Jim's grapefruit tree shows leaf spotting (photo provided).

Kathy identified greasy spot fungus—especially attacks grapefruit.
Greasy spot is a classic citrus fungal disease. The organic approach aligns with food safety preferences for fruit-bearing trees.
Dwarf Grapefruit in Greenhouse: Leaf Yellowing and Browning
Tulip Tree Troubles: Sapsucker Damage and Basal Decay
Fungus on Fig Tree Trunk: Wood Decay Warning
Pecan Tree Nut Problems: Weevils, Scab, and Spray Schedule
Kwanzan Cherry Oozing Sap: Bacterial Canker or Mechanical Injury?
Mystery Blob at Mulberry Base: Fungus or Harmless Slime Mold?
Gray Fungus on Large Trees: Lichens, Not a Disease
Cottony Scale on Magnolia: Not Fungus, But Insect Infestation
Magnolia Tree Decline: White Bark Growth and Leaf Spots in Fort Worth
Tree Decay Fungus: Fruiting Body Identification
Diagnosing Trunk Rot on Cold-Hardy Palms: When to Call Extension Services
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