Tag: plant growth regulators

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Reflections on managing annual bluegrass

May 13, 2026 By Mike Kenna, Ph.D.

A recap of new research on why annual bluegrass is so persistent, and why managing Poa annua takes a systems-based, long-term approach. ...

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The normalized relative clipping yield of annual bluegrass putting green turf in Corvallis, Ore., averaged across June, July and August treatments during 2023 and 2024, after a single application of Primo (left) or Anuew (right) combined with weekly applications of nitrogen at low N (top) or high N (bottom). Equation and R² values are from the sine wave model used to calculate relative growth suppression. The vertical line indicates the reapplication interval. (Figure: Golfdom staff)

Super Science: A recap of the research published in 2025

January 14, 2026 By Mike Kenna, Ph.D.

A summary of the research information provided by turfgrass researchers and the USGA Green Section that appeared in Golfdom this year. ...

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The Turf Doc: A case of ‘What’s that?’

January 8, 2026 By Karl Danneberger, Ph.D.

Two abnormalities that occur that trigger a response like “What’s that?” are annual bluegrass etiolation — or mad tiller disease — and white leaf. ...

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Photo 1. Penncross creeping bentgrass (outlined in blue) shows discoloration in response to lower nitrogen rates in evaluating 10 creeping bentgrass cultivars. (Photo by: Ohio State University)

New USGA research evaluating plant growth regulators

October 13, 2025 By Mike Kenna, Ph.D.

USGA-supported research at Ohio State and Rutgers is uncovering how plant growth regulators shape the performance of new creeping bentgrass cultivars. ...

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