Posted: 02/08/2012 at 21:38
I had just such a problem the other year. I put it down to low light levels and a general malaise of poor seasonal weather. A lot of rain promoted lush, weak growth, although the soil was far from waterlogged.
Advice that I was given was to give it a bit of a feed and see how it responded. It didn't. That is why it is, sadly, so more.
I don't know if my diagnosis was correct, or if the advice that I was given was poor. But sometimes a plant reaches a point beyond which it cannot be saved. I hope this is not the case with your tree - but I would be prepared for the worst, and pleased if next year it manages to perk up. (or, hopefully, there may be better advice from more knowledgeable posters here.)