Revised June 2007
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Contents
Summer annual broadleaf
Biennial broadleaf
Perennial broadleaf
Summer annual grass
Winter annual grass
Perennial grass
Plants resembling grasses
Herbicides
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Practical Weed Science for the Field Scout: Corn and Soybean
Summer annual broadleaf
A stout summer annual that may reach as much as 9 feet in height with large yellow flowers. Seedlings have cotyledons that are relatively large and oval in outline. First true leaves are lanceolate with toothed margins. Mature plants have leaves that are alternate, rough and hairy, with toothed margins. Lower leaves occur on long petioles. Flower heads are robust and can range from 1 to 5 inches in diameter. Many outer yellow petals enclose the reddish brown disk flowers inside.
IPM1007, revised June 2007