Influence of canopy structure on tall fescue cultivar susceptibility to brown patch disease

Gary Y. Yuen, Loren J. Giesler, Garald L. Horst

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Tall fescue (Festuca aurundinacea) cultivars were evaluated under growth chamber and field conditions for susceptibility to brown patch disease caused by Rhizoctonia solani. Percentage foliar necrosis varied among cultivars in growth chamber experiments. Kentucky-31 was the least susceptible cultivar (cv.), sustaining <25% necrosis 6 days after inoculation with the pathogen. Severity of necrosis in other cvs under the same conditions was as high as 88%. Brown patch disease development in the field was lowest in cv. Kentucky-31 among nine cvs evaluated over two years. Average blight severity in cv. Kentucky-31 in 1991 was 34%, compared with 60% in the most susceptible cv., Trailblazer. Similarly in 1992, cvs Kentucky-31 and Trailblazer had the lowest and highest levels, respectively, of brown patch lesion development. Leaf blade density and verdure in the field varied among the cvs. Blade density and verdure correlated (r = 0.78 and 0.68, respectively; p < 0.05) with the extent of lesions measured in 1992, but were not related to mean blight severity measured in 1991. Field disease levels observed in both years had low correlations (r = 0.59; p = 0.10) with levels of necrosis measured in the growth chamber.

Original languageEnglish (US)
Pages (from-to)439-442
Number of pages4
JournalCrop Protection
Volume13
Issue number6
DOIs
StatePublished - Sep 1994

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Keywords

  • Rhizoctonia blight
  • canopy morphology
  • turfgrass

ASJC Scopus subject areas

  • Agronomy and Crop Science

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