Biological control of dollar spot disease of creeping bentgrass

Top-dressing creeping bentgrass with sand-cornmeal or chopped grain colonized by fungi or bacteria was tested as a means of suppressing the intensity of epidemics of dollar spot disease incited by Sclerotinia homoeocarpa. In a greenhouse, 45- to 90-day-old turfgrass grown in cups was top-dressed wit...

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Bibliographic Details
Published in:Phytopathology 1991-11, Vol.81 (11), p.1438-1446
Main Authors: Goodman, D.M. (University of Victoria, Victoria, B.C., Canada), Burpee, L.L
Format: Article
Language:English
Subjects:
ACREMONIUM
Agronomy. Soil science and plant productions
AGROSTIS STOLONIFERA
BACTERIA
Biological and medical sciences
Biological control
Control
CONTROL DE ENFERMEDADES
CONTROLE DE MALADIES
FONGICIDE
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
FUNGICIDAS
FUSARIUM
GIBBERELLA
MANCHAS
PESTICIDE MICROBIEN
Phytopathology. Animal pests. Plant and forest protection
PLAGUICIDAS MICROBIANOS
SCLEROTINIA HOMOEOCARPA
SINTOMAS
SYMPTOME
TACHE
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Summary:Top-dressing creeping bentgrass with sand-cornmeal or chopped grain colonized by fungi or bacteria was tested as a means of suppressing the intensity of epidemics of dollar spot disease incited by Sclerotinia homoeocarpa. In a greenhouse, 45- to 90-day-old turfgrass grown in cups was top-dressed with 1,500 cm3/m2 of sand-cornmeal infested by mycelium of S. homoeocarpa, followed by an equal amount of sand-cornmeal infested by potential antagonists. Four of 24 potential antagonists inhibited the growth of S. homoeocarpa and suppressed disease by 25-90%. In 1987, plots on a closely mown sward of creeping bentgrass were treated with inoculum of S. homoeocarpa and top-dressed weekly with sand-cornmeal (400 cm3/m2) infested by isolates of potential antagonists. Maximum disease intensities (percentage of plot area blighted) were 5, 18, or 44% in plots treated with sand-cornmeal infested by Fusarium heterosporum, an Acremonium sp., or an unidentified bacterium, respectively, during a 35-day epidemic, compared to 84% in plots not top-dressed and 64% in plots top-dressed with noninfested, autoclaved sand-cornmeal. In another experiment, maximum disease intensities were 31% in plots not top-dressed; 9% in plots top-dressed with noninfested, autoclaved chopped grain; or 3-6% in plots top-dressed with chopped grain infested by potential antagonists. In 1988, treatments at 2-wk intervals with sand-cornmeal infested by F. heterosporum (isolate pa 7) at 400 cm3/m2 limited disease intensity of a 78-day epidemic of dollar spot to 3%, compared to 18% in nontreated plots. Sterilization of sand-cornmeal infested by F. heterosporum (isolate pa 7) by heating to 70 C for 1 h did not significantly (P = 0.10) reduce efficacy. Results of laboratory and greenhouse experiments suggest that F. heterosporum (isolate pa 7) produces substances toxic to S. homoeocarpa
ISSN:0031-949X
1943-7684
DOI:10.1094/Phyto-81-1438