Cookies help us deliver our services. By using our services, you agree to our use of cookies. Learn more.

    Farming & Crop Protection Persian speedwell

    Persian speedwell

    Annual seed-propagated weed usually germinating in spring, forms many shoots when the soil is supplied with abundant nitrogen. Usually found on humus-rich, nutrient-rich, moist loam soils. Nitrogen remover. Native to the Near East, spread from botanical gardens in the 19th century.

    overview

    Persian speedwell - image 1

    Persian speedwell - image 1

    Persian speedwell - image 2

    Persian speedwell - image 3

    Persian speedwell - image 4

    Pest Profile

    • About the pest

      Description

      Cotyledons are spatulate to triangular, rounded at top, short-stemmed (Picture 1). True leaves are rounded to broadly ovate, almost cordate (heart shaped) at the base, leaf margin is coarsely crenate (notched), with rounded lobules and scattered erect hairs (Picture 2). Inflorescences are borne individually on long pedicels with curly hairs arising from the leaf axils, sky blue with a lower white tip (Picture 3). Seeds are approx. 2 mm long, peltate and strongly transversely rugose on the back (Picture 4). Approx. 50 to 100 seeds are formed per plant. Viable in the soil for 50 years. Germination occurs at 2-5 °C; the optimum temperature is between 15-25 °C.

      Symptoms & Diagnosis

      Occurence

      Winter wheat, beets, oilseed rape, legumes, potatoes.