Sonchus oleraceus (weed)

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Sonchus oleraceus (click on image to enlarge it)
Author(s): Robert Vidéki, Doronicum Kft., Hungary
Source: IPM Images

Sonchus oleraceus (weed) L. - (annual sowthistle)

This plant is native to Europe and western parts of Asia, but now has a world-wide distribution. It is a common weed in many crops, including cereals, vegetables, cotton and grapevine. High densities can result in yield losses of 50% or more (e.g. see Manalil et al., 2020).

Common sowthistle is an annual plant and can grow to a height of up to 1 m. The stems are hollow and the leaves are normally lobed. The flowers are yellow or orange and each plant produces several thousand seeds per year which are attached to a pappus and disperse mainly by wind.

Vernacular names
• Deutsch: Kohl-Gänsedistel
• English: annual sowthistle
common sowthistle
smooth sowthistle
• Français: laiteron commun