Efficacy of herbicides for Poa control on overseeded fairways

September 2, 1999

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.

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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