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This article in CS

  1. Vol. 52 No. 3, p. 1406-1415
     
    Received: Jan 8, 2011
    Published: May, 2012


    * Corresponding author(s): john.inguagiato@uconn.edu
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doi:10.2135/cropsci2011.01.0010

Sand Topdressing Rate and Interval Effects on Anthracnose Severity of an Annual Bluegrass Putting Green

  1. John C. Inguagiato *a,
  2. James A. Murphyb and
  3. Bruce B. Clarkeb
  1. a Dep. of Plant Science and Landscape Architecture, Univ. of Connecticut, 1376 Storrs Rd., Storrs, CT 06269
    b Dep. of Plant Biology and Pathology, Rutgers Univ., 59 Dudley Rd., New Brunswick, NJ 08901. New Jersey Agricultural Experiment Station Publication No. D-12294-03-09

Abstract

Sand topdressing has been reputed to increase anthracnose caused by Colletotrichum cereale Manns sensu lato Crouch, Clarke, and Hillman on annual bluegrass (ABG) [Poa annua L. forma reptans (Hausskn.) T. Koyama] putting greens. Field trials were conducted to determine the effects of (i) frequent (7 d) and low-rate (0.3 L m−2) sand topdressing and brushing, (ii) infrequent (21 and 42 d) and increased-rate (1.2 L m−2) sand topdressing, and (iii) sand topdressing application intervals (7, 14, and 28 d) and rates (0.3 and 0.6 L m−2) on anthracnose severity of ABG turf mowed at 3.2 mm. Topdressing every 7 d at 0.3 L m−2 initially enhanced disease (8%) during the first year of the trial; however, continued topdressing reduced anthracnose severity 17 to 47% later in 2006 and 3 to 26% in 2007 compared to nontopdressed turf. Topdressing every 21 and 42 d at 1.2 L m−2 reduced disease 4 to 28% over the 2-yr study; however, sand applied every 21 d reduced disease 5 to 13% more than the 42-d interval in 2007. Topdressing rate (0, 0.3, and 0.6 L m−2) and interval (7, 14, and 28 d) interacted to affect anthracnose severity in both years. Disease declined in a curvilinear manner as rate increased at the 7- and 14-d intervals each year. Increased rates applied every 28 d reduced disease linearly in 2006 and curvilinearly at rates exceeding 0.3 L m−2 in 2007. Topdressing every 7 or 14 d at 0.3 or 0.6 L m−2, respectively, provided the most rapid and effective anthracnose reduction and best turf quality.

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