Hampshire,
United Kingdom 
my bay tree has white spots on the trunk
2 Aug, 2010
Answers
Not terribly helpful, not enough info, but I'm willing to bet its probably scale infestation, though a photo would be useful to be sure.
2 Aug, 2010
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how big are they?
only it sounds like some sort of fungus perhaps someone else can back me up on this
2 Aug, 2010