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| Sclerotinia homoeocarpa
Disease description
Spots of straw color, roughly circular, recognizable when 1 to 2 cm in diameter with delicate mycelium .stretching from leaf to leaf, apparent when dew is present. Individual leaf blades may show both damaged and uninfected sections. Spots may remain discrete to about 7 cm in diameter in fine turf and then coalesce. In longer tuff, individual spot margins are not so clearly defined. The disease is common only in eastern Canada, from spring to fall.
Predisposing factors
- most grasses are susceptible, but in eastern Canada Agrostis spp. are the species usually infected
- low soil fertility
- heavy, prolonged dews
- uncontrolled infection from previous year
- continual use of one fungicide will allow the fungus to develop resistance
Cultural control
Disperse dew early in the morning by switching, poling or hose-dragging during summer. Reduce barriers to air flow over turf surface and facilitate free drainage. Symptoms may be suppressed by application of nitrogenous fertilizer during summer. Attend to overall soil fertility. Remove clippings which carry infection. Little information on cultivar resistance is available in Canada.
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For information about other diseases that affect turf grasses, go to Major Diseases of Turf Grasses in Western Canada. |
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For more information about the content of this document, contact Ron Howard.
This document is maintained by Shelley Barkley.
This information published to the web on November 20, 2001.
Last Reviewed/Revised on November 7, 2007.
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