazapyr than April applicationapplication
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MANAGEMENT RECOMMENDATIONMANAGEMENT RECOMMENDATION
To manage for native wetland plants in To manage for native wetland plants in treatment year:treatment year: Apply high rate of triclopyr in April to control Apply high rate of triclopyr in April to control
alligatorweed and allow greatest native plant alligatorweed and allow greatest native plant biomassbiomass
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MANAGEMENT RECOMMENDATIONMANAGEMENT RECOMMENDATION To manage for native wetland plants one To manage for native wetland plants one
year after treatment:year after treatment: Apply high rate of imazapyr in July for greatest Apply high rate of imazapyr in July for greatest
control of alligatorweed and highest native control of alligatorweed and highest native plant biomass one year after treatmentplant biomass one year after treatment
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ACKNOWLEDGEMENTS:ACKNOWLEDGEMENTS: Committee membersCommittee members: Dr. Gary R. Hepp, Dr. : Dr. Gary R. Hepp, Dr. Bob S. Boyd, Dr. James H. Miller, and Dr. Ralph Bob S. Boyd, Dr. James H. Miller, and Dr. Ralph
E. MirarchiE. Mirarchi
Field TechniciansField Technicians: Erwin Chambliss, Frank Allen, : Erwin Chambliss, Frank Allen, Frank and Betty Tee SmithFrank and Betty Tee Smith
Refuge StaffRefuge Staff (Frank Dukes and especially Milton (Frank Dukes and especially Milton Hubbard)Hubbard)
FundingFunding: U.S. Fish and Wildlife Service, BASF, : U.S. Fish and Wildlife Service, BASF, and SeProand SePro