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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Diseases

Cottony Camellia Scale on Holly: Fall Treatment Window

Holly has small white rectangular shapes on leaf undersides. Owner washed and soap-sprayed.

Identification

Rectangular shape = cottony camellia scale. Compare to OSU images: link.

Treatment Timing

  • Standard: dormant season (winter) oil sprays.
  • Alternative: imidacloprid soil drench in fall.

Soap spray gives partial control; oil or systemic needed for eradication.

Plant Diseases
Variegated Holly Leaf Discoloration: Treating Fungal Leaf Spot
Variegated Holly Losing Lower Leaves: Scale and Chlorotic Shoots
Holly Bush Decline Linked to Poor Drainage and Excess Water
Diagnosing Holly Leaf Spots and Pruning Guidelines
Holly Bush Sooty Mold and Scale/Aphid Infestation
Blue Princess Holly Scale: Horticultural Oil or Sevin, Plus Fertilizer
Holly Leafminer Infestation: Systemic Insecticide and Fertilization
Reviving a Declining Female Holly Bush: Water, Fertilizer, and Diagnostic Steps
Holly Bush Covered in Yellow "Flowers" in May: It's Pollen!
Bees on Holly Berries: Beneficial Pollination Activity
Garden Articles

Self‑Fertile Holly No Berries: Weather Stress or Thrips?

Identifying and Managing Powdery Mildew on Holly Bushes

Holly Bush Winter Burn: Pruning, Watering, and Anti-Desiccant Prep

Black Sooty Mold on Holly: Control the Sucking Insects First

Managing Tar Spot and Scale on Holly Bushes

Sooty Mold and Scale on Holly: A Two-Step Treatment Plan

Treating Scale Insects on Holly Bushes

Plants

Holly Aphids: Why They Don't Spread to All Plants

Flies on Holly Bush: Likely Attracted to Flowers; Contact Local Extension

Holly Leaf Spot: Fungicide Too Late Now, Plan for Spring

Holly Leaf Miner Control: Systemic Insecticide Timing and Life Cycle

Holly Bush Turning Brown After Winter: Winter Damage Recovery

Holly Bush Dying: Scale Insects or Winter Injury

Mature Holly Sudden Defoliation: Winter Desiccation from Temperature Swing

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