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

Magnolia Scale on Mature Tree: Oil Treatment Guide

Mature magnolia (NE US) has pencil-eraser white fuzzy patches on branches. Lift off → pink fleshy liquid oozes. Owner asks about systemic remedy.

Magnolia Scale Identification

Large scale (up to 1/2"). Pink liquid = body fluids. Armored scale = contact spray failure.

Recommended: Horticultural Oil

  • SunSpray (hose-end) or biorganic oils.
  • Spray to drip point weekly 3×.
  • Dead scale dislodge with hose.

Why Not Systemic

Magnolia size requires massive chemical volume; months to translocate. Impractical. Oil gives visible improvement in 3 weeks.

Safety

Oil is very safe. Thorough coverage essential.

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