The cedar rust diseases (Juniper spp.) stand out due to their conspicuous nature, and the fact the fungi that cause them complete their life cycles on two plant hosts — the juniper (cedar) and the apple (although pear, hawthorn, quince, serviceberry, and crabapple are other hosts). All potential host plants are commonly planted in the urban landscape, or are native to the Midwest. In Indiana, there are three common juniper rust diseases, Cedar-Apple Rust, Cedar-Hawthorn Rust, and Cedar-Quince Rust.

Regardless of the disease, these rust fungi have similar life cycles and cause similar symptoms in their hosts. In the spring, orange gelatinous horns develop from gray to brown colored fungal galls on the branches of infected junipers. These horns produce wind-blown spores that can infect apple and crabapple trees.

For more information, including management, please refer to our publication, “Cedar Apple and Related Rusts on Landscape Plants,” at: [ Ссылка ]
0:00 Introduction
0:34 Cush-balls
1:30 Spores
1:50 Symptoms and Signs

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