Small, green, spike-like growths on plum leaves are spindle galls caused by microscopic eriophyid mites. They distort leaf tissue but rarely affect tree health or fruit production.
Natural predators keep mite populations in check. Chemical control is not warranted. If unsure, bring a sample to your local nursery for confirmation.
Magnolia Scale: White Specks on Leaves and Stems
Oak Leaf Blister: Cosmetic Fungal Disease
Ficus Leaf Spot (Cercospora): Fungus Management Indoors
Magnolia Leaf Blisters: Fungal Cause and Organic Treatment
Plum Tree "Ghost Leaves": Diagnosing Browning and Bud Check
Flowering Plum Pale Leaves and Trunk Swelling: Fertilizer Response and Wait-and-See
Plum Tree Shot Hole and Bark Bumps: Separating Insect Damage from Normal Lenticels
Oak Leaf Fungus at 5000 ft: Cosmetic Leaf Spot Management
Meyer Lemon Leaf Curl and Webbing: Mites, Leafrollers, or Thrips?
Cherry Leaf Spot: Fungal Disease on Flowering Cherry
Maple Leaf Spots in the Catskills: Harmless Cosmetic Issue
Leaf Damage on New Purple Leaf Plum
Troubleshooting Drosera capensis: Overwatering, Low Light, and Humidity Issues
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