pasture weeds
Transcript of pasture weeds
Common Pasture Weeds
One annual grass
Six Biennial broadleaf weeds
Six perennial broadleaf weeds
Yellow Foxtail
We’ve seen this before
An increasing problem in pastures
Yellow Foxtail
Long hairs at base of blade and yellowish seedhead
Wild Parsnip
Wild parsnip infestation
Wild Parsnip
Wild parsnip plant
Wild Parsnip
Rosette leaves large, erect
Wild Parsnip
Leaves deeply lobed: pinnately compound
Leaflets often mitten-shaped
Petioles clasp stems
Wild Parsnip
Flowers yellow and in clusters called umbels
Here’s why it’s an umbel
Wild parsnip
Wild parsnip
Seeds in pairs
Many per plant
Burdock
Some 2-year old plants
and some 1-year old plants
Burdock
All biennials start from seeds
Burdock
Burdock young plant
Burdock
Burdock rosette
Leaves large with heart-shaped base
Burdock
Leaves dark green on top; light green & woolly below
Burdock
Stems to over 6 feet tall and wide
Branched, grooved and hollow
Burdock
Flower heads of pinkish to red-violet disc flowers
Burdock
Each fruit covered with hooked spines (bracts) that form the bur
Burdock is a common pasture weed
Maybe it should be called…..
Bat DockBird Dock
Burdock
At teddy bur!!
Musk thistle
Musk thistle plant
Musk thistle
Musk thistle rosette
Musk thistle
Leaves smooth, with grey-green margin
White, prominent midrib
Musk thistle
No hairs on bottom side of leaf
Musk thistle
Stem spiny except right below flower head
Musk thistle
Inflorescence 1.5 to 2” across
Often tip downward: nodding thistle
Musk thistle
White biotype found in one location
Plumeless thistle
Plumeless thistle plant
Plumeless thistle taking over a
fence line
Plumeless thistle
Plumeless thistle rosette
Plumeless thistle
Plumeless thistle
Leaves deeply divided
Hairy especially the lower surface midrib
Plumeless thistle
From rosette to bolting
Plumeless thistle
Stems spiny from base to tip
Inflorescence .75 to 1.5” across; pinkish
Plumeless thistle
Plumeless on left
Musk on right
Plumeless thistle
A rare biotype: white flowers
Bull thistle
Bull thistle seedling
Leaves look old early on
Bull thistle
Leaves deeply cut, with a wrinkled, gray-green surface
Spines particularly needle-like
Bull thistle
Stem appears spiny:
decurrent leaves (run down along stem)
Bull thistle
Inflorescence 1-2” across, flask-shaped
Bull and Musk thistle
Bull on left
Musk on right
Bull thistle
Mature bull thistle releasing fluff
Spotted Knapweed
Another biennial
(or short lived perennial
Loves sandy soil
Prolific seed
producer
Inhibits growth of
other plants
Leaves up to 6” long and deeply lobed
gray-green;
Surface rough/hairy
Spotted Knapweed
Stems rough-surfaced and branched
Spotted Knapweed
Flower heads with pink to purple disc flowers
up to 200/plant
Spotted Knapweed
Bracts at base of flower heads with fringed black spots
Give plant it’s name
Spotted Knapweed
Flowers very pretty
Spotted Knapweed
Curly dock
Not just a pasture weed!
Taproot fleshy and yellowish
Curly dock
Ochrea at leaf axils
Curly dock
Ochrea long and prominent
Curly dock
Basal leaves 6 to 12” long with wavy edges
Stems smooth, erect reddish
Curly dock
Seed head easily recognizable
Attractive seed heads
Curly dock
Giant chickweed
Leaves hairy,
pointed; relatively large for a chickweed
Perennial with fiborous roots
Also roots at nodes
Giant chickweed
Stems 6 to 24” long; hairy and angled
Giant chickweed
Flowers ½” wide; 5 deeply notched white petals
Giant chickweed
Fruits globular and nodding with sticky hairs on the flower stalks
Giant chickweed
Leafy spurge
Leafy spurge
Roots deep and spreading
Leafy spurge
Roots deep and spreading
Buds in crown region
Leafy spurge
Milky sap in all plant parts
Leafy spurge
Small flowers borne above greenish-yellow bracts
Leafy spurge
Fruits with 3 seeds; explode when ripe
Shoots seeds from parent plant
Common milkweed
Milkweed infestation
Common milkweed
Milky sap in all plant parts
Common milkweed
Leaves thick, oblong opposite, rounded tips
Prominent viens
Common milkweed
Roots deep and branched
Common milkweed
Milkweed and dogbane
Hemp dogbane Common Milkweed
Common milkweed
Flowers pink to white
In large ball-like clusters
Common milkweed
Pods 3-4 inches long; soft-spined
Seeds with silky pappus
Float great distances
Common milkweed
Horsenettle
Spreads by creeping roots & seeds
Horsenettle
Leaves alternate
Spiney, especially on midrib below
Oblong, with wavy edges;
Horsenettle
Stem with stout sharp spines
simple or branched
Horsenettle
Flowers potato-like
Petals white-bluish; 5-lobed in clusters
Prominent anthers
Horsenettle
Fruits green, smooth, juicy berries
berries in clusters
Horsenettle
Berries become
yellow
Horsenettle
Berries become yellow and wrinkled
Hang on plants most of winter
Canada thistle
Canada thistle infestation
Canada thistle
And here’s what we don’t normally see
Canada thistle
Creeping roots are deep and branched; grown in patches
Canada thistle
Flower heads up to ¾” wide; flask-shaped; flowers pink-purple
Canada thistle
Canada thistle fluff
Canada thistle
Canada thistle seed
~End of Pasture Weeds~