Search articles from 1992 to the present. This article was
published originally on 8/10/2005 Hawthorns (Crataegus spp.) are
susceptible to Cedar-Hawthorn Rust, Cedar-Quince Rust and Cedar-
Apple Rust. Rusts are plant diseases caused by different species
of fungi which often complete their life cycle on two host
plants, in this case a cedar or a juniper, and a member of the
rose family such as apple, crabapple, serviceberry, quince and
hawthorn, among others. All three diseases are caused by
different species of the fungus Gymnosporangium. The symptoms
caused by the three different rusts are similar. Spore producing
structures, known as galls and aecia, are produced on the
evergreen and the rosaceous plants, respectively. However, the
three different rusts affect different parts of the rosaceous
host. Cedar-Hawthorn Rust affects leaves of hawthorns. During
rainy spring weather, the fungal spores are transferred from an
infected cedar or juniper to the surface of the hawthorn leaves
which, soon after the infecti