Golf Course Management

FEB 2014

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02.14 GOLF COURSE MANAGEMENT 95 C mical treatments The herbicide Turfon Ester is labeled for use for overseed preparation of bermuda- grass, as are desiccants Scythe and Reward. The nonselective herbicide Finale will pro - duce necrotic straw, but has no effect on stolons or rhizomes and therefore was in - vestigated as a potential candidate for use. Chemical applications were made fve days before the overseeding mechanical treat - ments, which occurred during the seashore paspalum's elongation period. Cultural treatments The perennial ryegrass cultivar Two Streams was seeded at a rate of 625 pounds pure live seed/acre (700.53 kilograms/hect - are). Seeding was followed by hand brooming the plots in two directions, and a single pass with an 875-pound (396.89-kilogram) me - chanical (Brouwer) turf roller (32-inch wide × 28-inch tall [81.28 × 71.12 centimeters]). All turf plots were irrigated for emergence and then mowed to 0.625 inch when the ma - jority of the plots were 0.875 inch tall. Af- terward, the plots were mowed three times weekly at 0.625 inch throughout the test. Fer - tility was 0.25 pound nitrogen/1,000 square feet (1.22 grams/square meter) per month from a 15-15-15 complete water-soluble fer - tilizer source. Each January the turf received Sequestrene 138 chelated iron, applied at 3 ounces product/1,000 square feet (0.92 gram/ square meter) in a solution delivery volume of 57 gallons/acre (533.17 liters/hectare). Data collection and analysis The turf was rated for percent plot over- seeding (perennial ryegrass) cover, percent plot straw when applicable on a 1%-100% scale. Plots were also rated for turfgrass color, density and overall turfgrass quality using the NTEP visual assessment scale (1-9, where 1 is dead turf and 9 is the best possible). The test was conducted in three successive years, (2009-2010, 2010-2011, 2011-2012) with the same treatments appearing on the same plots. The treatments were analyzed as the specifc combinations of preparatory mow - ing heights, vertical mowing and chemical amendment additions (n = 42 treatments). Data are presented for overall turfgrass qual - ity, which includes the visual integration of density, smoothness and uniformity of color. Turfgrass quality results are provided as an Product/ company name Chemical name Formulation Amount of product applied Amount of active ingredient applied Reward/Syngenta diquat (37%) 2 pounds/gallon 1 quart/acre 0.25 pound ai/acre Finale/Bayer glufosinate (11%) 1 pound/gallon 1 gallon/acre 1 pound ai/acre Turflon Ester/ Dow AgroSciences trichlopyr (60%) 4 pounds/gallon 10 fluid ounces/acre 0.31 pound ai/acre Scythe/ Dow AgroSciences pelargonic acid (57%) 4.2 pounds/ gallon 5% v/v at 125 gallons/acre 26 pounds ai/acre Note. Application dates were: Year 1 − Oct. 31, 2009; Year 2 − Oct. 21, 2010; Year 3: − Oct. 27, 2011. Table 1. Herbicides selected for use as canopy treatments on seashore paspalum as part of the fairway overseeding preparation process. GROUP 1: Best treatments Treatment no. Mowing height (inches) † Verticut ‡ Chemical treatment (herbicide) 3 0.375 yes none 19 0.375 yes Reward 23 0.375 yes Scythe 27 0.375 yes Finale 31 0.375 yes Turflon Ester 28 0.625 yes Finale 33 0 yes Reward 29 0.375 no Turflon Ester 17 0.375 no Diquat 36 0 no Turflon Ester GROUP 2: Non-chemical (mechanical) treatments only 11 0 yes none 9 (control) 0 no none 3 0.375 yes none 1 0.375 no none 7 0.625 yes none 5 0.625 no none GROUP 3: Chemical treatments only 33 0 no Reward 34 0 no Scythe 35 0 no Finale 36 0 no Turflon Ester † Mowing preparation. 0 = clipped at frst ryegrass mowing; 0.375 = mowed to 0.375 inch at day of overseeding; 0.625 inch = mowed to 0.625 inch at day of overseeding. ‡ Verticut: Treatments are either not verticut, or received two passes at 0.75-inch bench height. Table 2. Treatments discussed in this paper are the best treatments (Group 1) as well as other treatments discussed for comparison purposes. Herbicides for overseeding preparation Treatments discussed 094-105_Feb14_TechwellCuttingEdge.indd 95 1/17/14 11:48 AM

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