Euonymus Scale: Comprehensive Control Strategy

Pest Profile

White specks on leaves/branches + dying areas = Euonymus scale (Unaspis euonymi). Armored scales encrust twigs/leaves; suck sap → yellow spots, dieback, plant death.

Control Pyramid

1. Cultural: Proper fertility/water (stress → scale). Avoid over-fertilizing (N favors scale). Prune heavily infested branches.
2. Mechanical: Scrape scales; high-pressure water spray.
3. Horticultural oils: Dormant (Feb–Mar) or summer (superior/supreme). Suffocation. Less effective with layered scales.
4. Insecticidal soaps: Contact kill crawlers. No residue; repeat needed.
5. Synthetic crawler sprays: Orthene, Ortho Systemic, Bayer Multi-Insect, Ortho Bug-B-Gon. Timing: May, June, July (crawler peaks).
6. Systemic (Imidacloprid): Bayer Advanced Tree & Shrub drench. Root uptake → ingested by sap-feeders. Apply weeks before crawler emergence.

Success Indicators

• Live scales "bleed" when crushed; dead = dry.
• New foliage healthier, earlier bud break, normal color.

Systemic imidacloprid drench is easiest for homeowners. Apply early spring for season-long control.