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Sticky Sap on Deck from Oak Tree: Lecanium Scale Solution

The “raining sap” is honeydew from lecanium scale high in the oak. It fuels black sooty mold. Treat with imidacloprid (Bayer Tree & Shrub) soil drench each early April. Full control may take two years.

About Gardening: White Oak Weeping Sap: Slime Flux Explained; Black Oak Slime Flux: Bacterial Sap Flow Management; Pin Oak Bleeding Sap: Bacterial Wetwood or Decay?; Dead Pin Oak Standing Time: St. Louis Timeline; Identifying Oak Galls: The "Hollow Bulbs" on Scrub Oak; Oak Tree Slime Flux: Managing Sap Flow and Hornet Attraction; Live Oak with Weeping Holes: Sapsuckers, Not Borers; Diagnosing and Treating Honeydew Dripping from an Oak Tree; Aphid Honeydew on Red Oak: The Real Cause of "Sap" Dripping; Oak Dripping Sap: Lecanium Scale Honeydew, Not Tree Sap

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