3/4 of tree covered in sticky debris = honeydew from insects or bacterial infection. Also a defense sign—tree has immune response.
Great picture provided by Dianne.
Flowering Plum Peachtree Borer: Comprehensive Pest Management Guide
Plum Tree Loose Bark with Magenta Spores: Complex Diagnosis Needed
Blue Plum Fruit Rot: Brown Rot Disease
Plum Tree Brown Rot: Sanitation and Fungicide Timing
Plum Fruit Drop: Water, Pollination, or Fungus?
Plum Aphids in Curled Leaves: Atomic Grow and Pure Neem Oil
Japanese Plum Tree Rabbit Damage: Bridge Grafting to Save Girdled Tree
Ornamental Plum Chlorosis: Iron Deficiency or Soil Problem?
Plum Tree Curled Leaves with Tubes: Leaf Curl Plum Aphid
Flowering Plum After Hard Freeze: Scratch Test for Life
Indoor Palm Sticky Leaves: Scale Insects and Organic Solutions
Flowering Plum Defoliation: Japanese Beetle Feeding
Plum Tree Soft Bark Bumps: Scale Insect Infestation
Plum Tree Stress After Aphid/Ant Infestation: Water and Organic Sprays
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