PACE Turf - Turfgrass Information Center

First report of bermudagrass as a host for rapid blight

Summary: Rapid blight, a newly characterized disease of cool season turfgrass, can be problematic in the same locations for several years, even when fungicide applications are routinely made for its control. It is not known, however, how or where the pathogen survives. Samples taken from Arizona golf courses that overseed indicate that many other grasses, including warm season turfgrasses, are hosts for the rapid blight pathogen, Labyrinthula terrestris. In this study, we found that L. terrestris does indeed “over-summer” in the roots and stolons of bermudagrass, even in locations that have not been overseeded in several years, and even in locations that are regularly treated with fungicides targeted at controlling rapid blight. This suggests that bermudagrass serves as a large, symptomless reservoir of rapid blight inoculum, an observation that helps explain why rapid blight is such a perpetual threat in overseeded turfgrass systems.

Full print version of report (108Kb)

Investigators: Mary W. Olsen and Michele J. Kohout, University of Arizona, Department of Plant Sciences

PACE Members Featured in Rapid Blight Article

PACE Members Featured in Rapid Blight Article: July, 2005

We are proud to announce that this month’s feature story on the American Phytopathological Society’s web page Rapid blight: a new plant disease. The article, a collaborative effort among researchers from PACE, Clemson University and the University of Arizona, highlights the progress made over the past 10 years in identifying this extremely interesting new pathogen, and in developing management plans for its control. Also highlighted is the critical role that superintendents played in the discovery of the disease and in the evolution of strategies for its management.

Superintendents highlighted in the article include:

  • David Zahrte, Santa Ana Country Club, California
  • Kurt Desiderio, Saticoy Country Club, California
  • Mick Twito, Estrella Mountain Ranch Golf Club, Arizona
  • Tommy Witt, when he was at Cassique Golf Course, South Carolinia

Management of Summer Decline with Aliette combinations

Summary: In a replicated field trial at La Jolla Country Club, La Jolla, CA , bi-weekly applications of Aliette Signature combined with either Chipco 26 GT, Chipco Triton or Daconil Ultrex resulted in 100% control of dollar spot (Sclerotinia homeocarpa), with no significant differences observed among the different combinations. As was found in a similar study conducted in 1997, the presence of fairly high dollar spot pressure throughout the trial allowed the evaluation of the role of the treatments tested in reducing the disease component of summer stress complex. However, it was not possible to evaluate efficacy on the other, less tangible factors that can contribute to this phenomenon.

Printable version of full report

Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPPP, CPAg

Cooperator: Bruce Duenow, La Jolla Country Club

Sponsor: Chris Olsen, Rhone Poulenc

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