Foam from 2-year-old willow = tree fighting bacterial/fungal infection. Good sign it's active, but needs help to win.
atomicgrow.net
Frothy Flux on Weeping Willow: Manage, Don't Panic
Weeping Willow Borer Damage: Treatment and Prevention
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Weeping Willow Decline: Black Trunk, Holes, and Yellowing Leaves
Weeping Willow Borer Infestation: Identification and Treatment
Weeping Willow Near House & Drain: Root Concerns & Growth Regulators
Curly Willow (Corkscrew Willow): Unique Form for Year-Round Interest
Chinese Weeping Willow: History, Medicinal Uses, and Landscape Value
Dwarf Weeping Willow (Kilmarnock): Perfect for Small Gardens
How to Plant and Establish a Weeping Willow Tree Successfully
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