Golf Course Management

NOV 2018

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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72 GOLF COURSE MANAGEMENT 11.18 1.5 gallons/1,000 square feet (65 gallons/acre or 61 ml/square meter) on March 10, April 5 and April 20, 2017. Untreated plots in spring in Colorado were covered with tarps at each application. Methods Small-plot research like this uses bottles to mix and apply small product amounts to the small turf areas being treated. e mixing compatibility component of this work was ba - sically a jar test. Label mixing directions were followed for each product used. Plastic soda bottles 1) were filled with a small amount of water; 2) had the proportionate amounts of each product added, and 3) had more water added to bring the solution up to a 33.8-fluid ounce (1-liter) volume level. After thorough mixing, the solution was set aside to stand for 15 minutes. Any product separation, or for - mation of globules, sludge, flakes or other pre- cipitates are signs of incompatibility and were noted. Fungicide + Proxy treatment applications were assessed for phytotoxicity as turf entered (pre-snow timing) and emerged (post-snow timing) from winter dormancy. Turf quality was rated on a 1-9 scale (where 6 is accept - able) at each winter application timing and in spring when seedheads were evaluated. Turf color was also measured on the same days with a chlorophyll meter that estimates the "green - ness" of turf by measuring reflected wave- lengths of light. Seedheads were rated for seven straight weeks from April through May in Utah and on two dates in May in Colorado on a visual scale of 0% to 100% cover. Calculations of seedhead pressure over time were made, and suppression (or control) of seedheads was cal - culated with means relative to pressure in un- treated turf in spring. Mixing compatibility A mixture is physically compatible if the combination remains mixed, or if it can be re - mixed readily. ere were no signs of incom- patibility when Proxy was mixed with either Interface + Mirage or Instrata fungicides in November at the pre-snow timing, or with either Mirage or Banner Maxx fungicides in February at the post-snow timing (Figure 1). All treatment mixtures were sprayed within 20 minutes of mixing, and no clogging oc - curred when the mixture was sprayed through the air-induction nozzles with 50-mesh stain - less steel screens. Seedhead suppression results Annual bluegrass seedheads started emerg- Figure 1. Pre-snow timing treatments of Proxy mixed with Interface + Mirage (shown) and post-snow timing treatments of Proxy mixed with Mirage (not shown) had good physical compatibility, with no signs of separation, globules, sludge, flakes or other precipitates. The mixtures were not agitated for 15 minutes after mixing, then reagitated, and sprayed through AI-11002VS nozzles with 50-mesh stainless steel screens without clogging. Photos by Adam Van Dyke Pre-snow timing treatments Interface 6 fl. oz./1,000 sq. ft. Mirage 2 fl. oz./1,000 sq. ft. Interface 6 fl. oz./1,000 sq. ft. Mirage 2 fl. oz./1,000 sq. ft. Proxy 5 fl. oz./1,000 sq. ft.

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