Full TGIF Record # 66959
Item 1 of 1
Publication Type:
i
Report
Author(s):Brede, A. D.; Williams, R. R.
Author Affiliation:Simplot Turf & Horticulture
Title:Resistance of Kentucky bluegrass mixtures to necrotic ring spot, 1999
Section:Turfgrass
Other records with the "Turfgrass" Section
Source:Biological and Cultural Tests for Control of Plant Diseases. 2000, p. 52.
Publishing Information:St. Paul, MN: The American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Poa pratensis; Necrotic ring spot; Disease resistance; Cultivar evaluation; Seed mixtures; Lolium perenne; Lawn turf; Quality; Disease severity; Festuca arundinacea; Festuca ovina subsp. ovina
Abstract/Contents:"Field plots, 0.9 by 1.5 m, were seeded 17 Aug 93 near Rathdrum, ID, in a split-plot experimental design with 3 replicates. The mixture species (see bottom of table) constituted the whole plots, bluegrass varieties were subplots. All bluegrasses were seeded at 10g/mĀ². The fescues were seeded at 40 g/mĀ² to constitute an 80:20 fescue-blue mixture by seed weight. Ryegrass was seeded at 2.5 g/mĀ², for a 20:80 rye-blue mixture. The area was irrigated, fertilized, and mowed (50 mm) to simulate a home lawn. Turfgrass quality ratings were taken on a scale of 1 to 9 in which: 1=poor quality; and 9=ideal turf. Number of quality ratings per year: 2 in 93, 4 in 94, 4 in 95, 1 in 96, 1 in 97, 1 in 98, 4 in 99. Symptoms of necrotic ring spot (NRS) developed for the first time in 1998; NRS was rated on 20 Oct 99 on a 1 to 9 scale in which: 1=severe blighting; and 9=symptomless turf. Mixing turfgrasses is often seen as a cultural cure for NRS. Within 2 years of sowing, sheep fescue populations declined to zero, with a corresponding increase in percent bluegrass. Tiller populations (%) of tall fescue (vs. bluegrass) dropped slowly from 90% initially to about 20% at trial's end. Ryegrass levels remained constant. ANOVA showed no significant bluegrass x mixture species interaction for quality or NRS. Adding ryegrass or tall fescue to bluegrass enhanced turf quality but did not improve NRS resistance when averaged across varieties. Adding sheep fescue decreased NRS resistance slightly."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brede, A. D., and R. R. Williams. 2000. Resistance of Kentucky bluegrass mixtures to necrotic ring spot, 1999. Biol. Cult. Tests Control Plant Dis. p. 52.
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