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    Field sowthistle [Sonchus arvensis]

    Spring-germinating, annual seed-propagated weed or perennial root-propagated weed. Reproduces chiefly through root or rhizome parts, seeds are wind dispersed over long distances. Plant parts contain milky latex. Likes fresh to moist, nitrogen-rich, humus-rich, deep loam or clay soils. It is generally indicative of underground moisture.


    Field sowthistle - image 1

    Field sowthistle - image 1

    Field sowthistle - image 2

    Field sowthistle - image 3

    Field sowthistle - image 4

    Pest Profile

    • About the pest


      Cotyledons have short stems, obovate, margins entire (Picture 1). In the weeds germinating from seed, the first true leaves are round-cordate, with rounded auricles (Picture 2). The later true leaves are shiny green, sinuate-pinnatifid, margins bristly-prickly serrated. The golden yellow flower heads are borne in terminal cymes (Picture 3). As many as 20,000 seeds can be produced per plant (Picture 4).

      Symptoms & Diagnosis


      Grain, maize, in isolated cases beets