Lilac tree: curled leaves with brown patches

Good afternoon,
Could anyone advise what might be wrong with my lilac tree? Planted 8 years ago. South facing but often shaded by two beech trees so doesn't flower much. In May I noticed the leaves at the top started to curl, thought it might be a bit thirsty so watered it well a few times. The curling continued and it


⁹now has brown spots on the leaves.
Is it a nutrient deficiency? Would bone meal help? I will attach photos which are likely to be upside down!😄
Many thanks
Could anyone advise what might be wrong with my lilac tree? Planted 8 years ago. South facing but often shaded by two beech trees so doesn't flower much. In May I noticed the leaves at the top started to curl, thought it might be a bit thirsty so watered it well a few times. The curling continued and it




Is it a nutrient deficiency? Would bone meal help? I will attach photos which are likely to be upside down!😄
Many thanks
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