What's Eating Your Jade?

Crassula ovata

Reviewed by Kiersten Rankel M.S.

Quick Answer

For jade, the most likely culprits are mealybugs (white cottony tufts wedged in the leaf-stem joints, and sometimes on the roots themselves) and scale insects (small oval brown bumps stuck to the smooth leaves and woody stems). Spider mites show up in dry winter heat. Fungus gnats are a warning sign that the soil is staying too wet for jade.

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What does the damage look like?

Tap the closest match to jump straight to the fix.

White cottony tufts in leaf joints

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Brown bumps on leaves and stems

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Tiny pale dots and fine webs

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Tiny black flies near the soil

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Pests, ranked by impact

Mealybugs

Damage

High

Removal

Hard

What it looks like

Soft white insects 2 to 4 mm long, coated in cottony fluff. Wedge into the leaf-stem joints where new pairs of leaves emerge, deep in the rosette of new growth at branch tips, and along the woody trunk. A second form, root mealybugs, lives below the soil line on the roots and looks like white powder or fluff on the rhizome.

What the damage looks like

White cotton in every leaf-stem joint and a sticky shiny film on the leaves below. Leaves yellow and drop from the affected branch, often the youngest leaves first. If the plant slowly fails despite no visible bugs above the soil, root mealybugs are the usual cause and only show up when you slip the rootball out of the pot.

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. Pull the leaf-stem joints apart gently with a toothpick to reach colonies hiding where new leaves emerge. Repeat every 3 days for 3 weeks. Jade's thick waxy leaves tolerate the alcohol well, but avoid full-leaf wipes in direct sun the same day.

Option 2

Inspect the roots and repot if needed

Slip the jade out of its pot and brush the soil off the rootball.

Look for white powdery fluff or cottony patches on the roots and where the roots meet the stem. That is root mealybugs.

If found, rinse the roots clean under running water, trim any mushy roots, and repot in fresh dry succulent mix in a clean pot. Toss the old soil.

Soak the rootball in a 70% alcohol and water solution (1 part alcohol to 3 parts water) for 10 minutes before repotting if the infestation is heavy.

Option 3

Isolate the plant from your collection

Move the jade at least 6 feet from other houseplants. Mealybugs spread by crawling between touching pots and leaves. Wipe the windowsill, the saucer, and any tools or hands that touched the infested plant.

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

Scale insects

Damage

Medium

Removal

Moderate

What it looks like

Small oval brown or tan bumps, 1 to 3 mm wide, glued to the smooth waxy leaves and along the woody trunk and branches. Look like tiny barnacles. Easy to spot on jade because the bumps stand out against the matte green leaf and the bark.

What the damage looks like

Yellow halos around each cluster of bumps on the leaves. A sticky shiny film on lower leaves and the pot rim, sometimes turning into black sooty mold. Heavy infestations cause leaf drop along whole branches over a few months. The plant slows and stops pushing new growth at the affected stem tips.

How to get rid of them

Option 1

Scrape and dab with alcohol, weekly for 3 weeks

Scrape every visible bump off with a fingernail or soft toothbrush. Jade's waxy leaves and woody bark take the scraping well.

Dab any remaining bumps with a cotton swab dipped in 70% isopropyl alcohol to penetrate the waxy seal.

Repeat weekly for 3 weeks to catch newly hatched crawlers before they form their own shells.

Option 2

Horticultural oil spray, weekly for 3 weeks

Spray horticultural oil (Bonide All Seasons, ~$15) on every leaf, the leaf-stem joints, and the woody branches. Smothers crawlers and adults. Apply at lights-out, every 7 days for 3 weeks. Let the plant dry overnight before any direct sun.

Spider mites

Damage

Medium

Removal

Moderate

What it looks like

Almost invisible without a hand lens. Yellow-green to red specks on the underside of leaves and where leaves meet the stem. Less common on jade than on thinner-leaved houseplants because the waxy leaf cuticle slows feeding, but winter heating that dries indoor air can still trigger a population boom.

What the damage looks like

Pale tiny pale dots on the upper leaf surface, often visible as a faint dusty look across an otherwise glossy leaf. Fine webbing strung between the leaf-stem joints in heavier infestations. Affected leaves turn dull, then bronze, then drop. Damage starts at the youngest leaves at branch tips.

How to get rid of them

Option 1

Shower the leaves and let dry fully

Move the jade to the sink or shower. Spray cool water on the underside of every leaf and into the leaf-stem joints for 30 seconds. Let the plant drain completely and dry overnight in good airflow before returning it to its spot. Repeat weekly for 3 weeks. Jade's waxy leaves shrug off the rinse but cannot sit wet.

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 attention to the leaf-stem joints where mites cluster.

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

Option 3

Move the plant out of dry heated air

Spider mites breed fast in hot dry winter air near heating vents. Move the jade to a cooler, less dry spot for the winter, or run a small humidifier in the room at 40% relative humidity. Jade does not need humidity, but mites need dry air to thrive.

Fungus gnats

Damage

Medium

Removal

Easy

What it looks like

Tiny dark flies, 1 to 3 mm long, hovering near the soil and flying up when you water or brush the plant. Larvae are barely-visible white worms in the top inch of damp soil.

What the damage looks like

Adults are mostly a nuisance, but on jade their presence is a serious warning. Fungus gnats only thrive in damp soil, the same conditions that cause jade root rot. Jade roots rot fast in wet soil and the plant collapses from the roots up, often before the leaves show any sign.

How to get rid of them

Option 1

Stop watering until the soil is bone dry

Do not water for at least 2 to 3 weeks, or until the pot feels light and the soil is dry all the way down. Larvae cannot survive in dry soil and adults stop laying eggs. Jade stores water in its leaves and is fine being underwatered for weeks. Resume watering only when the leaves start to feel soft, then water deeply once and let it dry out fully again.

Option 2

Yellow sticky traps near the soil

Stick yellow cards (Trappify, ~$10) just above the soil surface. Adults stick to them on takeoff and landing. Catches the breeding population while the dry-out kills the larvae.

Option 3

Top-dress with coarse grit or sand

Add a half-inch layer of coarse aquarium gravel or chicken grit on top of the soil. The dry layer keeps adults from reaching the soil to lay eggs and helps the surface dry faster between waterings, which jade wants anyway.

Common myth

Drench the soil with hydrogen peroxide.

It kills larvae but also kills the beneficial soil microbes jade roots rely on. Worse, drenching contradicts the real fix: letting the soil dry out completely. A hydrogen peroxide drench keeps the soil wet for hours, which is exactly the condition that rots jade roots in the first place.

Stay ahead of all of them

Four habits that keep jade pests rare and easy to catch.

Joint and trunk check, every Sunday

Mealybugs and scale both hide in the leaf-stem joints and along the woody trunk and branches. A weekly 30-second scan catches them while colonies are small and a cotton swab still clears them in one round.

Quarantine new plants for 2 weeks

Mealybugs and scale travel home from the nursery on the plant you bought. Two weeks of isolation away from your other succulents catches anything before it spreads, and root mealybugs especially are easier to deal with on a single plant than after they jump pots.

Let the pot dry completely between waterings

Jade evolved on dry South African hillsides and stores water in its leaves. Watering only when the soil is bone dry and the leaves start to soften kills fungus gnat larvae before they hatch and stops the root rot that takes more jade plants than any pest.

Repot in fresh succulent mix every 2 to 3 years

Old soil compacts and stays wetter for longer, which invites both root mealybugs and root rot. A fresh gritty succulent mix every couple of years lets you also inspect the rhizome for early root mealybug fluff while you have the plant out of the pot.

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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 Crassula ovata field reports from Greg's botanical database, cross-referenced with university extension sources and published horticultural research.

60,133+ Greg users growing this plant

USDA hardiness zones 9b–12b

Citations:
NC State Extension
Mealybug photo: Gianni Del Bufalo (CC BY 2.0)
Spider mite photo: Clemson University - USDA Cooperative Extension, Bugwood.org (CC BY 3.0 US)
Fungus gnat photo: B. Schoenmakers (CC BY 3.0)
Scale photo: Whitney Cranshaw, Bugwood.org (CC BY 3.0 US)