|
Cotton
> Year-Round IPM Program > Crop Emergence—Seedling
Growth > Summer Annual Weed Seedlings
Cotton
Summer Annual Weed Seedlings You May See: Crop Emergence to Seedling Growth
Each name links to more information on identification and biology. See the weed photo gallery for more
weeds.
Click on photos to enlarge
Summer Annuals
Lambsquarters
Identification tip: Seed leaves are narrow, with nearly parallel sides. The seed leaves and
early true leaves are dull bluish-green above and often purple below. |
Nightshade
Identification tip: Seed leaves of black nightshade are elongate-oval and pointed; the first
true leaves are spade-shaped with smooth edges. Lower surfaces are often purple. |
Barnyardgrass
Identification tip: The first blade opens parallel to the ground and is linear. Leaves have
no auricle or ligule and are rolled in the bud. Collar is green and smooth, and sheaths are somewhat compressed
and tinted maroon toward the base. Stems of young barnyardgrass plants often grow outward along the ground
before turning upward. |
Chinese thornapple
Identification tip: Cotyledons are lance-shaped and 8 to 10 times as long as they are wide,
and taper gently to a point at the end. They are a gray-green in color and are covered with soft downy hair.
The stem
is purplish-black in color below the seedling leaves. The first two leaves are egg-shaped, while
subsequent leaves are broadly oval, angular to triangular in shape, and have a wavy, scalloped margin. |
Junglerice
Identification tip: Seedling leaves are grayish or dull green. It is closely related to barnyardgrass
and looks similar except for the distinctive purple bands on leaves. These bands may be present even on seedlings.
There are no auricles or ligules in the collar region. |
Morningglories
Identification tip: Morningglories, often called annual morningglories, have heart-shaped,
first true leaves with deep lobes at the base. Hypocotyls are maroon at the base and green toward the apex.
Seedling leaves are deeply notched. |
Pigweeds are annual plants that germinate from seeds from late winter
through summer.
Identification tip: Seedlings of all common pigweeds are similar. Seed leaves are long and
narrow and are often red underneath. Prostrate pigweed forms dense mats. Leaves have distinctive light-colored
edges. |
Groundcherries
Identification tip: Cotyledons are yellow-green to gray-green. First leaves are oval to triangular,
have smooth or slightly wavy margins, and give off a strong odor when crushed. |
|
Perennials
Nutsedge, yellow or purple
Identification tip: Nutsedges grow mainly from tubers or "nutlets" formed on rhizomes,
mostly in the upper foot of soil. Leaves are V-shaped in cross section and arranged in sets of three at the
base. Stems are triangular in cross section. |
|
