United Kingdom 
my bay trees have black dust on
2 May, 2010
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« Does anyone know of any good or nice ornamental grasses? I don't want any...
United Kingdom
my bay trees have black dust on
2 May, 2010
Previous question
« Does anyone know of any good or nice ornamental grasses? I don't want any...
Sounds like sooty mould - check the plant for scale insect, if not present, treat with an appropriate fungicide spray.
2 May, 2010