Bry.Rip Plant Guide
Scale Insects — photo 1
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Scale Insects 🐛

Moderate Pest also: scale, armored scale, soft scale

Affects these houseplants: Alocasia PollyAloe VeraAnthuriumAreca PalmBaby Rubber PlantBird of ParadiseBird's Nest FernBoston FernCast Iron PlantCebu Blue PothosChinese EvergreenChristmas CactusCorn PlantCrotonDieffenbachiaDracaena MarginataEnglish IvyFiddle-Leaf FigHeartleaf PhilodendronJade PlantLucky BambooMajesty PalmMarble Queen PothosMoney TreeMonsteraMonstera AdansoniiNeon PothosParlor PalmPhalaenopsis OrchidPhilodendron BirkinPhilodendron BrasilPhilodendron MicansPonytail PalmPothosRubber PlantSatin PothosScheffleraSyngoniumYucca CaneZZ Plant

Superfamily Coccoidea

At a glance

  • Looks like: Small, immobile brown/tan bumps on stems and leaf undersides
  • Tell-tale sign: Bumps that scrape off with a fingernail; sticky leaves below them
  • Severity: Moderate — easy to miss until sticky residue appears

How to identify

Scales are odd-looking sap-suckers that, as adults, settle in one spot and form a protective shell-like bump (1–5 mm), usually brown, tan, or grey, along stems, midribs, and leaf undersides. They look more like part of the plant than an insect. Soft scales secrete sticky honeydew (leading to shiny leaves and black sooty mold); armored scales don’t. The giveaway: you can scrape or pop them off with a fingernail, revealing the soft insect underneath.

Damage

Sap feeding causes yellowing, weak growth, and leaf drop; honeydew and sooty mold foul foliage and attract ants.

Treatment (least-toxic first)

Following Integrated Pest Management:

  1. Physical: Isolate. Scrape off what you can; rub stubborn ones with a 70% alcohol-dipped swab or cloth.
  2. Horticultural oil: The go-to for scale — it smothers them. Coat stems and leaf undersides thoroughly; repeat every 1–2 weeks. (Best on the mobile “crawler” stage.)
  3. Insecticidal soap on crawlers as a supplement.
  4. Prune heavily infested stems.
  5. Persistence: Scale is stubborn — expect several weeks of repeat treatment.

Prevention

Inspect new plants closely (scale rides in on them); control ants, which farm and protect scale for the honeydew.

Affects (in this guide)

Fiddle-Leaf Fig · Pothos · Monstera

Sources