What's Eating Your Rubber Plant?

Ficus elastica

Reviewed by Kiersten Rankel M.S.

Quick Answer

For rubber plant, the most likely culprits are scale insects (Ficus is famously scale-prone, with brown bumps along the trunk and leaf petioles) and mealybugs in the petiole-stem joints. Spider mites show up in winter dry heat and bronze the glossy leaves. Thrips are less common but happen.

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What does the damage look like?

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Brown bumps on trunk and petioles

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White cottony tufts in leaf joints

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Dull bronzed leaves and fine webs

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Silver streaks on glossy leaves

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Pests, ranked by impact

Brown soft scale (Coccus hesperidum) clustered on a plant stem

Scale insects

Damage

High

Removal

Hard

What it looks like

Hard or soft brown bumps stuck to the woody trunk, leaf-petiole joints, and along the underside of leaves near the central vein, 1 to 4 mm wide. Look like tiny barnacles glued in place. Ficus species are famously scale-prone, more so than almost any other houseplant.

What the damage looks like

Yellowed patches around each cluster. A sticky shiny film on lower leaves and the floor below the plant, often with sooty black mold. Untreated colonies along the trunk can defoliate whole sections, dropping leaves up the woody stem until only the top tuft remains.

How to get rid of them

Option 1

Scrape with a fingernail or soft toothbrush

Scale insects are stuck under a waxy seal. Scrape every visible bump off the trunk, petioles, and leaf undersides. Rubber plant's thick waxy leaves and woody trunk take a fingernail or soft toothbrush very well. Wipe up any white latex sap that seeps from scrape sites with a damp cloth.

Option 2

Cotton swab + 70% alcohol, weekly for 4 weeks

After scraping, dab any remaining bumps with a cotton swab dipped in 70% isopropyl alcohol. The alcohol penetrates the waxy seal and kills the insect. Repeat weekly for 4 weeks because Ficus scale crawlers hatch in waves and the trunk hides them well.

Option 3

Horticultural oil spray, every 7 days for 4 weeks

Spray horticultural oil (Bonide All Seasons, ~$15) over every leaf surface, the petiole joints, and the full trunk. Smothers crawlers and adults under their seal. The waxy leaf cuticle on rubber plant tolerates oil well. Apply at lights-out, every 7 days for 4 weeks.

Mealybugs

Damage

High

Removal

Hard

What it looks like

Soft white insects covered in cottony fluff, 2 to 4 mm long. Cluster where the petiole meets the trunk, tucked under the reddish bud sheath (stipule) at the growing tip, and along the central trunk where leaves have dropped. Slow-moving and easy to miss in those tight pockets.

What the damage looks like

White cottony tufts visible at every leaf-petiole joint and around the protective sheath at the growing tip. A sticky shiny film on lower leaves and the pot rim. New leaves emerge stunted, off-color, or fail to unfurl from the bud sheath at all.

How to get rid of them

Option 1

Cotton swab dipped in 70% isopropyl alcohol

Dab every visible mealybug. The alcohol melts the waxy coating and kills on contact. Pay special attention to the leaf-petiole joints and gently lift the reddish stipule at the growing tip to reach colonies hidden underneath. Repeat every 3 days for 3 weeks to catch newly hatched eggs.

Option 2

Insecticidal soap + neem oil rotation, 4 weeks

Spray ready-to-use insecticidal soap on the underside of leaves and into every petiole joint at lights-out. Alternate weekly with neem oil. Continue 4 weeks because mealybug eggs hatch in protected joint pockets over time and need ongoing pressure. Rubber plant's thick cuticle handles both products.

Option 3

Isolate the plant from your collection

Move the rubber plant at least 6 feet from other houseplants. Mealybugs spread by crawling. Wipe nearby pots, the windowsill, and any tools that touched the infested plant. Ficus species share mealybug strains easily with monstera, fiddle leaf fig, and other tropicals.

Common myth

Stronger alcohol kills mealybugs faster.

95%+ alcohol evaporates faster than it can kill the bug. On rubber plant's glossy waxy leaves the higher concentrations leave dull dry patches that take months to grow out. Stick with 70%.

Spider mites

Damage

Medium

Removal

Moderate

What it looks like

Almost invisible without a hand lens. Yellow-green to red-orange specks running along the underside of leaves, especially near the central vein. Indoor heated air through winter dries the rubber plant's broad waxy leaves and triggers a fast population boom.

What the damage looks like

The glossy leaves visibly lose their shine and bronze across the upper surface, most obvious because rubber plant leaves are normally so reflective. Fine webbing strung along the leaf-petiole joint. Heavy infestations cause leaf drop from the lower trunk up.

How to get rid of them

Option 1

Wipe and shower the leaves weekly for 3 weeks

Wipe each leaf top and bottom with a damp microfiber cloth. Rubber plant's smooth waxy leaves take a hard wipe well and most mites come off on the cloth.

Move the plant to the shower or sink and spray cool water on the underside of every leaf for 30 seconds.

Repeat weekly for 3 weeks. Mites can't reattach quickly when knocked off, and the rinse humidity slows survivors.

Option 2

Neem oil at lights-out, every 5 days for 3 rounds

Mix 2 tablespoons cold-pressed neem oil and 1 teaspoon dish soap per gallon of water.

Spray top and bottom of every leaf at lights-out, paying special attention to the leaf-petiole joint where mites cluster.

Repeat every 5 days for 3 rounds. That covers the full egg-to-adult cycle.

Option 3

Run a humidifier through winter heating season

Aim for 50 to 60% relative humidity near the plant. Forced-air heating drops indoor humidity below 30% in winter, which is the climate spider mites need to breed fast. Rubber plant is happy at higher humidity anyway.

Thrips

Damage

Medium

Removal

Hard

What it looks like

Slender dark insects 1 to 2 mm long. Walk along leaves rather than fly. Hide in the leaf-petiole joints and tucked under the reddish bud sheath at the growing tip, where new leaves emerge. Easiest to spot by tapping a leaf over a sheet of white paper.

What the damage looks like

Silver or bronze streaks on the upper leaf surface, very visible against rubber plant's glossy finish, with tiny black dots (thrips droppings) alongside. New leaves emerge distorted, scarred, or fail to unfurl cleanly from the bud sheath. Leaf damage is permanent because rubber plant grows slowly.

How to get rid of them

Option 1

Blue sticky traps at canopy height

Hang blue sticky cards (Stikem or Trappify, ~$10 per pack) just above the leafy canopy. Thrips are attracted to blue and stick on contact. Replace every 2 weeks. Won't eliminate alone but reduces the population while spray treatment runs.

Option 2

Spinosad spray, weekly for 3 weeks

Spinosad (Captain Jack's or Monterey Garden Insect Spray, ~$12 to $15) is the most effective home treatment. Spray every leaf surface, into the petiole joints, and around the reddish bud sheath at the growing tip at lights-out. Repeat weekly for 3 weeks to break the life cycle.

Option 3

Wipe leaves with a damp cloth between sprays

Rubber plant's smooth waxy leaves take a hard wipe well, and a weekly wipe between spinosad rounds physically removes adults and eggs from leaf surfaces. The glossy cuticle isn't damaged by firm wiping. Use a clean microfiber cloth and rinse it between leaves so you don't spread thrips around the plant.

Stay ahead of all of them

Four habits that keep rubber plant pests rare and easy to catch.

Trunk and joint check, every Sunday

Scale and mealybugs both colonize the woody trunk and the leaf-petiole joints. Run a finger up the trunk and check every petiole. A weekly 30-second scan catches Ficus scale outbreaks while they're still small.

Quarantine new houseplants for 2 weeks

Ficus species pick up scale and mealybugs at nearly every retail step. Two weeks of isolation away from your other plants catches anything before it spreads. New rubber plants are especially worth quarantining because Ficus scale is hard to clear once established.

Wipe the glossy leaves monthly

The thick waxy leaves take a damp microfiber cloth without complaint and clean up beautifully. The wipe catches dust, early spider mite specks, and scale crawlers before they multiply. Skip leaf-shine sprays. A damp cloth is all the rubber plant needs.

Move it away from heat vents in winter

Forced-air heat blasts the broad leaves with dry air, which is the climate spider mites need to explode. Keeping the rubber plant a few feet from the nearest vent, paired with a humidifier nearby, prevents the winter mite outbreak that hits most indoor Ficus.

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About This Article

Kiersten Rankel M.S.

Botanical Data Lead at Greg · Plant Scientist

About the Author

Kiersten Rankel holds an M.S. in Ecology & Evolutionary Biology from Tulane University. A certified Louisiana Master Naturalist, she has over a decade of experience in science communication, with research spanning corals, cypress trees, marsh grasses, and more. At Greg, she curates species data and verifies care recommendations against botanical research.

See Kiersten Rankel's full background on LinkedIn.

Editorial Process

Pest identification and treatment guidance verified against Ficus elastica field reports from Greg's botanical database, cross-referenced with university extension sources and published horticultural research.

33,673+ Greg users growing this plant

USDA hardiness zones 10a–11b

Citations:
NC State Extension
Missouri Botanical Garden
Clemson Cooperative Extension
Scale photo: Whitney Cranshaw, Bugwood.org (CC BY 3.0 US)
Mealybug photo: Gianni Del Bufalo (CC BY 2.0)
Spider mite photo: Clemson University - USDA Cooperative Extension, Bugwood.org (CC BY 3.0 US)
Thrips photo: Ryan Hodnett (CC BY-SA 4.0)