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Willow Tree Leaf Drop

Can anyone help please
Have a willow tree which seems to have excessive leaf drop
Have a willow tree which seems to have excessive leaf drop
You can see the yellow leaves on the tree and with a gentle breeze they fall off and it looks like it is snowing leaves 
The leaves which have come off seem to have black spots on them. The tree does seem to be producing new leaves but then I think they are getting the black spots and falling.
one picture shows the leaf fall after about one hour of a gentle breeze, another of what fell over the night and another picture of the black spots on the leave and stems


We have only been in our house for 9 weeks and are not familiar with willow trees
The tree I would think is 20 - 30 years old

The leaves which have come off seem to have black spots on them. The tree does seem to be producing new leaves but then I think they are getting the black spots and falling.
one picture shows the leaf fall after about one hour of a gentle breeze, another of what fell over the night and another picture of the black spots on the leave and stems



We have only been in our house for 9 weeks and are not familiar with willow trees
The tree I would think is 20 - 30 years old

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The tree does appear pretty healthy looking from a distance.
Is there anything that I can put on the tree apart from spraying as the tree is too big to spray with a pesticide.
Is it likely that the anthracnose disease will go on its own
The more stressed a tree is the more likely it is to suffer from disease ... the stronger the tree the more likely it will be able to shrug it off ... willows need a great deal of water and we had a very dry spring ... March and April were almost entirely without rain ... so unless your tree is close to a riverbank or lake it’s roots are likely to be too dry, and now any rain we get is unlikely to penetrate the umbrella effect oh the trees canopy, so I would put a hosepipe near the roots and leave it to trickle gently for 24 hours. I’d probably do that at least once a fortnight for July and August too.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.