Cause Fusarium oxysporum f. sp. perniciosum has been diagnosed a few times in Oregon by the OSU Plant Clinic. Soilborne fungus that is difficult to control. The cultivars Tryon and Charlotte are reported to be resistant.
Symptoms Leaf wilting and defoliation along with internal black streaks in the wood and eventually tree death.
Cultural control Remove and destroy diseased trees.
Reference Berbegal, M., Marín-Terrazas, M., Ramón-Albalat, A., León, M., and Armengol, J. 2016. First Report of Fusarium wilt of Albizia julibrissin caused by Fusarium oxysporum f. sp. perniciosum in Spain. Journal of Plant Pathology 98:694.