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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. 390-398
    Proceedings of the Second International Turfgrass Research Conference

    Eliot C. Roberts (ed.)

    ISBN: 978-0-89118-573-4


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Tillering response of Kentucky bluegrass and annual bluegrass to TIBA1

  1. B.A. Rieger and
  2. J. L. Eggens


Application of suitable growth regulators may help to extend the vegetative phase of annual bluegrass (Poa annua L.) and at the same time reduce its seed production without damaging the other more valuable components of the turf. The response of Kentucky bluegrass (Poa pratensis L.) and annual bluegrass to the auxin transport inhibitor, 2,3,5-triiodobenzoic acid (Regim—8, TIBA) in greenhouse monocultures was investigated.

The chemical was applied to both speices in 10, 100, and 1,000 ppm active ingredient (ai) concentration once at three dates. Plants sprayed between 5 and 8 weeks after seeding with the highest concentration produced significantly more tillers in both Kentucky bluegrass and annual bluegrass. In annual bluegrass there was also a significant decrease in leaf width and in CO2 released, while no significant differences were found in the dry weight of any of the eight, weekly clippings.

The highest concentration of solution sprayed at the latest date seemed to be most effective in reducing the leaf width and increasing CO2 production as well as causing other visible phenological changes such as foliage color and density, upright versus procumbent growth type, and decrease of seed stalk number. Additional index words: Regim—8, Growth regulator, Poa annua L., Poa pratensis 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