Disease	Symptoms	Pathogen/Cause	Management
Cytospora Canker	Slightly sunken cankers girdle and kill branches.	Valsa (asexual stage = Cytospora)	Prune infected branches.
Rust	Current season growth is slightly swollen and curled. Orange-yellow spores coat the infected tissue. Infected plant parts die in the summer. Orange-yellow spores develop on poplar leaves where the fungus overwinters.	Melampsora	No control is recommended for this fungus that overwinters on poplar and then spreads to hemlock and back to poplar.