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Book: Proceedings of the Second International Turfgrass Research Conference
Published by: American Society of Agronomy, Crop Science Society of America



  1.  p. 62-73
    Proceedings of the Second International Turfgrass Research Conference

    Eliot C. Roberts (ed.)

    ISBN: 978-0-89118-573-4


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Registration and evaluation of turfgrasses in the Netherlands1

  1. R. Duyvendak and
  2. H. Vos


The Dutch Seeds and Planting Materials Act provides legal provisions regarding the Dutch register of varieties, breeders rights, the list of varieties, and marketing of seeds and certification. In 1972 the act was adjusted to the Directives of the European Economic Community. To be included in the register of varieties, a seed sample and a short description of the grass variety must be provided. The seed, which is tested by an official institution, is judged by the registration criteria: distinctness, homogeneity and stability, and on application for breeders right at world novelty. The testing is concluded with a distinguishing varietal description stating morphologic characteristics. Besides the register of varieties there is a varieties list which is issued each year. A national authority chooses and describes those varieties judged to be of agriculture value and importance for the Netherlands.

Registration examination of sufficient distinctness and homogeneity of the varieties is explained in more detail for Kentucky bluegrass (Poa pratensis L.) and red fescue (Festuca rubra L.). Before 1973 about 40 varieties of Kentucky bluegrass were distinguished with respect to: presence of anthocyanin in leaf sheath and panicle, presence of hairs on different parts of leaf sheath, leaf blade and ligule, dimensions of culm and leaves, shape of the panicle, heading date, resistance to different diseases. The chromosome number is not used. About 30 varieties of red fescue have been distinguished with respect to: chromosome number, growth habit, rhizome development, presence of anthocyanin in leaf sheath, dimensions of culm and leaves, heading date, resistance to diseases.

For the testing on cultural value chiefly other characteristics are taken into account such as: persistence, competitive ability, color in winter and summer, resistance to diseases, frost and treading, rapidity of establishment and growth, and leaf blade width. The testing is executed under the same conditions as those under which the varieties are used in practice, or with methods which give comparable results. The best varieties are described in the varieties list issued yearly. Additional index words: Breeders rights, Turf-grass registration, Distinctness, Homogenity, Stability, Morphological characteristics, Poa pratensis L., Festuca rubra L.

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Copyright © 1974. Copyright 1974 by the American Society of Agronomy, Inc. and the Crop Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA