Golf Course Management

DEC 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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12.18 GOLF COURSE MANAGEMENT 75 CUTTING EDGE Teresa Carson Dazomet for Poa annua control in fairway renovations Sterilizing the soil is a necessary first step in golf course renovations, because the planted seed must be the only seed that will germi nate. Without a soil sterilant, any existing weed seeds may become viable and germinate, competing with the newly planted seeds. Until recently, methyl bromide was the most com monly used sterilant, but it has been removed from the market. One alternative to methyl bromide is dazomet (Basamid, Amvac). We focused on the ability of dazomet to inhibit germination and emergence of annual blue grass (Poa annua), which has an abundant soil seed bank. A primary objective of our research was to develop a procedure that would not re quire covering large areas (like golf fairways) th at were being treated with dazomet. Re search was completed on fairway height creep ing bentgrass/annual bluegrass mixed stands in East Lansing, Mich., where multiple rates of dazomet were used in variable intervals fol lowed by seeding of a new creeping bentgrass stand into the treated area. Our results suggest that, to have significant control, turf growers may need to apply dazomet at a higher rate than the current label permits. (Note: All users should follow label instructions carefully.) ere were no significant negative effects from seeding immediately after treatment because the current label allows for re entry into the treated area. — Jacob S. Bravo; John N. Rogers III, Ph.D. (rogersj@msu.edu); and James R. Crum, Michigan State University, East Lansing, Mich.; and Charles Silcox, Ph.D., Amvac Chemical Corp., New - port Beach, Calif. Mowing height and frequency affect green speed and plant health e objective of this study was to deter mine the effect of mowing frequency and height on ball roll distance. Two 14 day field studies were conducted in 2015 and 2016 at the Joseph Valentine Turfgrass Research Cen ter in University Park, Pa. Each study was conducted on an A 4 creeping bentgrass or annual bluegrass green. Plots measured 4 × 9 feet (1.2 × 2.7 meters), and height of cut for mowers was 0.085 (2.1 mm), 0.100 (2.5 mm) and 0.115 inch (2.9 mm). Plots were mowed once, twice, or four times per day. Single cut and double cut treatments took place in the morning, and double double cut treatments consisted of double cutting in the morning and again in the afternoon (four times/day). Ball roll distance, color and quality were as sessed daily. Height of cut and frequency had significant effects on all rating dates. Plots mowed at 0.085 inch had greater ball roll dis tance than plots mowed at 0.115 inch on 100% of rating dates, and plots mowed at 0.100 inch had greater ball roll distance on 86% of rat ing dates. Double double cut plots had greater ball roll distance on 93% of rating dates when compared to double cut plots and on 100% of rating dates when compared to single cut plots. On creeping bentgrass, height of cut and frequency had significant effects on ball roll distance on all rating dates. When com pared to plots mowed at 0.115 inch, ball roll distance was greater for plots mowed at 0.085 inch on all rating dates and for plots mowed at 0.100 inch on 93% of rating dates. Mowing plots four times per day resulted in greater ball roll distance than double cutting on 93% of rating dates and greater than single cutting on all rating dates. For both experiments, color and quality were reduced during the trial as height of cut was reduced and frequency was increased. — Timothy Lulis and John Kaminski, Ph.D. (kaminski@psu.edu), Penn State University, University Park, Pa. Teresa Carson (tcarson@gcsaa.org) is GCM 's science editor. Photo by Timothy Lulis Photo by Jacob Bravo

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