August 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.
Late summer/early fall is the time for good sales on many trees and shrubs. However, many people buy trees and shrubs from a garden center or nursery without knowing the basics for selecting high quality nursery stock. Here are some suggestions on how to select healthy trees and shrubs.