University of Missouri Extension

IPM1007, Revised November 2009

Practical Weed Science for the Field Scout: Corn and Soybean

Pigweed, redroot (Amaranthus retroflexus)

Summer annual broadleaf

Redroot  pigweed Redroot  pigweed
 

Redroot  pigweedAn erect summer annual that may reach as much as 6-1/2 feet in height. Cotyledons are narrow and have a reddish tint. First true leaves are alternate, ovate in shape, and are slightly notched at the tip of the leaf blade. Hairs may occur on the leaf margins and along veins, especially along the lower leaf surfaces. Stems also have short hairs especially near the upper portions of the plant. Mature plants have leaves that are alternate, ovate in outline, with petioles that reach 1/2 inch in length. Flowers are inconspicuous and produced in dense, compact terminal and axillary panicles that are prickly to the touch.
 

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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