Botanic Garden >> Gardening > >> Question and Answer >> About Gardening

Cedar-Hawthorn Rust on Serviceberry (Amelanchier)

Q: Orange 'horns' on my amelanchier fruit. What is this?

A: Cedar-hawthorn rust. Spores alternate between juniper/cedar and hawthorn/amelanchier. Nearby junipers have swollen orange twigs in spring (spore stage). Remove and destroy infected serviceberry fruits. If you have junipers, prune out swollen twigs.

About Gardening: Rose Rust in July: Not Just Spring Disease Anymore; Rust Disease on Chemical-Free Lawn: Let It Run Its Course; Lawn Rust Disease: Cultural Control Without Fungicides; Managing Iris Rust Without Starting Over; Best Tree-Form Serviceberry: 'Princess Diana' or 'Autumn Brilliance'; Bradford Pear Cedar-Quince Rust: Orange Spikes on Fruit; Cedar Apple Rust: Those Orange Gobs on Your Red Cedar; Daylily Rust: Fungicide Options for Home Gardeners; Hollyhock Rust on High Mallow: Identification and Management; Daylily Rust: Identification and Persistent Fungicide Program

Garden Articles

Treating Rust Spots on Cucumber Leaves

Serviceberry Tree (Amelanchier): Beauty, Hybrids & Diseases

Downy Serviceberry (Amelanchier arborea): Four-Season Native for Edible Landscapes

Alder-Leaved Serviceberry (Amelanchier alnifolia): Native Shrub with Edible Berries and Fall Color

Rust Diseases: Identification and Management

Zoysia Rust: Fertilize and Mow Frequently

Italian Cypress Rust Spots: Fungus, Mites, or Root Rot? Diagnosis and Options

Plants

Indian Hawthorn Rust: Juniper Connection and Fungicide Schedule

Rust-Colored Gravel and Cedar Needles: Fertilizer or Irrigation Overspray?

Snapdragon Rust: Identification, Prevention, and Control

Cedar-Quince Rust: A Dual-Host Disease

Orange Powder on Zoysiagrass? It's Likely Rust Disease

Oxalis Rust: Managing the Orange Spots on Your Shamrock Plant

Fusiform Rust on Pine: Orange Spores Signal Internal Decay