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Practical Weed Science for the Field Scout: Corn and Soybean

Amaranth, Palmer (Amaranthus palmeri) also Palmer pigweed

Summer annual broadleaf

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.

 

IPM1007, revised November 2009

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