Golf Course Management

APR 2014

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

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04.14 GOLF COURSE MANAGEMENT 93 Disease development In 2009 we measured patch diameters for several weeks at all three locations. At all three sites, there was no effect of cultivation or timing of fertilization on patch size or the rate of patch expansion. Data from Haysville are presented in Figure 1. The other sites were similar. In 2010 and 2011, we used only digital image analysis. The patches had become larger and had coalesced, making individual patch size measurements diffcult. There was no effect of cultivation on disease at any site in 2010 or 2011. However, there were some signifcant effects of fertility in those years. In fall 2010 in Manhattan, the spring + fall fertility treatment had signifcantly less non-green turf than the summer fertility treatment (Table 2). Similarly, in Haysville, the spring + fall fertility treatment had less non-green turf than did the summer fertil - ization treatment on June 22, but this effect was not signifcant on July 7. In Haysville in spring 2011, the spring/fall fertility treatment again had less non-green turf than the sum - mer fertility treatment (Table 2). In spring 2011 in Manhattan, there was a signifcant interaction among cultivation and fertility treatments. The cultivated spring + fall fer - tilization treatment had less non-green turf than both summer fertility treatments, and the noncultivated spring + fall fertilization treatment had less non-green turf than the noncultivated summer treatment (Table 2). There were no differences at the Olathe site in 2010 or 2011 (data not shown). Discussion This study was conducted over several years to examine the potential impact of the cultural practices over time. Cultivation did not affect disease based on patch size, patch size increase or digital image analysis, and it did not affect volumetric soil content or tem - perature. We hypothesized that cultivation might improve drainage and therefore reduce disease pressure, but this did not occur. We were not able to measure moisture right at the thatch or on the leaf sheaths, which may be a more informative area because that is where the pathogen infects the plant. However, in - strumentation to measure moisture in those areas was lacking. Fertilization in spring and fall was associ - ated with slightly lower percentages of non- green turf at Manhattan and Haysville, but The cultural practices and fertility regimes were initiated in summer 2008 and continued through 2011. Cultivation practices included core-aerifcation, verticutting and sand topdressing. Cultivated, summer Noncultivated, spring + fall Noncultivated, summer Cultivated, spring + fall Patch diameter (inches) May 19 May 26 June 2 June 9 June 15 June 25 Figure 1. Effect of cultivation and timing of nitrogen fertilization on large patch severity as assessed by patch sizes in 2009 in Haysville, Kan. Results in Manhattan and Olathe were similar. There were no signifcant differences among treat - ments for patch size or rate of patch expansion at any site in 2009. Cultivation and fertilization timing vs. large patch severity 090-101_April14_TechwellCuttingEdge.indd 93 3/18/14 2:54 PM

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