Candi from Albers Illinois writes
Propiconazole 14.3 Fungicide is labeled to target leaf blight, but we would also recommend reaching out to a local nursery, arborist or your local county extension office for more information and tips on treating this disease. Here is an article by the University of Illinois on Bur Oak Blight with some addtional information.
Answer last updated on: 09/28/2021