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IPM1007, Practical Weed Science for the Field Scout: Corn and Soybean

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Practical Weed Science for the Field Scout: Corn and Soybean

Pennycress, field (Thlaspi arvense)

Winter annual broadleaf

Pennycress, fieldPennycress, field
Pennycress, fieldA winter annual weed of small grains, nurseries and horticultural crops throughout the United States. Seedlings have cotyledons that are oval to oblong in outline and occur on long (5–7 mm) petioles. Leaves that initially develop into a basal rosette are without hairs and are oval in outline, with a wavy margin. Leaves along the flowering stem are generally much different from those of the basal rosette. Stem leaves are more lanceolate in outline, lack petioles, usually have toothed margins, and have pointed lobes that clasp the stem at the base of the leaf. Individual white flowers are very small and occur in clusters at the ends of the “bottle-brush” stems.

 

Wild thing
 

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