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Caring for Your Land Series of Workshops
Invasive Species
Terrestrial Plants
Module 2
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2Module 2
Terrestrial plants - background
Every plant has a native range Native to N. America means
here before European settlement
Non-native species have come from all over the world
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3Module 2
Terrestrial plants - background
Exotic plants are always exotic
Most invasive plants were planted
New introductions are still happening
Many invasives have become naturalized
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4Module 2
Terrestrial plants - Background
Invasive plants can easily colonize their new environment
Free of natural controls – herbivores, parasites and disease
Exhibit such features as: Strong vegetative growth Abundant seed production Rapid maturation
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5Module 2
Terrestrial plants - Background
Not all non-native plants are harmful
Most of our agricultural crops are exotics which pose no threat to our environment
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6Module 2
Impacts
Invasive alien plants: compete with/replace rare and endangered
species encroach upon limited habitat of rare and
endangered species reduce or eliminate localized or specialized
native plant communities, such as spring ephemeral plant communities
disrupt insect-plant associations necessary for seed dispersal of native plants
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7Module 2
Invasive alien plants:
disrupt native plant-pollinator relationships reduce and eliminate host plants for native
insects and other wildlife hybridize with native plant species, altering
their genetic makeup serve as host reservoirs for plant pathogens and
other organisms that can infect and damage desirable native and ornamental plants;
Impacts
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8Module 2
Impacts
Alien Invasive Impacts replace nutritious native plant foods with
lower quality sources kill trees and shrubs through girdling increase the incidence of plant disease and
stress in forested areas prevent seedling establishment of native
trees and shrubs reduce vigor of mature trees through shading
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9Module 2
Impacts
Invasive alien plants: reduce the amount of space, water, sunlight and
nutrients that would be available to native species
increase erosion along stream banks, shorelines and roadsides
change characteristics of the soil structure and chemistry
alter hydrological flows and conditions
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10Module 2
Controlling Invasive Plants
May be impossible to eradicate invasive plants that have become established
Can prevent future establishment Control is the only real option:
Chemical Mechanical Biological
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11Module 2
Controlling Invasive Plants
Mechanical Controls
Chemical Controls
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12Module 2
Species List
Amur Maple Black Locust Common Buckthorn Common Reed Dame’s Rocket Dog Strangling Vine Flowering Rush Garlic Mustard Glossy Buckthorn
Japanese Knotweed Manitoba Maple Norway Maple Purple Loosestrife Scots Pine Smooth Brome Grass Wild Parsnip
Species List
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13Module 2
Amur Maple (Acer ginnala)
Origin: eastern Asia
How it came to Ontario: - commonly planted as an
ornamental
- plants seeded into nearby open areas
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14Module 2
Amur Maple - Identification
leaves narrow and triangular, brilliant red in autumn
leaves have 2 short basal lobes
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15Module 2
Amur Maple – Similar Species
Silver Maple more lobes larger lobes smooth bark when
young tree-like shape,
not short and mushroom shaped
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16Module 2
Black Locust(Robinia pseudoacacia)
Origin: - native to the Appalachian mnts.
How it came to Ontario: Brought up by United Empire
Loyalists after the U.S. War of Independence
planted on many homesteads now widely naturalized in many
areas
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17Module 2
Black Locust - Identification
leaves compound with a terminal leaflet
a pair of spines at the base
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18Module 2
fruit a flat pea pod with small dark seeds
Black Locust - Identification
• flowers showy, white drooping clusters in early summer
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19Module 2
Honey Locust singly or doubly
compound flowers greenish white no terminal bud or leaflet
on its compound leaf thorns smooth, sharp,
reddish, 3 branched or more
Fruit is more twisted
Black Locust – Similar Species
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20Module 2
Highly invasive Tend to dominate certain niches Does not spread rapidly from major
concentrations Readily forms clones through root
sprouts
Black Locust – Impacts
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21Module 2
Canada thistle (Cirsium arvense)
Origin: introduced from Europe in the 17th
century probably in crop seed
How it came to Ontario: once introduced it spreads quickly seeds are light and easily windblown seeds also float and disperse in water seeds continued to contaminate crop
seed
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22Module 2
Canada thistle differs from other thistles as it has: small numerous
purple flower heads stems without spines almost spineless
flower heads vigourous creeping
roots
Canada Thistle - Identification
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23Module 2
Canada Thistle – Similar species
Bull Thistle
Sow Thistle
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24Module 2
Canada Thistle - Impact
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25Module 2
Common (European) Buckthorn (Rhamnus cathartica)
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26Module 2
Common Buckthorn - Origin
a native of Eurasia and North Africa
not recorded in Canada until the late 1890s
imported from Europe used for hedges and
windbreaks
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27Module 2
Common Buckthorn - Introduction
easily spread by birds which eat the fruit and deposit seeds far and wide
very hardy and has no diseases
absent from the Canadian shield
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28Module 2
Common Buckthorn - Range Map
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29Module 2
Common Buckthorn - Identification
coarse shrub or tree (up to 6m height)
spine tipped short shoots (not thorns)
leaves usually opposite strongly curved leaf
veins black berrylike fruit in
dense clusters
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30Module 2
Common Buckthorn - Characteristics
retains its leaves well into fall
typically found in pastures, fencerows, clearings
More common following ice storm
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31Module 2
Common Buckthorn - Similar species
Glossy buckthorn alternate shiny leaves straight leaf veins Smooth leaf margins fruit in small clusters
or individually
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32Module 2
Common Buckthorn - Impacts
Displaces native shrubs
can form almost pure stands
Interferes with natural succession
Alternate host for crown rust fungi which affects oats
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33Module 2
Common Buckthorn - Control Methods
all control methods require follow up treatment pulling herbicides fire will top kill
Buckthorn
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34Module 2
Dame’s Rocket (Hesperis matronalis)
Origin: native to Eurasia introduced to North America
in the 1600’s
How it came to Ontario a prolific seed producer commonly included in
wildflower mixes
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35Module 2
Dame’s Rocket - Range Map
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36Module 2
Dame’s Rocket- Identification
large showy purple-pink flowers
flowers with four petals
2-3’ high leaves long,
moderate in width, and toothed
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37Module 2
Dog Strangling Vine (Cynanchum medium)
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38Module 2
Dog Strangling Vine - Origin & Introduction
Origin: native to Europe first grown in Massachusetts as an
ornamental
How it came to Ontario: brought to Canada during the
Second World War to be evaluated as a filler for lifejackets (seeds are bouyant)
it subsequently escaped from research plots
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39Module 2
Dog Strangling Vine- Identification
Perennial 50-150 cm high 5 lobed purple flowers vine, stems intertwining leaves opposite, simple
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40Module 2
Dog Strangling Vine - Identification
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41Module 2
Dog Strangling Vine - Impacts
forms dense patches limits recreational use (hence
the common name) excludes all other species
and dominate sites indefinitely
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42Module 2
Flowering Rush (Butomus umbellatus)
Origin: native to Europe
How it came to Ontario: first seen in Canada in Montreal in
1897 spread rapidly up and down the St.
Lawrence Gananoque by 1940
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43Module 2
Flowering Rush - Range Map
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44Module 2
Flowering Rush - Identification
perennial aquatic shoreline herb long, linear 3-angled fleshy leaves leaves erect or may float on the
surface single flowering stem overtops
leaves showy cluster of flowers
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45Module 2
Garlic Mustard (Alliaria petiolata)
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46Module 2
Garlic Mustard - Origin and Introduction
Origin: native of Europe and Asia
How it came to Ontario: probably introduced
deliberately in to North America
valued as a herb and for medicinal value
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47Module 2
Garlic Mustard - Range Map
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48Module 2
Garlic Mustard - Identification
up to 1m tall alternate stalked leaves
heart shaped, rounded or triangular blades
leaves smell like garlic small white flowers,
with four petals seeds in long narrow
capsules
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49Module 2
Garlic Mustard - Characteristics
grows in a variety of disturbed and natural sites
prefers partial shade deciduous woodlands,
floodplain forests, forest edges, hedgerows
thrives in soils high in lime, not found on Canadian shield
Bi-annual plant
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50Module 2
Garlic Mustard - Impacts
found in 37 national and provincial parks and ANSI’s
forms dense monocultures
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51Module 2
Garlic Mustard - Control Methods
fire mechanical removal
cutting at ground level before or after flowering but before seed set effective
repeated treatments required
hand pulling effective for small infestations
herbicides
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52Module 2
Glossy Buckthorn (Rhamnus frangula)
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53Module 2
Glossy Buckthorn - Origin and Introduction
Origin:- native to Eurasia and North
Africa
- imported to North America as horticultural stock in the late 1800’s
How it came to Ontario:- naturalized throughout the
northeastern U.S. and southeastern Canada
- seeds dispersed with feces of birds
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54Module 2
Glossy Buckthorn - Identification
Large shrub or small tree, up to 7m older stems are mottled with
lenticels twigs are grey and hairy leaf bladed have 5-10 pairs of
straight veins flowers greenish white fruit black, attached singly or in
small clusters no thorns or spines
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55Module 2
Glossy Buckthorn - Characteristics
typically found in wetland habitats: swamps, fens, and sometimes bogs
also found on woodland edges, fencerows and old fields
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56Module 2
Glossy Buckthorn - Impacts
one of the most aggressive invasives of wetland habitats
growth can be dense enough to exclude other native species
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57Module 2
Glossy Buckthorn - Impacts on other species
berries food for a variety of wildlife
birds spread the seeds far and wide
competes for habitat with native saplings and shrubs
alternate host of oat crown rust fungi
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58Module 2
Glossy Buckthorn- Control Methods
fire may be an effective control if annual burns are maintained for 5-6 years
herbicides mechanical all treatments will need
to be repeated to get re-sprouts and new seedlings germinating from the seed bank
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59Module 2
Japanese Knotweed (Polygonum cuspidatum)
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60Module 2
Japanese Knotweed - Origin and Introduction
Origin:- native to Asia
How it came to Ontario:- brought to North America
as an ornamental in the late 1800’s
- rapidly spread through vegetative reproduction
- plant fragments are transported with soil
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61Module 2
Japanese Knotweed - Identification
perennial herb hollow bamboo-like
stems heart shaped leaves deep root system with spreading
rhizomes (out to 20 m)
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62Module 2
Japanese Knotweed - Identification
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63Module 2
Japanese Knotweed - Impacts
deep roots make it hard to eradicate
On other species: dense, pure stands crowd out
native vegetation deep roots take water and
nutrients from native vegetation
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64Module 2
Control Methods
pulling plants up is only partially effective plants can regenerate from very small pieces
of root left in soil
cutting stalks, followed by an application of a herbicide is very effective may need to be applied several times over 2-
3 years to effectively kill all rhizomes
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65Module 2
Manitoba Maple (Acer negundo)
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66Module 2
Manitoba Maple - Origin and Introduction
Origin:- native to North America
- originally found in riparian woodlands in the eastern prairies and plains
How it came to Ontario:- always found in extreme SW Ontario
- now widely introduced and naturalized throughout eastern Canada
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67Module 2
Manitoba Maple - Identification
compound leaves, 3-9 leaflets
leaflets with shallow irregular lobes or teeth, often asymetrical
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68Module 2
Norway Maple (Acer platanoides)
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69Module 2
Norway Maple - Origin and Introduction
Origin: native to Europe
How it came to Ontario: widely planted as an
ornamental has become naturalized
in many areas
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70Module 2
Norway Maple - Identification
milky juice exudes from cut leaf stalks
fruits with wings spread apart very wide
seeds produced abundantly in most years
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71Module 2
Similar Species
Norway Sugar
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72Module 2
Norway Maple - Impacts
aggressively colonizes sites- abundant seed production
has caused erosion problems in some Toronto ravines by shading out understory vegetation
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73Module 2
Purple Loosestrife (Lythrum salicaria)
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74Module 2
Purple Loosestrife - Origin and Introduction
Origin:- native to Europe
- plants were brought by settlers for their flower gardens
- seeds were present in soil used for ballast in sea-going ships
How it came to Ontario:- since introduction, Purple
Loosestrife has steadily spread westward
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75Module 2
Purple Loosestrife - Identification
individual flowers have 5 or 6 pink-
purple petals surrounding small,
yellow centers
each flower spike is made up of many individual flowers
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76Module 2
Purple Loosestrife - Characteristics
commonly found in wet areas wetlands poorly drained agricultural land (hayfields)
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77Module 2
Purple Loosestrife - Impacts
190,000 ha of wetlands, marshes, pastures and riparian meadows impacted annually
On habitat:- degrades wetland habitat
- chokes out fish spawning habitat
- competes with wild rice- a valuable food plant for wildlife
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78Module 2
Control Methods
hand pulling easiest with: small infestations young plants can be used to prevent spread from infested
areas need to remove as much of root system as
possible
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79Module 2
Control Methods
Cutting Chemical Biological
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80Module 2
Scot’s Pine (Pinus sylvestris)
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81Module 2
Scots Pine - Origin and Introduction
Origin native from Scotland across
Eurasia to the Pacific, and
Introduction widely planted throughout
North America for several hundred years
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82Module 2
Scots Pine - Identification
needles in clusters of 2 short needles less than
3 inches long blue-green in colour
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83Module 2
Scots Pine - Impact
Can be beneficial Can be detrimental
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84Module 2
Smooth Brome Grass (Bromus inermis)
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85Module 2
Smooth Brome Grass - Origin and Introduction
Origin: native of southern Europe brought to North America as a
valuable hay and pasture crop
How it came to Ontario: escaped from cultivation
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86Module 2
Identification
stems, sheaths and blades without hairs may be some fine hairs
at the blade nodes on the stem
blades 8-15 mm wide reaches heights of 45-
50 cm
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87Module 2
Wild Parsnip (Pastinaca sativa)
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88Module 2
Origin and Introduction
Origin: native to Europe
How it came to Ontario: presumably seeds were brought in
to North America in soil used for ballast in ships
once established it has spread, particularly down highway corridors
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89Module 2
Wild Parsnip - Identification
flower yellow umbel cluster
compound leaves plants are yellow green thick juicy hollow
stalk reaches height of 6-8’
(>2m)
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90Module 2
Wild Parsnip - Similar Species
Queen Anne’s Lace (Wild carrot) is somewhat similar has finer leaves and
stem has a white flower
cluster
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91Module 2
Wild Parsnip - Control Methods
perennial plant, thick taproot
(parsnip-like) very difficult to pull
Herbicide can be effective,
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92Module 2
Presentation made possible by
Ontario Forestry Association Eastern Ontario Model Forest Human Resources Development Canada Ontario Ministry of Natural Resources
Ontario Stewardship Program
With contributions from: City of Ottawa Purdue University