From the ArcaMax Publishing, Gardening Newsletter:
http://www.arcamax.com/news/gardening/s-2547-559363
Orange spots on leaves indicate hollyhock rust disease. Under warm, rainy conditions the fungus splashes onto the lower leaves and spreads throughout the plant. Mulch plants early in the season with hay or straw to stop this disease.
This news arrived on: 07/03/2009