Lilac Leaf Spots and Curl: Need Photo for Accurate Diagnosis

20-year-old lilac in Pacific NW shows brown leaf spots and slight curl, spreading to two 5-year-old nearby lilacs.

Information Needed

Send close-up photo of affected leaves (in focus). Also: (1) Are spots widespread? (2) Do they cause leaf drop or just cosmetic? (3) Are other trees also lilacs? (4) When did spots first appear (year/month)? (5) Is it worsening?

Next Steps

Photo will enable specific diagnosis. Possible causes: fungal leaf spots, bacterial blight, insect damage, or environmental stress. Treatment depends on accurate ID.