Science and Golf II: Proceedings of the 1994 World Scientific Congress of Golf

By A. J. Cochran; M. R. Farrally | Go to book overview

72

Characterization of localised dry spots on creeping bentgrass turf in the United States

T.K. Danneberger and R.A. Hudson

Department of Agronomy, The Ohio State University, Columbus,
Ohio and Ecogen, Inc., Langhorne, Pennsylvania, USA

Abstract

Localised dry spots (LDS) are a serious problem on creeping bentgrass turfs in the United States. The cause of LDS is not fully understood. Studies were conducted to provide a more complete characterization of LDS and the effect of nitrogen on the severity of LDS. Results obtained showed increased levels of extracted organic matter associated with non-wettable soils than wettable soils. The only structural difference in the extracted organic matter was observed following a methanol extraction of 3-yr-old green. It appears there is either a unique organic structure, or interaction between several structures occurring in LDS areas. Nitrogen applications tended to reduce the severity of LDS.

Keywords: Localised Dry Spots, Turfgrass, Agrostis palustris, Nitrogen


1 Introduction

Localised dry spots (LDS) are irregular shaped turf areas appearing to suffer from drought stress, due to the presence of a water-repellent agent in the soil (York and Baldwin, 1992). Symptoms of LDS appear initially as irregular shaped patches of wilting turf. The turf patches progress to a brownish to tan colored turf. Frog-eye type patches, characteristic of some turfgrass patch diseases, have been observed but do not predominate. Soils underling LDS are lighter in color and lower in moisture content compared to adjacent soil profiles under healthy turf which are darker in color and higher in moisture content. In turf, LDS is primarily associated with high sand content golf greens (Tucker et al., 1990; Hudson and Danneberger, 1992). However, LDS have been observed on soils with

Science and Golf II: Proceedings of the World Scientific Congress of Golf. Edited by A.J. Cochran and M.R. Farrally. Published in 1994 by E & FN Spon, London. ISBN 0 419 18790 1

-477-

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