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    Farming & Crop Protection Prostrate knotweed

    Prostate knotweed

    Summer annual seed-propagated weed germinating in spring and summer with deep root. Undemanding, found on all soils, especially on loamy and sandy soils. Grows poorly only in waterlogged soils.

    overview

    Prostrate knotweed - image 1

    Prostrate knotweed - image 1

    Prostrate knotweed - image 2

    Prostrate knotweed - image 3

    Pest Profile

    • About the pest

      Description

      Cotyledons are very long and narrow (10-15 mm long, 1-2 mm wide), blunt-tipped,without stems (Petioles) (Picture 1). True leaves are elliptical, small, slightly rotated, yellow-green and very short-petioles (Picture 2). Ligules are tube-like, split-leaved during fruiting times. The flowers are pink to white standing in axils in groups of 2-3. The plant forms 150-200 ovate to elliptical, dark-brown seeds which are flattened on three sides (Picture 3). In soil, the seeds remain viable for a long time (over 50 years). The optimal germination temperature is 2-5 °C.

      Symptoms & Diagnosis

      Occurence

      Spring cereals, beets, maize, legumes, potato.