Weed Identification - NCSU
Transcript of Weed Identification - NCSU
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Weed Identification
Fike Teaching Garden
July 11, 2017
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Identifying Grass (Monocot)
Species
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Plant Parts: Ligule
• Membrane or fringe of hair above the leaf
collar on a grass plant
Large crabgrass
Membranous
Barnyardgrass
Absent
Bermudagrass
Fringe of hairsGoosegrass
Truncate
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Plant Parts: Auricle
• An ear-lobe shaped projection growing from
the base of the sheath at the collar region of
some grasses
Quackgrass
Claw-like
Tall fescue
Rounded
Giant foxtail
Absent
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Plant Parts: Sheath
• The lower part of the leaf that surrounds the
stem (culm) of the grass plant
Split Overlap
Large crabgrass
Fused
Smooth bromeFall
Panicum
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Plant Parts: Vernation
• The arrangement of the youngest leaf in the
bud shoot
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Plant Parts: Stems
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Plant Parts: Seedheads
Italian ryegrass
SpikeMain axis does not
branch.
Spikelets are stalkless.
Dallisgrass
RacemeMain axis does not branch.
Spikelets are stalked
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Plant Parts: Seedheads
Barnyardgrass
PanicleMain axis branches.
Spikelets are stalked.
Johnsongrass
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Plant Parts: Specialized Stems
Rhizome
below ground specialized
stems
Johnsongrass
Stolon
above ground specialized
stems
Bermudagrass
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CS 152 Grass Chart
Ligule Collar Hair
Leaf Hair
Comments
(1) broadleaf signalgrass
H Short Total Hair on bottom leaf only when young – large seed
(2) large crabgrass M Short Total Easy ligule to see,
complete hair
(3) crowfootgrass M Short Total Distinct seed pods,
evenly spaced hairs along margin
(4) goosegrass M Long None Folded leaf, often
has silvery appearance
(5) barnyardgrass None Rare None No Ligule
(6) fall panicum M/H Short 1st leaf Tall hairy ligules
(7) Texas panicum H Short Total Lots of hair,
persistent seed (large)
(8) dallisgrass M Short Total Much like crabgrass
(9) giant foxtail H Short total Short hairs to end
of leaf – all hair
(10) yellow foxtail H Long Long Leaf hair on 3rd of
leaf surface
(11) green foxtail H Rare None No hairs on leaves
(12) johnsongrass M Long Sparse Looks similar to
corn seedling
(13) annual bluegrass
M None None Boat shaped leaf tip
(14) Italian ryegrass M Rare None Auricles present
except on very young seedlings
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Using Our Knowledge of Plant Parts to
Make an ID
Large Crabgrass Goosegrass
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Grass and Grass-like Weeds
© 2008, Steven A. Gower, Michigan State Univ.
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© 2008, Steven A. Gower, Michigan State Univ.
Yellow nutsedgeCyperus esculentus
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Yellow nutsedgeCyperus esculentus
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© 2008, Steven A. Gower, Michigan State Univ.
Yellow nutsedgeCyperus esculentus
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Purple nutsedgeCyperus rotundus
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Smooth crabgrassDigitaria ischaemum
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© 2008, Steven A. Gower, Michigan State Univ.
Large crabgrass
Digitaria sanguinalis
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© 2008, Steven A. Gower, Michigan State Univ.
Large crabgrassDigitaria sanguinalis
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© 2008, Steven A. Gower, Michigan State Univ.
Large crabgrassDigitaria sanguinalis
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© 2008, Steven A. Gower, Michigan State Univ.
Large crabgrassDigitaria sanguinalis
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© 2008, Steven A. Gower, Michigan State Univ.
Large crabgrassDigitaria sanguinalis
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© 2008, Steven A. Gower, Michigan State Univ.
BarnyardgrassEchinochloa crus-galli
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© 2008, Steven A. Gower, Michigan State Univ.
BarnyardgrassEchinochloa crus-galli
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© 2008, Steven A. Gower, Michigan State Univ.
BarnyardgrassEchinochloa crus-galli
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© 2008, Steven A. Gower, Michigan State Univ.
BarnyardgrassEchinochloa crus-galli
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GoosegrassEleusine indica
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Fall panicumPanicum dichotomiflorum
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© 2008, Steven A. Gower, Michigan State Univ.
Fall panicumPanicum dichotomiflorum
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© 2008, Steven A. Gower, Michigan State Univ.
Fall panicumPanicum dichotomiflorum
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Texas panicum
Urochloa texanum
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Texas panicum
Urochloa texanum
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Annual bluegrassPoa annua
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© 2008, Steven A. Gower, Michigan State Univ.
Annual bluegrassPoa annua
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© 2008, Steven A. Gower, Michigan State Univ.
Giant foxtailSetaria faberi
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© 2008, Steven A. Gower, Michigan State Univ.
Giant foxtailSetaria faberi
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© 2008, Steven A. Gower, Michigan State Univ.
Giant foxtailSetaria faberi
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© 2008, Steven A. Gower, Michigan State Univ.
Yellow foxtailSetaria pumila
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© 2008, Steven A. Gower, Michigan State Univ.
Yellow foxtailSetaria pumila
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© 2008, Steven A. Gower, Michigan State Univ.
Yellow foxtailSetaria pumila
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© 2008, Steven A. Gower, Michigan State Univ.
Green foxtailSetaria viridis
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© 2008, Steven A. Gower, Michigan State Univ.
Green foxtailSetaria viridis
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Broadleaf signalgrassUrochloa platyphylla
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Identifying Broadleaf (Dicot)
Weeds
Leaf Parts
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Plant Parts: Arrangement of leaves on
the stem
Whorled
Carpetweed
Poorjoe
Opposite
Alternate
Arrowleaf sida
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Plant Parts: Leaf StructureSimple or sessile
leaf without petiole
Bristly starbur
Palmately
compound
Giant ragweed
Balloonvine
Biternate
Pinnately compound
Sicklepod
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Plant Parts: Leaf Shape-1
Tall morningglory
Cordate (heart-shaped)
Lanceolate(lance-shaped)
Eclipta
Wild radish
Lyrate
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Plant Parts: Leaf Shape-2
Sagittate
Common arrowhead
Ovate
Palmer amaranth
Reniform (kidney-shaped)
Ground ivy
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Plant Parts: Leaf Shape-3
Linear
Poorjoe
Runcinate (lacerated aspect with
the projection pointing
away from the apex)
Dandelion
Oblanceol
ate
Bracted plantain
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Broadleaf Weeds
© 2008, Steven A. Gower, Michigan State Univ.
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Palmer amaranthAmaranthus palmeri
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Palmer amaranth
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Palmer amaranth
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Redroot pigweedAmaranthus retroflexus
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Redroot pigweed
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Redroot pigweed
© 2008, Steven A. Gower, Michigan State Univ.
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© 2008, Steven A. Gower, Michigan State Univ.
Redroot pigweed
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© 2008, Steven A. Gower, Michigan State Univ.
Redroot pigweed
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Common waterhempAmaranthus rudis
© 2008, Steven A. Gower, Michigan State Univ.
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Common waterhemp
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Common waterhemp
© 2008, Steven A. Gower, Michigan State Univ.
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Common waterhemp
© 2008, Steven A. Gower, Michigan State Univ.
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Common waterhemp
© 2008, Steven A. Gower, Michigan State Univ.
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Common waterhemp
© 2008, Steven A. Gower, Michigan State Univ.
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© 2008, Steven A. Gower, Michigan State Univ.
Common ragweedAmbrosia artemisiifolia
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© 2008, Steven A. Gower, Michigan State Univ.
Common ragweed
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© 2008, Steven A. Gower, Michigan State Univ.
Common ragweed
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© 2008, Steven A. Gower, Michigan State Univ.
Common ragweed
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© 2008, Steven A. Gower, Michigan State Univ.
Common ragweed
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© 2008, Steven A. Gower, Michigan State Univ.
HorseweedConyza canadensis
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© 2008, Steven A. Gower, Michigan State Univ.
Horseweed
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© 2008, Steven A. Gower, Michigan State Univ.
Horseweed
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© 2008, Steven A. Gower, Michigan State Univ.
Horseweed
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© 2008, Steven A. Gower, Michigan State Univ.
Horseweed
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© 2008, Steven A. Gower, Michigan State Univ.
Horseweed
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© 2008, Steven A. Gower, Michigan State Univ.
Horseweed
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Common cockleburXanthium strumarium
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Common cocklebur
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© 2008, Steven A. Gower, Michigan State Univ.
Common cocklebur
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Common cocklebur
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© 2008, Steven A. Gower, Michigan State Univ.
Common cocklebur
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Common lambsquartersChenopodium album
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Common lambsquarters
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© 2008, Steven A. Gower, Michigan State Univ.
Common lambsquarters
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© 2008, Steven A. Gower, Michigan State Univ.
Common lambsquarters
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© 2008, Steven A. Gower, Michigan State Univ.
Common lambsquarters
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© 2008, Steven A. Gower, Michigan State Univ.
Common lambsquarters
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Red morninggloryIpomoea hederifolia L
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Red morningglory
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Ivyleaf morninggloryIpomoea hederacea
© 2008, Steven A. Gower, Michigan State Univ.
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© 2008, Steven A. Gower, Michigan State Univ.
Ivyleaf morningglory
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Pitted morninggloryIpomoea lacunosa
© 2008, Steven A. Gower, Michigan State Univ.
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Pitted morningglory
© 2008, Steven A. Gower, Michigan State Univ.
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Tall morninggloryIpomoea purpurea
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© 2008, Steven A. Gower, Michigan State Univ.
Tall morningglory
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Tall morningglory
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Cypressvine morninggloryIpomoea quamoclit L
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Cypressvine morningglory
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Palmleaf morningglory
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Palmleaf morningglory
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Smallflower morningglory
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Smallflower morningglory
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Tropic croton
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Tropic croton
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Velvetleaf
© 2008, Steven A. Gower, Michigan State Univ.
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© 2008, Steven A. Gower, Michigan State Univ.
Velvetleaf
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Velvetleaf
© 2008, Steven A. Gower, Michigan State Univ.
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© 2008, Steven A. Gower, Michigan State Univ.
Velvetleaf
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Sicklepod
Senna obstusifolia
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SicklepodSenna obstusifolia
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JimsonweedDatura stramonium
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JimsonweedDatura stramonium
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GroundcherryDatura stramonium
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GroundcherryDatura stramonium
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LadysthumbPolygonum persicaria
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LadysthumbPolygonum persicaria
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Pennsylvania smartweedPolygonum persicaria
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Pennsylvania smartweedPolygonum pensylvanicum
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Ladysthumb Pennsylvania smartweed
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Questions?