Cherry Tree
(Prunus spp. — ornamental and fruiting cherries)
Cherry trees are loved for their spring flowers and ornamental value, but they can be sensitive in Colorado. Common issues include canker, borers, aphids, leaf spot, and environmental stress from drought and heat.
Seasonal Pest & Disease Calendar
| Problem | Type | Active Season |
|---|---|---|
| Cytospora canker | Fungus | Spring–Fall |
| Shot hole disease | Fungus/Bacteria | Spring–Summer |
| Peach twig borer / borers | Insect | Spring–Summer |
| Aphids | Insect | Spring–Fall |
| Spider mites | Mite | Summer |
| Brown rot | Fungus | Spring–Summer |
| Environmental stress | Abiotic | Summer–Fall |
Pest & Disease Guide (Homeowner-Friendly)
Cytospora Canker
Common symptoms- Amber gum oozing
- Sunken bark
- Dieback
- Prune infected limbs
- Reduce drought stress
Shot Hole Disease
Common symptoms- Small holes in leaves
- Brown spotting
- Clean up leaves
- Avoid overhead irrigation
Borers
Common symptoms- Flagging tips
- Branch dieback
- Prune affected shoots
- Reduce stress
Aphids
Common symptoms- Leaf curling
- Honeydew
- Rinse foliage
- Encourage predators
Spider Mites
Common symptoms- Bronzed leaves
- Fine webbing
- Increase irrigation
- Rinse canopy
Brown Rot
Common symptoms- Blossom blight
- Rotting fruit or twigs
- Remove infected tissue
- Improve airflow
Environmental Stress
Common symptoms- Scorch
- Premature leaf drop
- Deep watering
- Mulch base
When to Worry vs. When It’s Cosmetic
When to Worry (action recommended)
- Spreading cankers
- Heavy dieback
- Repeated borer damage
- Severe blossom or fruit loss
These can shorten tree life and reduce ornamental value.
Mostly Cosmetic (monitor only)
- Minor aphids
- Light spotting
- Occasional mite damage
These usually improve with good pruning and irrigation.