ZZ plant pests, webbing or sticky leaves: causes and what to do
6 results in the diagnosis tree begin with pests, 5 of them marked likely when the answers fit. They are ordered here for ZZ plant (Zamioculcas zamiifolia), using what its sources say about pests and diseases, humidity and watering and one problem recorded for it.
Sources last read 18 September 2026.
Zamioculcas is a genus of flowering plants in the family Araceae, containing the single species Zamioculcas zamiifolia. It is a tropical herbaceous perennial plant, and is native to eastern Africa, including Kenya, KwaZulu-Natal, Malawi, Mozambique, Tanzania, and Zimbabwe. Wikipedia, CC BY-SA 4.0
Native range: Kenya to KwaZulu-Natal (seasonally dry tropical). Also sold as Aroid Palm, Emerald Palm, Eternity Plant, fern arum, Zanzibar Gem and Zuzu Plant.
What ZZ plant’s sources say that bears on this
- Pests and diseases
- Can be troubled by armored scale.NC State Extension · read 13 September 2026Usually free of pests and diseases.RHS · read 13 September 2026
- Humidity
- Most foliage plants prefer more humidity than a heated room gives; succulents are named as an exceptionPenn State Extension · read 11 September 2026
- Watering
- Its swollen, fleshy rhizomes produce glossy leaves that hold water, making it very drought tolerant. Indoors, use a well-drained potting soil, water on a routine, and let it dry between waterings, since it does not tolerate wet feet.NC State Extension · read 13 September 2026
How this shows up on a ZZ plant
Sticky leaves and immobile shell-like insects on the stems
The ZZ plant is sticky to the touch and yellows slowly. Along the veins on the undersides sit small shell-like scales that lift off with a fingernail.
NC State Extension lists scale insects among the pests it may attract. The insect settles under a waxy shell and feeds on sap for life, so a colony builds quietly along the stems.
Telling it apart: Whether the bumps sit on the veins. Scale follows the sap; spots from disease scatter across the leaf.
NC State Extension · read 13 September 2026Possible causes, likeliest first for a ZZ plant
Most likely scale insects
Ranked higher because ZZ plant's recorded problems point this way.
- Sticky leaves and immobile shell-like insects on the stems NC State Extension
Why: Scale insects settle in one place under a hard or waxy shell and feed on sap.
What to try:
- Move the zz plant away from other plants.
- Scrape the scales off with a fingernail or a soft brush, then wipe the stems and leaves.
What would settle it: Push a bump gently with a fingernail. Scale comes away and leaves a mark; a bump that is part of the zz plant does not move.
Most likely fungus gnats, which point at wet potting mix
Ranked higher for ZZ plant because of what its sources say.
ZZ plant stores water in its own tissue, which makes it more sensitive to wet soil than most leafy plants, so this reading is stronger for it.
- Well-drained RHS · read 11 September 2026
- Loam, Sand; pH Acid or Alkaline or Neutral RHS · read 11 September 2026
Why: Fungus gnats lay their eggs in moist potting mix, and their larvae feed on organic matter and fungi in it.
What to try:
- Let the top two inches of potting mix dry between waterings; the larvae need it wet.Useful: moisture meter
- Yellow sticky traps near the soil catch the adults and show whether the numbers fall.Useful: sticky traps
What would settle it: Put a slice of raw potato on the soil for a day. Tiny translucent larvae on the underside confirm them.
Most likely spider mites
Why: Spider mites feed on individual leaf cells, and each emptied cell shows as a pale speck.
What to try:
- Move the zz plant away from other plants.
- Wash the leaves, top and underside, with a strong spray of water in a shower or sink.
What would settle it: Hold a sheet of white paper under a leaf and tap the leaf. Tiny specks that move across the paper are mites.
Less likely for a ZZ plant, still possible
Questions
- What usually causes pests on a ZZ plant?
- For ZZ plant: scale insects, fungus gnats and spider mites.
- How can I tell which one it is on my ZZ plant?
- What can you see? Fine webbing, and tiny pale speckles on the leaves; White, cottony tufts in the leaf joints; Small brown or pale bumps on stems and leaves that do not move; Clusters of small, soft insects on the new growth; Tiny dark flies around the soil; Sticky, shiny residue, but no insect I can see.
- What do ZZ plant's sources say about its pests and diseases?
- NC State Extension: Can be troubled by armored scale. RHS: Usually free of pests and diseases.
- What does this look like on a ZZ plant?
- The ZZ plant is sticky to the touch and yellows slowly. Along the veins on the undersides sit small shell-like scales that lift off with a fingernail. Telling it apart: Whether the bumps sit on the veins. Scale follows the sap; spots from disease scatter across the leaf.
- Is ZZ plant safe to handle while I check it?
- Its sources list it as toxic to people. Wash your hands after handling the roots or sap, and keep trimmings away from pets.
Other plants that show pests
AlocasiaFine pale speckling on the leaves, then webbing at the tips: spider mites
Arrowhead plantCurled, sticky new leaf blades with green or black insects: aphids
Dumb caneHard, rounded scale on the undersides of the leaves
Elephant earClusters of small soft insects on the shoot tips and buds: aphids
Heartleaf philodendronPale stippled leaves and tiny moving dots underneath: a mite pest
Lacy tree philodendronFine pale speckling on the leaf blades, then webbing at the tips: spider mites
Something else wrong with the ZZ plant?
What this does not cover
This page orders a decision tree's results using a plant's sourced care. It has not seen your plant, its pot or its window, and two problems at once are common: that is the usual reason a confident answer turns out wrong. The questions in the diagnosis tool narrow it further than a list can.