1.27.97
The Virtual WeedPatch
id.html
seedlingID.html
Weed Identification: Seedlings
Weed seedling identification is both the most important time to ID
weeds to aid management decisions, as well as the most difficult time in
a weed's life cycle to make that ID: they are small and few features are
apparent.
One good way to learn weed seedlings is by the order
in which they emerge in crop fields in the spring.
Proceed through each of the weed species below:
Composite (Compositae) Family
dandelion (Taraxacum officinale) Perennial
common cocklebur (Xanthium strumarium)
Summer annual
Ragweed species-group:
-common ragweed (Ambrosia artimeisiifolia) Summer annual
-giant ragweed (Ambrosia trif
Thistle species-group:
-Canada thistle (Circium arvense) Perennial
-biennial thistles:
--musk thistle
--bull thistle (Circium vulgare) biennial
Dogbane ( ) Family
hemp dogbane
Grass (Graminaceae; Poaceae) Family
quackgrass (Elytrigia repens ) Perennial
barnyardgrass
Foxtail species-group:
-bristly foxtail (Setaria verticillata) summer annual
-green foxtail (Setaria viridis) summer annual
-giant foxtail (Setaria faberi) summer annual
-knotroot foxtail (Setaria geniculata) summer annual
-yellow foxtail (Setaria glauca) summer annual
Panicum species-group:
-wild proso millet (Panicum mileaceum) summer annual
-fall panicum
-witchgrass
Crabgrass species-group:
-large crabgrass (Digitaria sanguinalis) summer annual
-smooth crabgrass (Digitaria ischaemum) summer annual
Sorghum species-group:
-johnsongrass
-sorghum-almum
-shattercane
woolly cupgrass (Eriochloa villosa) summer
annual
Lambsquarters (Chenopodiaceae) Family
common lambsquarters (Chenopodium album) Summer annual
Mallow (Malvaceae) Family
velvetleaf (Abutilon theophrasti) Summer annual
The Milkweed (Asclepiadaceae) Family
Mustard (Cruciferea) Family
field pennycress (Thlaspi arvense) Winter
annual
shepard's purse (Capsella bursa-pastoris)
Annual/Winter annual
wild mustard (Sinapis arvensis) annual/winter
annual
Nightshade ( ) Family
jimsonweed
Pigweed (Amaranthaceae) Family
Smartweed (Polygoneaceae) Family
Knotweed species-group:
-prostrate knotweed (Polygonum aviculare) Summer annual
-erect knotweed (Polygonum erectum) summer annual
Smartweed species-group:
-Pennsylvania smartweed (Polygonum Pensylvanicum) summer annual
-Ladysthumb (Polygonum persicaria) summer annual
