PACE Turf - Turfgrass Information Center

Research Guide

New products, new ideas, new pests and problems and new controversies abound in the world of turfgrass management. Combined with the currently registered pesticides, fertilizers, amendments, and various new pieces of cultivation equipment and turfgrass management approaches, the task of selecting the correct blend of products and practices can sometimes be daunting. The only way to gain more confidence that a management system is the best one for your site is to start a testing program at your golf course, as outlined in this guide. Part I of this Research Guide, "Getting Started", will describe the basic elements of testing program, attitude, components of an experiment, record keeping; Part II, "Experiment Design", will provide expanded details on how to set up experiments that will be simple and efficient, plot design, replication and randomization techniques will be discused; Part III, "Interpreting Results", will provide a background on how to evaluate your findings and how to decipher scientific publications with an introduction to basic statistics.

Printable version of full report (305 kb pdf)

Efficacy of herbicides for Poa control on overseeded fairways

Summary: In replicated field trials conducted on common bermudagrass fairways that were overseeded with perennial ryegrass, rates and timing of various herbicides were evaluated for Poa annua control efficacy. Key results include:

  • Pre-emergence herbicides such as Dimension and Barricade continue to be most effective when applied prior to overseeding, as opposed to after overseeding.
  • Applications made post-overseeding required higher rates of Dimension (200 lbs/A of the 0.25G formulation) to achieve the same efficacy observed at lower rates (150 lb/A) applied before overseeding.
  • The efficacy and longevity of split applications was evaluated, but was difficult to assess, due to low populations of Poa annua.
  • None of the treatments tested caused damage to either ryegrass or bermudagrass.

Printable version of full report

Principal Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPPP, CPAg Cooperators: Nancy Dickens, Mountain Vista Golf Course Sponsor: Rohm and Haas

Effect of Primo on overseeding

As detailed in the Super Journal report, "Evaluation of Primo rates and application: timing strategies for improved transition and turf quality on common bermudagrass fairways" (476 KB pdf document), trinexepac-ethyl can have both positive and negative effects on turfgrass quality. Key findings included:

  • Of the 41 treatments tested (4 rates, 5 timing strategies and single vs. double applications), we found that Primo treatments made at the time of the first ryegrass mowing (on October 23, 1996, or 1 day after the first mowing) resulted in an improved Fall transition from bermudagrass to ryegrass and significantly higher quality ryegrass during the critical winter and spring months than other treatments tested.
  • The most economical of the highest ranked treatments was a single application of Primo Liquid at 0.5 oz/1000 sq feet, applied on 10/23/96.
  • In contrast, Primo applications made later in the Fall (October 30, 1996, or 8 days after the first mow), produced a negative effect on turf quality during the 1997 Spring transition.
  • These results confirm that the currently labeled rate of 0.5 oz/1000 square feet for use of Primo Liquid in overseeding programs is the optimal rate for use in overseeding programs in the Low Desert, but that the currently recommended application timing (1 - 5 days before overseeding) may need to be adjusted. To confirm the results of this study, a 1997/98 trial that re-tests the highest ranked treatments from this year's study is recommended for initiation in September, 1997.

Project title: CEvaluation of Primo rates and application: timing strategies for improved transition and turf quality on common bermudagrass fairways

Principal investigators: Wendy Gelernter, Ph.D. and Larry Stowell, Ph.D., CPAg, PACE Turfgrass Research Institute

Cooperators: Tom Baty, Indian Wells Country Club

Sponsors: Hi Lo Desert GCSA and Novartis


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