Full TGIF Record # 225898
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Author(s):Hoyland, B. F.; Landschoot, P. J.
Author Affiliation:Hoyland: Research Technologist, Agronomy; Landschoot: Assistant Professor, Turfgrass Science
Title:Effect of various nitrogen sources on necrotic ring spot development
Section:1991 results: Disease control in turfgrass
Other records with the "1991 results: Disease control in turfgrass" Section
Source:Turfgrass Research Results 1990/1991 [Penn State]. 1991, p. 102.
# of Pages:1
Publishing Information:[University Park, Pennsylvania]: [Pennsylvania State University, College of Agriculture, Agronomy Dept., Entomology Dept., Horticulture Dept., Plant Pathology Dept.]
Abstract/Contents:"The purpose of this study was to determine the effects of selected nitrogen (N) sources on development of necrotic ringspot disease. The trial was conducted over a two year period (1990 and 1991) at the Landscape Management Research Center, University Park, PA. In 1989, a uniform infestation of necrotic ringspot occurred on a five year old stand of 'Touchdown' Kentucky bluegrass. Several isolates of Leptosphaeria korrae were obtained from the site and identity confirmed by examination of teleomorph characteristics. Fertilizer treatments were arranged in a randomized complete block design with four replications. Plot size was 5 ft by 10 ft. Fertilizers were applied by hand using jars with perforated lids at rates to supply an equivalent of 1 lb N/1000 sq ft. A total of 4 lb N/1000 sq ft was applied each year. Dates of fertilizer applications were 10 May, 23 June, 1 September, and 20 October, 1990 and 29 April, 7 June, 28 August, and 10 October, 1991. The turf was mowed at 1.75 inches. The preemergence herbicide pendimethalin and postemergence herbicides, 2,4-D, MCPP, and dicamba were applied in 1990 and 1991 to control weeds. Necrotic ring spot severity was visually rated on 1 June and 6 September 1990 and 1 July, 15 July, and 30 August 1991. No statistically significant reductions in necrotic ring spot, relative to the untreated control, were obtained with any of the N-sources included in this test. Due to the intensity of disease development at this site, the authors consider this trial to be a severe test of any disease suppressive properties of these N-sources."
Note:Reprint appears in Biological and Cultural Tests for Control of Plant Diseases, Vol. 7 1992, p. 109
This item is an abstract and table only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hoyland, B. F., and P. J. Landschoot. 1991. Effect of various nitrogen sources on necrotic ring spot development. Turfgrass Research Results 1990/1991 [Penn State]. p. 102.
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