Walnut tree not producing
I have a well established Walnut tree in my front garden (at least 50 years old). Since I have lived here (6 years) it has produced a huge amount of walnuts each year.
Last year the crop was down by around 40% with the walnuts slightly smaller than usual.
This year, there isn't a single walnut on the tree. Nothing! I know it is still early but I would usually at least see them forming at this stage. During Spring this year most of the new shoots went black and fell off. Following that however the leaves all grew normally and the tree looked completely healthy throughout the Summer (although it took longer to look completely 'normal')
Is this a normal cycle for a Walnut tree or does it sound like a problem - considering what happened in Spring?
The surrounding area hasn't changed, I have never treated it. Pretty much left it to its own devices aside from a proper professional prune three years ago.
Any advice would be really welcome.