Potential Risk of Commercial Geranium to Infection by <i>Puccinia pelargonii-zonalis</i>

Fig. 1. Sporulating lesions of P. pelargonii-zonalis on the abaxial surface of a leaf. Note the formation of a whitish ring (arrow) around the initial central infection point that will form additional lesions as the disease progresses.



Image from Plant Health Progress article:
Potential Risk of Commercial Geranium to Infection by Puccinia pelargonii-zonalis