Corkscrew Willow Leaf Spots: Rake and Fertilize, Don't Spray

Case

Corkscrew willow: black spots on leaves. Remedy?

Expert Advice (Steve)

• Large tree = spraying impractical/uneconomical.
• Leaf spots rarely impact health significantly.
• Rake/destroy fallen leaves before spring (reduces inoculum).
• Maintain vigor: Soil test-based fertility + ample water.

If Small Tree

Fungicide options (chlorothalonil, mancozeb) at bud break, but cost/benefit questionable.

Willows are tough. Spots are cosmetic. Invest energy in soil health, not sprays.