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Please note that Dr. Frank has written another helpful article available from the MSU Extension web site.
Dr. Kevin Frank has posted a useful article at the MSU Extension website. Please note it is written specifically for Michigan but may apply to other midwest regions.
"Growing degree-days have accumulated quickly, but it may not yet be time to apply plant growth regulators to control annual bluegrass seedheads on golf courses.
All air temperature data has been accounted for now.