Revised June 2007

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Contents

• Principles of weed identification
• Weed scouting and mapping procedures
• Economic thresholds for weeds
• Herbicide injury
• Factors contributing to herbicide injury

Weed identification

Herbicides

• Herbicide mode of action families
• Growth regulators
• Amino acid synthesis inhibitors
• Lipid synthesis inhibitors
• Seedling growth inhibitors
• Photosynthesis inhibitors
• Cell membrane disruptors
• Pigment inhibitors

Related pages

• G1886, Controlling Drift of Crop Protection Materials
• IPM1021, Vine Weeds of Missouri
• IPM1023, Missouri Weed Seeds

Other related Web sites

• MU Extension Plant Diagnostic Clinic
• WeedSOFT™ yield loss calculator

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Practical Weed Science for the Field Scout: Corn and Soybean

Summer annual broadleaf

Morningglory, palmleaf (Ipomoea wrightii)

A trailing or climbing annual vine with lobed leaves and pink to light purple flowers that range from 3/4 to 1 inch in length. Palmleaf morningglory is primarily a weed of agronomic crops found in the southeastern United States. Seedlings have cotyledons that are deeply indented, have pointed ends and are without hairs. The cotyledons of palmleaf morningglory closely resemble those of pitted morningglory. Mature plants have leaves that are distinctly lobed into three to seven segments, giving the overall appearance of fingers on a hand. Individual segments range from 3/4 to 2-1/2 inches long. All lobes arise from the same point.

IPM1007, revised June 2007