First Report of the Early Spore Stages of Sunflower Rust, Caused by <i>Puccinia helianthi</i>, in Nebraska

Fig. 3. Orange-yellow aecia arranged in rings found on lower surface of cotyledons of sunflower volunteer.



Image from Plant Health Progress article:
First Report of the Early Spore Stages of Sunflower Rust, Caused by Puccinia helianthi, in Nebraska