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Practical Weed Science for the Field Scout: Corn and Soybean
Horseweed or Marestail (Conyza canadensis)
Summer annual broadleaf
An erect winter or summer annual that may reach as much as 6-1/2 feet in height. Seedlings have cotyledons that are small and oval, first true leaves are egg shaped with toothed margins, becoming hairy with age. Mature plants have leaves that are entirely without petioles, hairy, alternate, linear and usually toothed. Leaves become progressively smaller up the stem. Small white flower heads occur at the top of the central stem. Many small white bristles are attached to the achene, which facilitates aerial dispersal of the seed.
IPM1007, revised November 2009
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