Plant care guide
Schefflera Brown Spots on Leaves: Disease, Cold, Sun or Pests?
Updated
Why does my Schefflera have brown spots?
Brown spots on schefflera leaves come from leaf spot disease (fungal Alternaria or bacterial Pseudomonas, both favored by wet leaves), from cold or drafts, from direct sun, or from sap-feeding pests such as spider mites and scale. Spot shape, a yellow halo, the leaf surface and what is on the underside separate them.
What to do first
Turn a spotted leaflet over with a hand lens first. Remove leaflets with spreading, haloed spots and stop wetting the foliage. Move the plant away from cold glass, vents and hot direct sun, and treat mites or scale if you find them.
Brown spots on a schefflera look alarming, but they are rarely the end of the plant. Clemson Extension’s schefflera factsheet says plant diseases are very rarely a problem indoors. It names watering, insects, mites and cold as the main troubles. So check the growing conditions before you reach for a fungicide.
This applies to both plants sold as schefflera: the dwarf umbrella tree and the larger umbrella tree. NC State Extension files both under Heptapleurum. See how to identify a schefflera if you are not sure which you have.
Match the spot to the cause
| What you see | Most likely cause |
|---|---|
| Dark brown to black spots, often with a bright yellow halo, spreading under wet conditions | Leaf spot disease |
| Dead patches appearing a few days after a cold night or a draft | Cold injury |
| Pale or brown scorched areas on the leaflets facing a sunny window | Sun scorch |
| Fine pale speckling, faded or bronzed leaves, maybe webbing | Spider mites |
| Small immobile bumps on stems and undersides, sticky leaves, black film | Scale |
| Browning along leaflet edges and tips | Water stress or salts |
Leaf spot disease
Clemson’s disorders factsheet describes fungal leaf spots as small brown spots with yellowish margins, sometimes with a target pattern. Bacterial spots look water-soaked, sometimes with a yellow halo. University of Maryland Extension adds that fungal spots can run together into large blotches, and severe infections cause leaf drop (UMD: fungal leaf spots).
Two diseases are named for schefflera. Clemson notes that the cultivar ‘Amate’ resists Alternaria leaf spot. The Pacific Northwest Plant Disease Management Handbook describes Pseudomonas leaf spot on schefflera: tan to black lesions with a bright yellow halo, often on older leaves. It says warm, humid conditions such as frequent misting favor it. It also says the bacterial spot can be confused with the fungal Alternaria spot. Both respond to the same first steps, so you do not need a lab test to begin.
Cold, sun and water
Cold. Clemson says dead areas form on schefflera leaves several days after exposure to excessive cold. Keep the plant above 10 °C (50 °F), with nights above 16 °C (60 °F). Keep it away from air conditioners, open windows, radiators and heat vents.
Sun. NC State Extension says bright, direct light will burn the leaves of the dwarf umbrella tree indoors. It suggests filtered light, such as through a sheer curtain (NC State: Heptapleurum arboricola). Scorch shows on the most exposed leaflets and does not spread to shaded ones.
Water. Clemson’s disorders factsheet lists improper watering, hot dry air and salt buildup as causes of brown leaf tips and edges. Edge browning points to the root zone rather than to a spot disease. Clemson also notes cold water splashed on leaves can leave pale spots on some plants.
Pests
Clemson names mealybugs, scale insects and mites as the common schefflera pests. Its houseplant pests factsheet says spider mites cause light speckling that can bronze. It describes scale as small, immobile bumps on stems and leaf undersides. Soft scales leave sticky honeydew and black sooty mold. Our schefflera scale guide and schefflera pests guide cover treatment.
Clemson also lists schefflera among plants sensitive to insecticidal soap. It says pesticide injury can show as leaf spotting or burned edges. If spots appeared within days of spraying, the spray is a suspect.
What to do
- Look closely. Check both sides of a spotted leaflet with a hand lens. Note any halo, insects, webbing or stickiness.
- Remove spotted leaflets. Maryland and Clemson both advise picking off and destroying infected leaves. Clean your tools afterwards.
- Keep foliage dry. Stop misting and water the mix, not the leaves. Maryland suggests watering early in the day and spacing plants for air movement.
- Fix the spot. Move the plant out of drafts and away from cold glass. Shade it from hot direct sun.
- Check the mix. Clemson advises watering thoroughly, then letting the top 1.3 cm (½ in) dry before watering again. Never leave the pot standing in water.
- Treat pests only if you find them. Avoid insecticidal soap on schefflera.
- Watch new growth. Marked leaves do not heal. Judge progress by whether new spots stop appearing.
Clemson lists fungicides for houseplant leaf spots, but Maryland says removing infected parts and drier conditions usually work at home. If spots also come with heavy leaf loss, see why a schefflera drops leaves. For general care, start at the schefflera hub.
References
- Clemson Cooperative Extension HGIC 1511: Schefflera
- Clemson Cooperative Extension HGIC 2251: Houseplant Diseases & Disorders
- University of Maryland Extension: Fungal Leaf Spots on Indoor Plants
- Pacific Northwest Plant Disease Management Handbook: Schefflera, Pseudomonas Leaf Spot
- NC State Extension Gardener Plant Toolbox: Heptapleurum arboricola
- Clemson Cooperative Extension HGIC 2252: Common Houseplant Insects & Related Pests
How this guide was put together: Clemson Cooperative Extension, University of Maryland Extension, the Pacific Northwest Plant Disease Management Handbook and NC State Extension guidance.