Evaluation of Preventative Fungicides for Control of Summer Patch of Poa Caused by Magnaporthe poae

Diseases,

Summary: In a replicated field trial at Arrowhead Country Club, San Bernardino, CA, monthly preventative treatments of Heritage at 0.2 and 0.4 oz/1000 sq ft and Lynx at 1.5 oz/1000 sq ft provided good to excellent control of summer patch compared to monthly applications of Bayleton at 4.0 oz/1000 sq ft or the non-treated control plots. Heritage and Lynx also provided significantly improved turfgrass quality compared to the Bayleton and non-treated plots, although Lynx applications did result in significant, but reversible damage to turf. Bayleton turfgrass quality and control ratings were not significantly higher than the non-treated control plots on many of the rating dates. Based upon these results, Heritage or Lynx would be good replacements for the commercial standard Bayleton.  Due to their solid performance, as well as their high residual activity, the use of Heritage or Lynx should also result in fewer pesticide applications per season for control of summer patch.

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

Cooperator:  John Harkness, Arrowhead Country Club

Sponsors:  Gary Braness, Bayer and David Ross, Zeneca