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    Farming & Crop Protection Curlytop knotweed

    Curlytop knotweed [Polygonum lapathifolium]

    Annual highly variable seed weed germinating from the spring to summer. Predominantly found on well-ventilated, moist, nutrient-rich, loam and sandy soils.



    Curlytop knotweed - image 1

    Curlytop knotweed - image 1

    Curlytop knotweed - image 2

    Curlytop knotweed - image 3

    Curlytop knotweed - image 4

    Pest Profile

    • About the pest


      Cotyledons are lanceolate (spear-shaped), short-stemmed with reddishstem (Picture 1). Leaves are alternate, elliptical to lanceolate in shape, narrower towards the stalk (Picture 2). Underside punctured with warty glands, upper side almost hairless. Frequently has a dark spot on the leaf (Picture 3). The ligules loosely clinging to the petiole are generally hairless or have only very short cilia. The inflorescences are small, greenish-white to pale-pink with cylindrical pseudo-spikes (Picture 4). The approx. 800 seeds are lenticular, glossy black-brown and viable for more than 10 years in the soil. Germination starts from 2-10 °C . The optimum temperature is between 30-40 °C.

      Symptoms & Diagnosis


      Spring wheat, beets, spring rape, maize, legumes, potatoes.