SportsTurf provides current, practical and technical content on issues relevant to sports turf managers, including facilities managers. Most readers are athletic field managers from the professional level through parks and recreation, universities.
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FIELD SCIENCE 10 SportsTurf | October 2015 www.sportsturfonline.com General application overview. Product application rates are listed on the labels for specific grasses and use sites. Many factors, such as temperature, moisture, light and fertility, con- trol turfgrass growth rates, so product labels contain a range of application rates. Lower labeled rates applied on a more frequent basis, such as every 2-3 weeks, generally provide the best results in terms of consistent growth suppression. Because Primo Maxx is foliar absorbed, be sure to apply it with enough water for uniform coverage (a minimum of 44 gallons per acre) and let the foliage dry for at least 1 hour before any irrigation is applied. Rates for overseeding applications are higher since maximum suppression is needed and temporary reduction in turf quality can be tolerated. Conversely, Trimmit should be watered in after application (or at least within several hours). Trimmit is primarily absorbed through the roots, but some foliar and stem absorption does occur. Because movement in the plant is upward, foliar-absorbed Trimmit moves to the leaf tips, which are not areas of high GA production, especially in older leaves. ■ ST SUMMARY OF PGR USES ON SPORTS FIELDS: Reduction in Clippings Less green waste, mowing time reduced, labor savings Primo Maxx is labeled for mixing with turf paint Painted lines and logos will last longer Density increase, increased root growth, better turf quality Better wear tolerance and recover Pre-stress conditioning Primo Maxx applications prior to heavy use periods or special events enhances recovery Increase resistance to abiotic stresses Maintain better turf quality with reduced water, increased shade and under abnormal weather patterns Poa annua control Trimmit can reduce Poa populations in cool-season turfgrasses Overseeding enhancement Establish overseeding faster with Primo Maxx Table 1. Growth Regulation Modes of Action Class A: Late GA Synthesis Blockers Primo Maxx® (trinexapac-ethyl), Anuew™ (prohexadione-CA) Class B: Early GA Synthesis Blockers Trimmit® (paclobutrazol), Cutless® (flurprimidol) Class C: Mitotic Inhibitors Slo-Gro® (maleic hydrazide), Embark® (mefluidide), Atrimmec® (dikegulac-sodium) Class D: Herbicidal Mode Glyphosate, ACCase, ALS inhibitors Class E: Ethylene Production Enhancement Proxy® (ethephon) Chart 1. Scanning Electron Microscopy Cell Length (adaxial surface) Syngenta Research – Jealott's Hill Site UNTREATED PRIMO MAXX