If shiny and sticky, it's honeydew from sap-feeding insects (aphids, scale). Control insects to stop honeydew and sooty mold. If thick and resinous, it's a wound response—inspect for injury or borers.
Powdery Mildew on Cherry Tree: Identification and Control
Forsythia Dieback: Stem Splits, Borers, and Wet Soil Management
Mysterious White Foamy Growth on Maple Trunk: Not Slime Flux
Diagnosing Single Holly Bush Leaf Curl
Dual Treatment for Crape Myrtle Scale and Powdery Mildew
Rose Bushes Summer Yellowing: Black Spot on Grafted Roses
Green Scale on Citrus and Ornamentals: Organic Control of Coccus viridis
Gardenia Bushes Drooping After Pine Removal and Fresh Compost
Gooseberry and Redcurrant Defoliation: Gooseberry Sawfly—Neem + Oil Spray
Outdoor Ficus "Spores": Leucocoprinus Mushrooms Are Harmless
Sooty Mold on Houseplants: Amaryllis and Ficus
Lilac Bud Damage from Spring Cold Snap
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