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Practical Weed Science for the Field Scout: Corn and Soybean

Bluegrass, annual (Poa annua)

Summer annual grass

An erect or clump-forming annual grass that tolerates close mowing, or may reach 11 inches in height. Annual bluegrass is primarily a weed of lawns, landscapes, and occasionally agronomic crops, and is found throughout the United States. Leaves are light green in color, 1/2 to 5 inches long, 1 to 5 mm wide, folded in the bud and lack hairs on either surface. Leaves are "keeled" and have a distinctive boat-shaped tip. The ligule is slightly pointed and membranous. Stems may be either erect or bending and may root at the base of the tillers. The seedhead is an open panicle, 3/4 to 2-1/2 inches long, and pyramidal in outline.
 

IPM1007, revised November 2009

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