University of Missouri Extension

IPM1007, Revised November 2009

Practical Weed Science for the Field Scout: Corn and Soybean

Amaranth, Palmer (Amaranthus palmeri) also Palmer pigweed

Summer annual broadleaf

Palmer amaranth
Palmer amaranth

An erect summer annual pigweed that may reach 6-1/2 feet in height. Seedlings have cotyledons that are narrow and green to reddish in color. First true leaves are alternate, ovat e in shape, and slightly notched at the tip of the leaf. Mature leaves are alternate, without hairs, and lance-shaped or egg-shaped in outline. Leaves are 2 to 8 inches long and 1/2 to 2-1/2 inches wide and occur on petioles that are usually longer than the leaves. Stems are without hairs. Seedheads are terminal panicles that reach 1/2 to 1-1/2 feet in length. Smaller lateral inflorescences also occur between the stem and the leaf petioles.
Palmer amaranth Palmer amaranth Palmer amaranth
 

IPM1007, revised November 2009

Wild thing
 

IPM1007 Practical Weed Science for the Field Scout: Corn and Soybean | University of Missouri Extension

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