Fig. 3. Aecium of hawthorn rust showing characteristic long aecial tubes By Kostina | Published 6 Dec 2013 | Full size is 1120 × 1058 pixels Fig. 2. Aecium of cedar apple rust on the underside of a leaf in August. Fig. 4. Rust-induced leaf spots on an apple cultivar that is resistant to cedar apple rust. Fig. 3. Aecium of hawthorn rust showing characteristic long aecial tubes Bookmark the permalink.