Posted: 23/06/2014 at 16:34
My privet hedge has died in places but it's ancient (1960) and worn out.
How old is yours?
I have honey fungus in part of the garden but have only seen the famous 'bootlaces' under the bark of dead large trees. Also the symptoms have not involved black leaves. More failing growth with sparse yellow and brown leaves through a summer followed by non-appearance the next year.
I've put in links to the RHS on HF and wilt that may be useful if only to eliminate. Have you checked for obvious pests and damage to bark. I lost large lumps of privet when the bank voles ate the bark, little b......s