Cottony Scale on Magnolia: Not Fungus, But Insect Infestation

After gypsy moths left a magnolia, the owner noticed abundant flies on mulch and in the tree, plus white-to-beige "fungus" on branches.

Correct ID: Cottony Scale (or Cottony Aphid)

The white material is wax secreted by scale insects, not fungus. They suck plant juices, producing sticky honeydew that attracts flies and ants. Sooty mold often grows on the honeydew.

Control Options

• Systemic soil drench: Imidacloprid (Bayer Advanced Tree & Shrub Insect Control) applied to root zone—translocates to leaves, kills feeding scales.
• Foliar sprays: Acephate (Orthene/Isotox) works systemically through leaves.
• Timing: Target crawler stage (mobile nymphs) for best results.

Healthy trees tolerate light infestations. Heavy outbreaks weaken trees; treat if extensive.