Birch Rust (Melampsoridium betulinum)

Birch Rust (Melampsoridium betulinum)

Observation - Birch Rust (Melampsoridium betulinum). Description: A birch tree (Paperbark Birch (Betula papyrifera), I think) is badly infected with this rust this year. The whole surrounding area is covered in a fine yellow dust from it. I think it may be Melampsoridium betulinum which has Larch (Larix) species as an a

A birch tree (Paperbark Birch (Betula papyrifera), I think) is badly infected with this rust this year. The whole surrounding area is covered in a fine yellow dust from it. I think it may be Melampsoridium betulinum which has Larch (Larix) species as an alternate host but I'm not aware of any of these in the immediate area.