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 91 verity on zoysiagrass. They found that lower mowing heights resulted in more severe dis - ease. In addition, large patch was not affected by nitrogen source (urea, urea formaldehyde, poultry litter, sewage sludge or bovine waste) or the two different application rates of 1.5 or 3.0 pounds nitrogen/1,000 square feet (7.32 or 14.64 grams/square meter) per year. The authors did not, however, study the ef - fect of different fertilization timings such as early spring or late fall applications that may be used to prolong the length of season when the turf is green. Cultivation leads to improved soil mois - ture and oxygen conditions, resulting in improved root growth as well as increased microbial activity that is essential to the bio - degradation of thatch. Aerating zoysiagrass turf in early spring when large patch is ac - tive has been anecdotally reported to result in new satellite infections on healthy turf by infected cores. The effects of cultivation in summer are not known, however. In ad - dition, the effect of timing of nitrogen fer- tilization and cultivation on large patch de- velopment and severity in zoysiagrass is not known, although turfgrass managers have associated severe large patch outbreaks with excessive nitrogen fertilization. The goal of this study was to evaluate the effect of cultivation on soil moisture, soil and thatch temperatures, and large patch develop - ment as well as evaluate the effect of timing of fertilization on large patch development. Methods The experiment was conducted at three Kansas locations: the Rocky Ford Turfgrass Research Center in Manhattan, the K-State Research and Extension Center for Horticul - tural Crops in Olathe, and the John C. Pair Horticulture Center in Haysville. Inoculation The plots were inoculated on Sept. 25, 2008, in Manhattan, Oct. 2 in Olathe and Oct. 3 in Haysville. The R izoctonia solani pathogen was grown on one-quarter-strength potato dextrose agar + antibiotics in the labo - ratory, transferred to glass jars of sterile oats and allowed to grow for two weeks before use. To inoculate the plots, a slice was made in the thatch and 8-10 grams of oats were in - serted in each spot. The turf slice was tamped back down and the area was irrigated to pro - mote fungal growth. Thermocouples and The Rhizoctonia solani pathogen was grown in the laboratory and then transferred to glass jars of sterile oats, where it was allowed to grow for two weeks before use. Research plots were inoculated by making a slice in the thatch and inserting 8-10 grams of oats in each spot. The turf slice was tamped back down and the area was irrigated to promote fungal growth. 090-101_April14_TechwellCuttingEdge.indd 91 3/18/14 2:54 PM

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