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Cotton > Year-Round IPM Program > Early Squaring

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Cotton

Summer Annual Weed Seedlings You May See—Early Squaring

All weeds found during crop emergence plus the following are seen at this time.

Each name links to more information on identification and biology. See the weed photo gallery for cotton for more weeds.

Click on photos to enlarge
Collar region of bermudagrass.
Bermudagrass collar
Identification tip: Bermudagrass leaves are rolled in the bud and the leaf sheath is flattened. The ligule is a ring of hairs and there are no auricles. The collar region of bermudagrass has a fringe of short, white hairs and the sheath is smooth and green.		 Johnsongrass seedlings.
Johnsongrass
Identification tip: Johnsongrass seedling leaves are rolled in the bud. The ligule is membranous and toothed, without auricles. Leaf blades have a prominent white midrib. The first leaf blade is 8 times longer than it is wide. 		Seedling of common cocklebur.
Cocklebur
Identification tip: True leaves on seedlings are notched on the margins and taper to the tip. Cotyledons are bright green, shiny on the upper surface, pointed, and about 6 times longer than they are wide. The bur may remain attached to the base of the seedling, helping to identify the weed when it is pulled up.
Seed leaves of velvetleaf plant.
Velvetleaf
Identification tip: Seedlings of velvetleaf, a summer annual, have one cotyledon that is round and the other may be slightly heart-shaped. Cotyledons are covered with fine, soft hairs.		 Chrysoperla carnea, green lacewing larva.
Field bindweed
Identification tip: Seed leaves are nearly square with a shallow notch at the tip. Plants sprouting from rhizomes lack seed leaves. Early true leaves are spade- or bell-shaped.		 Seedling of silverleaf nightshade, Solanum elaeagnifolium, at the one-leaf stage.
Silverleaf nightshade
Identification tip: Silverleaf nightshade, a deep-rooted perennial, has gray-green seed leaves. First true leaves have wavy margins and are covered with small star-shaped hairs.
Puncturevine seedling.
Puncturevine
Identification tip: Puncturevine seedlings have thick, elongate and brittle seed leaves, which are green above, grayish underneath, and creased along the prominent midvein. True leaves consist of 8 to 16 leaflets.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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