Inverness-Shire,
United Kingdom 
my curly leaf willow trees were doing fine but then their leaves all turned brown and died. Why?
22 Jul, 2010
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Drought? Is that a possibility where you are? A spell of dryness lasting 6 weeks earlier in the year could have caused this, but you don't give enough info really - you don't say how long you had the trees (recent plantings?) nor whether there were any signs of infestation or disease.
23 Jul, 2010