🛡️ Scale

How to identify

Look for immobile bumps on stems and leaf undersides — brown, tan, white, or waxy domes ranging from pinhead to pea size that don't brush off easily. Flip a leaf and check for sticky honeydew and the black sooty mold that grows on it.

Damage signs

Leaves yellow and drop, twigs die back, and whole branches can decline as hundreds of scale insects drain sap. The honeydew they excrete coats everything below in sticky film that turns black with sooty mold and blocks sunlight.

Plants it attacks

Citrus, fruit trees, ornamentals, houseplants, hibiscus, gardenias, many shrubs

Non-chemical controls

• Scrub light infestations off stems with a soft brush or old toothbrush dipped in plain water — satisfying, effective, and oddly therapeutic.
• Prune out heavily encrusted branches and dispose of them in the trash, not the compost pile.
• Catch the crawler stage: wrap stems with double-sided tape in spring to trap the tiny mobile juveniles before they settle and grow armor.
• Block the ant alliance with sticky bands around trunks — ants protect scale from predators in exchange for honeydew.
• Release ladybugs and lacewings, or let native parasitoid wasps work; a healthy predator population keeps scale in check year-round.
• Hit crawlers with a hard water blast in spring when the juveniles are mobile and unarmored — timing is everything.