Pussy Willow Rust and Caterpillars: Dual Treatment for Fungus and Insects

Two Separate Problems

Yellow powder on leaf undersides = Rust (fungal). Lemon-yellow spots become spore pustules. Can defoliate young trees.
Caterpillar feeding on leaves.

Rust: Collect/destroy fallen leaves. Prune affected branches. Spray copper fungicide on foliage.
Caterpillars: Apply acephate (Orthene) or other labeled insecticide.

Space plants for air flow. Avoid overhead watering. Monitor weekly in spring.

Plant Diseases: Willow Weevil/Leaf Beetle: ID First, Then Treat; Willow Tree Partial Leaf Yellowing: Water Needs and Trunk Check; Kilmarnock Willow Scab and Canker: Pruning and Cultural Control; Weeping Pussy Willow Sudden Decline: Water, Blight, or Canker?; Black Spots on Weeping Willow: Late-Season Cleanup and Spring Spray Plan; How to Root Pussy Willow Cuttings Successfully; Rooting Pussy Willow Cuttings in Water or Soil; Rooting and Overwintering Pussy Willow Cuttings in the DC Area; Rooting Pussy Willow Branches from the Florist: Can You Grow a Tree from Cuttings?; Pruning Pussy Willow for Accessible Spring Catkins

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