In northern or transitional climates, annual bluegrass (Poa annua) often exist on putting greens as the predominate species or coexist with creeping bentgrass. Whatever the case may be, when seedheads exist, the playing surface is disrupted and the turf quality is compromised. When applied prior to seedhead emergence, Plant Growth Regulators (PGR’s) can effectively suppress annual bluegrass seedheads. PGR’s such as mefluidide (Embark®), and combinations of trinexapac-ethyl (PrimoMAXX®) and ethephon (Proxy®) are commonly used by golf course superintendents to suppress seedheads and promote a higher quality of turf for the playing surface.
Commonly used Embark® T/O is currently in limited quantity and is no longer being produced at this time; therefore, more emphasis is on PrimoMAXX®/Proxy® applications to suppress annual bluegrass seedheads. Research has been conducted at Penn State University by Dr. Borger showing an improvement in seedhead suppression with Primo®/Proxy® when Macro-Sorb Foliar has been added to the tank mix.
Macro-Sorb Technologies recommends adding Foliar to your seedhead suppression applications at 2.0 – 4.0 fl oz. per 1000 sq. ft. In the research conducted by Dr. Borger (below), adding 4.0 oz of Macro-Sorb® Foliar to PrimoMAXX® (5.0 fl oz./A) + Proxy® (5.0 fl oz./M) improved seedhead suppression by 12.5%. In addition to improved seedhead suppression, Macro-Sorb® Foliar will enhance photosynthetic activity and increase root length. For more information about Macro-Sorb Foliar click here.
PimoMAXX, Proxy and Embark are registered trademarks of Syngenta, Bayer, and PBI/Gordon