three invasive weed species: notes from alaskawilliam collins, alaska department of fish and game,...
TRANSCRIPT
![Page 1: Three Invasive Weed Species: Notes from AlaskaWilliam Collins, Alaska Department of Fish and Game, Palmer, AK Joseph Kuhl, Department of Plant, Soil, and Entomological Sciences, University](https://reader035.vdocument.in/reader035/viewer/2022070718/5ede3e48ad6a402d66698fc2/html5/thumbnails/1.jpg)
Three Invasive Weed
Species: Notes from Alaska
Steven Seefeldt
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The Weeds
– Orange hawkweed (Hieracium aurantiacum)
– White sweetclover (Melilotus alba)
– Reed canarygrass (Phalaris arundinacea)
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Orange hawkweed (Hieracium
aurantiacum) • Hieracium
– About 800 species world wide
– Hierax = hawk. It was thought that the great
vision of hawks was due to their supposed
addiction to these plants
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Orange Hawkweed
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Whitehorse
Orange Hawkweed in Alaska
• First identified in Juneau in 1961
• Starting to become more widespread
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Warnings
• From the book Wild Flowers of the Pacific
Northwest by Lewis J. Clark
– Pg 561 – “Introduce into one’s garden with
peril”
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Hawkweed reproduction
• Flowers from rosettes, typically get one
stalk
• Each stem with multiple flower heads
• Each head with multiple seeds
• Seeds dispersed by wind and easily
carried on vehicles, animals and clothes
• Many species have stolons
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Orange Hawkweed management
• Information from the south
– Mechanical methods not effective
• Mowing increases vegetative spread
• Plowing spreads
• Digging difficult
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Orange Hawkweed management
• Information from the south
– Mechanical methods not effective
• Mowing increases vegetative spread
• Plowing spreads
• Digging difficult
– No biological agents
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Orange Hawkweed management
• Information from the south
– Mechanical methods not effective
• Mowing increases vegetative spread
• Plowing spreads
• Digging difficult
– No biological agents
– Herbicides
• Must have surfactant to get past leaf hairs
• Must apply during rosette stage
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Talkeetna Weed Pull
Methods:
• 2 x 2 meter plots
• 8 treated plots, 8
control plots
• Pre-treatment % cover
estimates
• Hand pulled each
treated plot (biomass of
orange hawkweed
including roots and
stolons)
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Post-Pull (8/6/2007)
6 weeks after pull
Post-Pull (6/25/2007)
End of the day
Post-Pull (8/6/2007)
6 weeks after pull
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Field Trials
• Five sites, Talkeetna and
Homer
• Plots 6 x 30 feet
• Redeem, Transline, and
Milestone at three rates
(1, ½, and ¼ the full rate
plus a control)
• Three replications of each
of the above treatments
• Randomized complete
block
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The work in Homer, AK
Control area
Biomass harvest Milestone 1x
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Visual Injury - Redeem
0
10
20
30
40
50
60
70
80
90
Perc
en
t in
jury
0.25 0.5 1
Herbicide rate (1 = 2.3 L/ha)
A
C
B
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Visual Injury - Transline
0
10
20
30
40
50
60
70
80
Perc
en
t in
jury
0.25 0.5 1
Herbicide rate (1 = 1.1 kg/ha)
B
AB
A
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Visual Injury - Milestone
0
10
20
30
40
50
60
70
80
90
Perc
en
t in
jury
0.125 0.25 0.5 1
Herbicide rate (1 = 0.12 kg/ha)
C
A A
B
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Conclusion
• Three herbicides are promising for use on
orange hawkweed and one (Milestone) is
effective at reduced rates based on
greenhouse and field research
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Conclusion
• Three herbicides are promising for use on
orange hawkweed and one (Milestone) is
effective at reduced rates based on
greenhouse and field research
• Grasses increased as orange hawkweed
decreased
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Acknowledgements
• ARS – Jeff Conn, Joseph Kuhl, Dan Hall, Erin
Carr, Nan Werdin-Pfisterer, Trista Saunders,
Jennifer Kapla, Steve Lillard, Zachary Behr,
Katie Mohrmann, and Katie DiCristina
• AK - Caleb Slemmons, Gino Graziano, Steve
Hicks, Jen Vaughan, and Emily Perchuzel
• Weed pullers of the Youth Conservation Corps
and Talkeeta citizens
• Four land owners
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White sweet clover
(Melilotus alba)
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Where is WSC found?
• Road sides
• Braided glacial streams
• Disturbed areas
• How it got there and adapted
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What is WSC doing?
• Establishing in and adapting to the
ecosystem
• Altering ecosystem processes
– Fixing nitrogen
– Crowding out natives
• Expanding when opportunity arises
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White sweet clover
(Melilotus alba)
The Dalton Highway example
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Northern Alaska
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Study Site
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Typical patch
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Planting white sweet clover
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Moving seed around
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Preparing the seed bed
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Control options
• Mechanical
– Cultivating, hand weeding, mowing, mulching,
burning, flooding, etc
• Cultural
– Crop selection and planting technique
• Biological
– Insects, pathogens, and herbivores
• Chemical
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The easiest control option
• Prevention
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Mechanical control
• Cultivating
– Do before seed set
– Enhances seed germination of existing seed
bank
– Can be used with cover crop
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Chemical option - broadcast • Boom-buster from the Salcha Delta Soil and
Water Conservation District
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Chemical option - selective
• Wet blade mower
• USDA/ARS/SARU
Initial experimentation
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Which herbicides to use?
• Field studies
g/ha
– Chlorsulfuron Telar 17.6, 8.8, 4.4
– Triclopyr Garlon 1,200, 630, 320
– Clopyralid Transline 210, 105, 53
– 2,4-D 2,4-D 1,600, 800, 400
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Field Study Results
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Acknowledgements
• ARS – Joseph Kuhl, Dan Hall, Kate Beatie,
Elizabeth Andringa, Erin Carr, Nan Werdin-
Pfisterer, Trista Saunders, Steve Lillard, Katie
DiCristina, Zach Behr, Katie Mohrmann
• AK - Caleb Slemmons, and Gino Graziano
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Moose as a vector for non-
indigenous plant species in
Alaska
Steven Seefeldt, Subarctic Agricultural Research Unit, Fairbanks, AK
William Collins, Alaska Department of Fish and Game, Palmer, AK
Joseph Kuhl, Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID
Marcus Clauss, Clinic of Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich
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Plant species studied
White sweet clover
(Melilotus alba Medik.)
Narrowleaf hawksbeard
(Crepis tectorum L.)
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Why study these plant species?
• Moose have been
observed grazing on
M. alba when the
plant has mature
seed
• C. tectorum has been
observed growing out
of collections of
moose feces in the
wild C. McKay 03/15/07
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Infestations in Alaska
• Yellow dots are C.
tectorum
• Red dots are M. alba
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Seeds
M. alba C. tectorum
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Materials and Methods
• Seeds were collected in the summer of
2008 from plants around the UAF campus
• Germination tests determined 36% and
93% viability of M. alba and C. tectorum,
respectively
• Seeds were divided into four replications
of 5,500 M. alba and 10,600 C. tectorum
germinable seeds
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Materials and Methods
• Moose used in the
study are located at
the University of
Alaska Fairbanks
Agricultural and
Forestry Experiment
Station, Matanuska
Experiment Farm,
Palmer, Alaska
• The moose are tame
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Materials and Methods
• Moose were fed a diet
of brome grass
(Bromus inermis)
silage beginning 21 D
before the trial and
throughout the
feeding trial
• Silage did not contain
viable seed
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Materials and Methods
• On October 19, 2008
each dose of seeds
was mixed with
approximately 100ml
of canned pumpkin
immediately before
feeding the moose
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Feeding the Moose
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Force feeding the Moose
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Materials and Methods
• Moose were kept in
separate digestion
balance stalls
• All fecal material was
collected, bagged,
and frozen at -10°C
each day for the next
11 days
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Materials and Methods
• November 17, 2008 all fecal material was
placed in the greenhouse (18 C) to thaw
• The following day, fecal material was
placed in 28 x 53 x 6 cm plastic trays to a
depth of 2 to 4 cm
• 3 to 7 trays were needed for each moose
for each day
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Setting up greenhouse study
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Materials and Methods
• The greenhouse was
kept at 18 C with a
13/11 hr day/night
cycle
• Trays were watered
as needed and
covered with plastic
domes to reduce
evaporation
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Materials and Methods
• Before watering, M.
alba, C. tectorum and
other species were
counted and removed
• Unknown seedlings
that were not M. alba
and C. tectorum were
transplanted and
grown until identified
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Materials and Methods
• After 7 wk, when new seedling numbers
were quite reduced, fecal material was air
dried in the greenhouse for 2 wk, weighed,
and combined
• Our observation was that seedlings were
mainly coming from the surface of the
fecal pellet so a follow-up study was
conducted
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Materials and Methods
• 4 subsamples (> 1 kg
each) were sent to
Fairbanks
• Half was weighed,
dried at 60 C for 48 hr
and weighed
• Half was sieved
through a 5.6 mm
mesh (No. 3.5) after
moistening
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Materials and Methods
• The sieved material
was placed in trays to
a depth of 2 cm and
watered
• Trays were placed in
a seed germinator set
to 15 C with a 12/12
hr day/night cycle
• Emerging seedlings
were identified
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Results
• C. tectorum
– 42,000 germinable seed produced 5
seedlings
• 4 from one moose 1 DAF (days after feeding)
• 1 from another 3 DAF
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Results
• C. tectorum
– 42,000 germinable seed produced 5
seedlings
• 4 from one moose 1 DAF (days after feeding)
• 1 from another 3 DAF
• M. alba
– 22,000 germinable seed produced 3,595
seedlings
• 16% survived mastication and digestion
• Of those 39% came from inside the pellet
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Results – M. alba
0
200
400
600
800
1000
1200
1400
1600
1800
2000
1 2 3 4 5 6 7 8 9 10 11
Days after feeding
Seed
lin
g n
um
ber
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Results – M. alba
Passage time
0
100
200
300
400
500
600
1 2 3 4 5 6 7 8 9 10 11
Days after feeding
Seed
lin
g n
um
ber
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Results – M. albus
Seed passage based on feces dry weight
0
50
100
150
200
250
300
350
400
450
1 2 3 4 5 6 7 8 9 10 11
Days after feeding
Seed
lin
gs/k
g f
eces
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Results – M. alba
Rate of seed passage
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11
Days after feeding
Cu
mu
lati
ve %
of
seed
lin
gs
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Results
• Other species identified during the study
– Common lambsquarters (Chenopodium
album L.)
– Common chickweed (Stellaria media (L.) Vill.)
– An unknown grass
• Two are common agricultural weeds
• Both were available before moose were
penned
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Conclusion
• Seed dispersal of
non-indigenous plant
species is a concern
• M. alba seed typically
does not fall far from
the plant
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Conclusion
• Seed dispersal of
non-indigenous plant
species is a concern
• M. alba seed typically
does not fall far from
the plant
• But things happen
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Conclusion
• M. alba seed floats
• If it gets to a river the
rate of spread can
increase
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Conclusion
• Blaine Spellman
determined that M.
albus will negatively
impact many native
pioneer plant species
along braided glacial
streams
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Conclusion
• Endozoochorous dispersal of M. alba is a
new concern
– M. albus produces up to 300,000 seed/plant
– Viable seed are on the plant from late
summer on into winter
– Moose can move considerable distances in a
day
– Moose feces are a suitable habitat for seed
germination and seedling establishment
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Conclusion • Currently along the Dalton Highway, volunteers
try to keep M. alba from setting seed within 30 m
of river crossings
• Is this enough?
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Conclusion
• This is a report of one animal and two
plant species
• There are many other wildlife – non-native
indigenous species interactions that could
result in the enhanced spread of
potentially ecosystem altering organisms
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Conclusion
• Mule deer have been
observed eating M.
alba in the Yukon
• And deer are known
to spread spotted
knapweed (Centaurea
stoebe) and leafy
spurge (Euphorbia
esula) [Wallander, Olson, and
Lacey 1995; Olson and Wallander
2002]
C. Domes
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Acknowledgements
• Erin Carr, September Martin, and Jennifer
Kapla – USDA/ARS
• Committee for Noxious and Invasive Plant
Management (CNIPM)
• AKEPIC plant database
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Managing Reed Canarygrass on the Kenai Peninsula
Before, Now and the Future
Blaine T. Spellman
D. Koester
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Reed Canary Grass (RCG) Biology
Barry Rice, bugwood.com
• Eurasian variant is aggressive.
• Likely brought to Alaska as a soil stabilizer and forage crop.
• Up to 6+ feet tall.
• Spreads via seed and rhizome.
• Grows well in wetlands.
Spreading rhizome makes extensive root mass
Closed and open panicles
T. Miller
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RCG Habitat
road sides pastures / hayfields
lake / stream margins
Grows optimally in
wet habitat.
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Why worry? RCG Impacts
• RCG populations are near monoculture along hundreds of miles of streams in the Pacific Northwest (Miller 2007).
• RCG is likely displacing native vegetation through competitive exclusion.
• RCG drastically modifies stream flow through sedimentation.
• RCG alterations have unknown consequences on stream invertebrates, waterfowl, rodents, and
SALMON.
encroaches on active channels
B. Spellman
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RCG – Scenario 1
Displaces native
grass/sedge and clogs
streams!
reed canary
grass
sockeye
Loss of salmon
spawning beds?
Black Bear
Less food, less
bears?
Less food in the
freezer, need more
$$$
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RCG Management Plan
To effectively manage RCG the KP-CWMA decided
two components were necessary.
1. RCG Survey
•Need locations of RCG to coordinate control efforts for the future. Maybe EDRR?
•Prioritize infestations for control: Critical habitat vs. non-critical habitat.
2. Best Control Techniques
•Do methods in lower 48 work in Alaska?
•Determine cost-effective and efficient approaches to control RCG in Alaska.
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RCG Roadside Distribution (2006 data)
There are currently 259 AKEPIC points for Reed Canary Grass on the Kenai
Peninsula.
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RCG Watershed Survey - Prioritization
Kenai Peninsula CWMA
• Understood RCG is beyond eradication on the Kenai Peninsula
• During 2007-2009, shifted focus from roads to sensitive wetland habitat.
• Thousands of water bodies in the Kenai Peninsula.
• Prioritized survey efforts in wetlands both adjacent to RCG infestations and that support coho salmon.
= RCG infestation
North Fork Anchor River
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Prioritizing RCG Stream Surveys
• 51 RCG infestations
mapped in wetlands.
• 14 of 51 infestations
were adjacent to
wetlands that support
Coho salmon (Kenai Watershed Forum, 2006).
• During 2007-2009,
RCG survey of
6 streams took place.
Map made by Kenai Watershed Forum
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RCG distribution– North Fork Anchor River
Sterling Highway = RCG infestation
North Fork Road
Sterling Highway
North Fork Anchor River
North Fork Road
Sterling Highway
North Fork Anchor River
0 2 mi 1 mi
Homestead RCG spread?
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Results – North Fork Anchor River
= RCG infestation
RCG on North Fork Anchor River
• Mapped ~ 20 miles of
North Fork Anchor River.
• Found 256 RCG
infestations along the
river.
• RCG growing directly
along the active channel.
• Generally monotypic
infestations that
stretched for 100+
meters.
North Fork Anchor River
0.5 mi 0 1 mi
North Fork Road
= RCG infestation
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Kenai River
Bishop Creek
North Fork Anchor River
Beaver Creek
Additional anadromous
RCG Streams:
Anchor River
Slikok Creek
Stariski Creek
Swanson River
4 of the 6 high-priority streams had extensive RCG infestations
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What are we going to do?
![Page 90: Three Invasive Weed Species: Notes from AlaskaWilliam Collins, Alaska Department of Fish and Game, Palmer, AK Joseph Kuhl, Department of Plant, Soil, and Entomological Sciences, University](https://reader035.vdocument.in/reader035/viewer/2022070718/5ede3e48ad6a402d66698fc2/html5/thumbnails/90.jpg)
Mechanical control can
be effective for small
RCG infestations.
M.Martin
D. Koester
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Tarping material might be more feasible for
controlling RCG infestations on large and flat
sites such as field edges and boat launches.
D. Koester
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Larger RCG infestations, or
those in rough or wet
ground, may require
applications of herbicide for
full control. G. Grazziano
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tarp
RCG Control Experiment Methods
• Two sites (Soldotna & Anchor Point)
• Control and 3 treatments
• 6 replicates per treatment (3 per site)
• Plots are 10’ x 20’
• Started 2008 and ends 2010
control
+
Mow + spray spray
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RCG Control Experiment Results
control spray spray+mow tarp
% R
CG
co
ntr
oll
ed
in
1s
t ye
ar
0
50
100
a
b b c
Different letters indicate statistically significant differences p >.05.
Data calculated as follows: (RCG% before – RCG% after)*100.
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control
spray & spray + mow tarp
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RCG Control Experiment Results
control spray spray+mow tarp
me
an
tim
e e
xp
en
de
d p
er
plo
t (m
inu
tes
)
0
25
50
Plots area is 10’ x 20’.
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Control Experiment Observations
• In our experiment, most cost-
effective treatments was
spraying. Time needed is low
with 90% control in 1st year.
• Mowing makes herbicide
application easier. More
feasible along road-river
interface.
• In year one, tarping resulted in
the highest mortality of RCG.
But is most labor intensive.
• Due to legal restrictions, tarping
is currently the only treatment
option in floodplain habitats.
G. Grazziano
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spray & spray + mow tarp
Spraying did not appear
to kill RCG seed and
RCG began to reinvade
plots?
Control Experiment – RCG Seed Bank
Next year we plan to
determine re-growth from
seed in tarped plots.
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RCG control Experiment - Logistic Feasibility
RCG in remote areas
• Tarping and mowing are
not practical in remote
areas.
• Of the treatments used in
our experiment, shovels
and backpack sprayer
only feasible option for
remote areas.
M.Martin
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Discussion – Survey Results
= RCG infestation
RCG on North Fork Anchor River
• Our RCG management plan
needs fine tuning.
• RCG on certain anadromous
streams of the Kenai
Peninsula are beyond
eradication.
• Prevention – prevent RCG
spreading by controlling
road-river interfaces.
• EDRR – create a list of
salmon streams most likely
to be impacted by RCG and
survey them routinely.
North Fork Anchor River
0.5 mi 0 1 mi
North Fork Road
= RCG infestation
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Preventing the Spread
• RCG may still be used to
revegetate disturbed soils
on the Kenai Peninsula.
• RCG is still being used as
a forage and hay crop on
the Kenai Peninsula.
• It might be prudent to
restrict the use and
transport of RCG seed.
Could RCG be an addition to the Alaska State-Listed Noxious Weeds?
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Preventing the Spread
• Routinely survey all road
crossings that intersect
anadromous streams that
have none to low
abundances of RCG.
• Work with state and borough
to use best control methods.
-Create a 100 m buffer
around anadromous stream
bridges.
Creating a buffer around the road-river
interface may prevent RCG invading other
anadromous streams.
!.
!.
!.
Stariski Creek
Sterling Highway
0.5 mi 0.25 mi 0
= RCG infestation
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EDRR after all
EDRR
• Create a list of critical anadromous
streams to monitor (e.g. small
streams with large salmon
populations).
• Focus on anadromous streams
with none to low RCG abundance.
• Develop routine monitoring
program. Involve citizen monitors
and Kenai Peninsula-CWMA
partners.
Through concerted efforts, we feel the Kenai Peninsula
CWMA can keep RCG off of many anadromous streams of
the Kenai Peninsula!
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Acknowledgements
Special Thanks: Hans Klaussner, Gino Grazziano, Caleb Clemmons, Sarah Easton,
Doug Koester, Tyler Hass, Dillon Brady, Daren Brady, Kaleb Henderson & family,
Janice Chumley, and Phil North.
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