Serviceberry Tree
(Amelanchier spp.)
Serviceberries are excellent ornamental trees for flowers, berries, and fall color, but in Colorado they may develop fire blight, rust, aphids, leaf spot, and drought stress.
Seasonal Pest & Disease Calendar
| Problem | Type | Active Season |
|---|---|---|
| Fire blight | Bacteria | Spring–Summer |
| Rust | Fungus | Spring–Summer |
| Leaf spot | Fungus | Spring–Summer |
| Aphids | Insect | Spring–Fall |
| Scale insects | Insect/scale | Spring crawlers; visible year-round |
| Spider mites | Mite | Summer |
| Drought stress | Abiotic | Summer–Fall |
Pest & Disease Guide (Homeowner-Friendly)
Fire Blight
Common symptoms- Blackened twigs
- Wilted blossoms
- Prune infected tissue
- Sanitize tools
Rust
Common symptoms- Orange spots
- Fruit blemishes
- Reduce nearby juniper source
- Improve airflow
Leaf Spot
Common symptoms- Spotted leaves
- Early drop
- Clean up leaves
- Improve airflow
Aphids
Common symptoms- Honeydew
- Leaf curl
- Rinse foliage
- Encourage predators
Scale Insects
Common symptoms- Bumps on stems
- Canopy thinning
- Treat crawler stage
- Horticultural oil
Spider Mites
Common symptoms- Bronzed leaves
- Fine webbing
- Increase watering
- Rinse canopy
Drought Stress
Common symptoms- Scorch
- Poor fruiting
- Deep watering
- Mulch base
When to Worry vs. When It’s Cosmetic
When to Worry (action recommended)
- Repeated fire blight
- Severe rust infection
- Heavy dieback
These can reduce bloom, fruit, and long-term vigor.
Mostly Cosmetic (monitor only)
- Minor spotting
- Light aphids
- Some summer scorch
These often improve with seasonal care and irrigation.